All Calculators

EMI Calculator

Estimate your monthly loan repayment, total interest and full amortization schedule — the standard way loan repayments are structured across mortgages, auto loans, and personal loans.

GST Calculator

Add or remove GST from an amount, either direction, instantly — handling the inclusive and exclusive calculation correctly, which trips up many manual attempts.

Mortgage Payment Calculator (PITI)

Find your full monthly mortgage payment — principal, interest, property tax, home insurance, PMI and HOA combined — plus a complete amortization schedule.

Mortgage Affordability Calculator

Find the maximum home price you can afford, based on your income, existing debts, down payment and a target debt-to-income ratio.

Investment Growth Calculator

See how a starting investment plus regular monthly contributions grows over time — the single most useful number for planning any long-term investing goal.

Compound Interest Calculator

See how your money grows when interest compounds instead of staying simple — the mathematical engine behind essentially all long-term investment growth.

Auto Loan Calculator

Find your monthly car payment including trade-in value and sales tax, with a full amortization schedule.

Retirement Savings Calculator

See how much your monthly retirement contributions could grow to — projecting a critical, decades-long compounding process most people underestimate.

Mortgage Refinance Calculator

Compare your current mortgage against a refinance offer to find your monthly savings, break-even point, and total interest difference.

Take-Home Pay Calculator

Estimate your net monthly pay after tax and other deductions — a practical bridge between a headline salary figure and the amount that actually reaches your bank account.

Debt Snowball vs Avalanche Calculator

Simulate paying off up to three debts using the snowball method (smallest balance first) versus the avalanche method (highest rate first), with the same extra budget.

Discount Calculator

Find the sale price and how much you save on any discount — a quick, everyday calculation for shopping and pricing decisions.

Investment Fee Impact Calculator

See exactly how much a fund's expense ratio costs in real dollars over a long investing horizon — a fee that looks tiny annually compounds into a genuinely large number.

Currency Converter

Convert an amount using any exchange rate you enter — a flexible manual conversion tool for whatever rate you have available.

Rent vs Buy Calculator

Compare the true net cost of buying versus renting over a chosen number of years, including home appreciation, equity, taxes, maintenance and selling costs.

SIP Step-Up Calculator

Model a systematic investment plan where your monthly contribution increases every year — a more realistic projection than assuming a flat contribution for decades.

Dollar-Cost Averaging vs. Lump Sum Calculator

Compare investing a windfall all at once against spreading it out in equal monthly amounts — under a steady assumed return, one of these has a built-in mathematical edge.

Loan Eligibility Calculator

Estimate the maximum loan amount you could qualify for, based on your income — working backward from a lender's typical debt-to-income constraint.

Dividend Reinvestment (DRIP) Calculator

See exactly how much reinvesting dividends into more shares — instead of taking them as cash — adds to a stock position's long-run value.

Profit Margin Calculator

Find your profit margin percentage from revenue and cost — a core business health metric measuring how much of each sales dollar is actually kept as profit.

Debt Consolidation Calculator

Compare your combined current monthly debt payments against a single consolidation loan, to see the real monthly savings.

Real Rate of Return Calculator

Find out what an investment's return is actually worth after inflation — the number that determines whether your money's real purchasing power grew at all.

ROI Calculator

Find the return on investment percentage for any gain and cost — a universal, simple metric for judging investment performance, with one important blind spot worth understanding.

Asset Allocation Calculator

Find a portfolio's blended expected return from its mix of stocks, bonds and cash — the single number a stock/bond split is really deciding.

Extra Mortgage Payment Calculator

See exactly how much time and interest a fixed extra monthly payment saves on your mortgage, with a full accelerated amortization schedule.

Cost of Waiting to Invest Calculator

See exactly what delaying the start of a monthly investing habit costs by the time your original horizon ends — a real number for a genuinely common form of procrastination.

Credit Card Payoff Calculator

Find out how many months it takes to pay off a credit card balance — and see exactly why paying only the minimum can trap a balance in place indefinitely.

Student Loan Calculator (With Grace Period)

Find your student loan payment accounting for interest that accrues and capitalizes during a grace or deferment period before repayment begins.

Freelance Rate Calculator

Find the hourly rate you need to charge to hit your income target — accounting for the reality that freelancers rarely bill 100% of their working hours.

PMI (Private Mortgage Insurance) Calculator

Estimate your monthly private mortgage insurance cost and the loan balance at which it can typically be removed.

Simple Interest Calculator

Calculate simple interest and the total amount owed or earned — the more straightforward, linear counterpart to compound interest.

Taxable vs. Tax-Advantaged Account Calculator

See exactly how much annual tax drag costs a growing investment over decades — the specific advantage a 401(k), IRA, or similar tax-advantaged account has over an ordinary taxable brokerage account.

Personal Loan Calculator (With Origination Fee)

Find your true personal loan cost — the origination fee is deducted from what you receive, but you repay it on top of the full loan amount.

Hourly to Salary Calculator

Convert an hourly wage into equivalent annual, monthly and weekly pay — a straightforward but genuinely useful conversion for comparing job offers and understanding true earning potential.

Loan Comparison Calculator (Two Offers)

Compare two loan offers side by side — different rates, different terms — to see which one actually costs less.

Sales Tax Calculator

Add sales tax to a price and see the total you'll pay — a simple, universal calculation across any percentage-based consumption tax.

Home Equity Loan / HELOC Calculator

Find your available home equity and how much you could borrow against it, based on your home's value, mortgage balance, and lender's maximum loan-to-value ratio.

Net Worth Calculator

Add up what you own and subtract what you owe to find your net worth — a single, honest snapshot of overall financial position.

Biweekly Mortgage Payment Calculator

See how switching to biweekly payments — half your monthly payment every two weeks — pays off your mortgage years sooner, without a large extra payment.

Loan Payoff Time Calculator

Find how many months it takes to pay off a loan at a fixed monthly payment you choose — the reverse of a standard loan calculator.

APR vs Interest Rate Calculator

See why a loan's APR runs higher than its stated interest rate once upfront fees are spread across the loan's balance and term.

Inflation Calculator

See what today's money will be worth in the future after inflation — and understand why a fixed sum feels smaller and smaller the longer it sits unused.

Mortgage Points Calculator

Find whether buying mortgage discount points to lower your rate is worth it, based on the points cost, monthly savings, and how long you'll keep the loan.

Required Rate of Return Calculator

Work backward from a savings goal to find the annual return your investment would actually need to earn to get there — and see if that number is realistic.

Savings Goal Calculator

Find out how much to save each month to hit your target on time — turning a fuzzy savings aspiration into a concrete, actionable monthly number.

Overtime Pay Calculator

Find your total pay including overtime at a premium rate — the standard structure for compensating hours worked beyond a normal threshold.

ARM vs Fixed-Rate Mortgage Calculator

Compare an adjustable-rate mortgage's intro-period payment and post-adjustment payment against a fixed-rate mortgage on the same loan.

Markup Calculator

Find the selling price and profit from a cost and a markup percentage — a foundational pricing calculation, easy to confuse with the related but distinct concept of profit margin.

Debt-to-Income Ratio Calculator

Find your debt-to-income ratio, a key number lenders use to assess borrowing capacity — and a genuinely useful personal check on how much of your income is already committed to debt.

Balloon Loan Calculator

Find the lower regular payment a balloon loan offers, and the size of the large lump-sum payment due when it matures early.

Rule of 72 Calculator

Estimate how many years it takes an investment to double at a given rate — a genuinely useful mental-math shortcut that predates calculators.

Break-Even Point Calculator

Find out how many units you need to sell before you start turning a profit — a foundational check for pricing and business viability decisions.

Prepayment Penalty Calculator

Compare the interest you'd save by paying off a loan early against the prepayment penalty it would cost, to see if early payoff is actually worth it.

Tip Calculator

Work out the tip and split the bill fairly among your group — a fast, everyday calculation for dining out or any shared expense.

Annuity Calculator

Find the lump sum needed today to generate a fixed monthly payment — the reverse of a typical savings projection.

Depreciation Calculator

Find the annual depreciation and current book value of an asset — the straight-line method's simple way of spreading purchase cost across an asset's useful life.

Math

Percentage Calculator

Find what a percentage of a number is, instantly — the most fundamental everyday percentage calculation.

CAGR Calculator

Find the compound annual growth rate between a starting and ending value — a single, comparable annualized figure for evaluating growth over any time period.

Pythagorean Theorem Calculator with Steps

Find any missing side of a right triangle — hypotenuse or leg — from the other two, using a² + b² = c².

Fraction Calculator with Mixed Numbers

Add, subtract, multiply or divide two fractions or mixed numbers — fully simplified, shown as both an improper fraction and a mixed number.

Simultaneous Equation Solver with Steps

Solve a system of two linear equations with two unknowns using Cramer's rule — every determinant shown alongside the final x and y.

Percentage Change Calculator

Find the percentage increase or decrease between two numbers — a relative measure of change that's more meaningful than the raw difference alone.

Quadratic Formula Calculator with Graph

Solve ax² + bx + c = 0 and see the actual parabola plotted — roots, vertex, axis of symmetry and y-intercept, all from one graph.

Bayes Theorem Calculator with Examples

Update a probability based on new evidence — Bayes' theorem, the mathematical foundation behind medical testing, spam filters, and every 'given what we now know' probability question.

Derivative Calculator

Find the derivative of any function at a specific point — computed numerically from the actual definition of a derivative, with the step-by-step working shown.

Average Calculator

Find the average (mean) of up to five numbers — the most common single-number summary of a data set.

Gaussian Elimination Calculator with Steps

Solve a 3×3 system of linear equations via Gaussian elimination — watch each row operation reduce the system down to a direct answer.

Binomial Probability Calculator with Explanation

Find the probability of exactly k successes in n independent trials — the binomial distribution, the foundation for coin-flip, quality-control and A/B-test probability questions.

Integral Calculator with Limits and Graph

Compute a definite integral between two limits — the exact area under any curve — with the function plotted alongside the result.

Standard Deviation Calculator with Work

Find the mean, variance and standard deviation of any dataset, with every intermediate step shown — population or sample formula, your choice.

Confidence Interval Calculator from Sample Data

Find the confidence interval for a population mean from your sample's mean, standard deviation and size — with a genuine margin of error, not just a single estimate.

Quadratic Equation Calculator

Solve ax² + bx + c = 0 for its real roots, instantly — using the quadratic formula, one of algebra's most foundational tools.

Circle Calculator

Find the area and circumference of a circle from its radius — the two foundational measurements for any circular shape.

Law of Cosines Calculator for Triangles

Find a triangle's third side from two sides and the included angle — the Law of Cosines, generalizing the Pythagorean theorem to any triangle.

Completing the Square Calculator

Rewrite ax² + bx + c = 0 as a perfect square (x + p)² = q, step by step — the technique behind the quadratic formula itself.

Triangle Area Calculator

Find a triangle's area from its three side lengths, using Heron's formula — no angle or height measurement required.

Circle Area Calculator Using Diameter

Find a circle's area directly from its diameter — no need to halve it to a radius first.

Matrix Inverse Calculator (3x3)

Find the inverse of any 3×3 matrix, computed via the determinant and adjugate — the same cofactor-expansion method taught in a first linear algebra course.

Slope Calculator

Find the slope of a line between two points — the fundamental measure of steepness and direction in coordinate geometry.

Surface Area of Cylinder Calculator

Find a cylinder's total surface area — both circular ends plus the curved side — from its radius and height.

Distance Between Two Points Calculator

Find the straight-line distance between two points on a plane — a direct application of the Pythagorean theorem to coordinate geometry.

Polynomial Long Division Calculator

Divide one polynomial by another and get the quotient and remainder directly — the same long division process as arithmetic, applied to algebraic expressions.

Ratio to Percentage Calculator

Convert a ratio like 3:2 into the percentage share of each part — turning a comparative ratio into intuitive percentage figures.

Percentage Error Calculator

Find the percentage error between a measured and an actual value — a standard way to express how far an estimate or measurement is from the true figure.

Logarithm Calculator

Find the logarithm of a number to any base — the mathematical inverse of exponentiation, used across science, engineering, and finance.

Eigenvalue Calculator (3x3 Symmetric Matrix)

Find the eigenvalues of a symmetric 3×3 matrix using the Jacobi rotation method — a reliable numeric algorithm guaranteed to converge to real eigenvalues.

Exponent Calculator

Raise any number to any power, including negative and fractional exponents — the core operation behind exponential growth, scientific notation, and compound calculations.

Root Calculator

Find the nth root of any positive number — the mathematical inverse of exponentiation, covering square roots, cube roots, and beyond.

Sphere Volume Calculator

Find the volume and surface area of a sphere from its radius — the fundamental three-dimensional measurements for any spherical object.

Cylinder Volume Calculator

Find the volume of a cylinder from its radius and height — a common calculation for tanks, pipes, and cylindrical containers.

Geometric Mean Calculator

Find the geometric mean of two or three numbers — the correct way to average ratios, percentages, and growth rates.

IT & Developer

JSON Formatter

Pretty-print and validate JSON, entirely in your browser.

Password Strength Checker

Check a password's strength based on its length and character variety.

JWT Decoder

Decode a JWT's header and payload — entirely in your browser, without verifying its signature.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text, entirely in your browser — a foundational tool for safely embedding binary data in text-based formats.

Unix Timestamp Converter

Convert a Unix timestamp into a readable UTC date and time.

Binary Calculator

Convert a decimal number to binary, octal and hexadecimal — revealing the different number-base systems computers and programmers use for the same underlying value.

Uptime / SLA Calculator

Convert an uptime percentage (SLA) into allowed downtime per year and month.

Password Entropy Calculator

Measure password strength in bits of entropy from length and character set.

URL Encoder / Decoder

Percent-encode text for safe use in a URL, or decode a percent-encoded string back to plain text.

Hex Calculator

Convert a hexadecimal value to decimal, binary and octal.

RAID Calculator

Find usable storage capacity for a RAID array from disk count, disk size and RAID level.

ASCII Converter

Convert text to character codes, or character codes back to text — revealing the numeric foundation underlying all digital text representation.

Aspect Ratio Calculator

Scale a resolution to a new width while keeping the same aspect ratio — avoiding the stretched or squashed look of an improperly resized image or video.

Download Time Calculator

Estimate how long a file takes to download at a given connection speed.

XML Formatter

Re-indent XML into a readable, nested format.

File Download Time Calculator

Estimate how long a file takes to download at a given connection speed.

Reading Time Calculator

Estimate how long an article or document takes to read from its word count.

Cloud Server Cost Calculator

Estimate the monthly cost of an hourly-billed cloud server — the standard pricing convention across most major cloud computing providers.

Data Storage Converter

Convert between bytes, kilobytes, megabytes, gigabytes and terabytes — using the binary-based scaling convention computers actually use internally.

Screen DPI Calculator

Find a screen's pixel density (PPI) from its resolution and diagonal size.

Megapixel Calculator

Find the total megapixels of an image or camera sensor from its resolution.

API Rate Limit Calculator

Convert an API rate limit into requests per second and per day — normalizing different limit conventions into one comparable figure.

Downtime Cost Calculator

Estimate the revenue lost during a service outage.

UTF-8 Byte Converter

See the raw UTF-8 byte sequence for any text, including multi-byte characters like emoji.

Typing Speed (WPM) Calculator

Find your typing speed in words per minute from characters typed and time taken.

API Cost Calculator

Estimate the monthly cost of a pay-per-call API from your expected call volume — a foundational check before committing to a usage-based service.

Video Bitrate Calculator

Find the bitrate needed to hit a target file size for a given video length.

Page Weight Budget Calculator

Find the maximum page size that still loads within a target time on a given connection.

Frame Time Calculator

Convert a frame rate (FPS) into the time budget per frame, in milliseconds.

Compression Ratio Calculator

Find the compression ratio and space saved between an original and compressed file size — a quick way to gauge how effectively a specific compression method actually worked.

Cron Job Frequency Calculator

Find how many times a scheduled job runs per day and per month from its interval — a quick way to estimate log volume, API usage, or billing impact for a recurring task.

Engineering

Ohm's Law Calculator

Find resistance and power from voltage and current using Ohm's Law — the single most foundational relationship in basic electrical circuit analysis.

Resistor Series/Parallel Calculator

Find the total resistance of two resistors in series or parallel — the two fundamental ways components combine in essentially every electrical circuit.

Kinetic Energy Calculator

Find the kinetic energy of a moving object from its mass and velocity — a relationship whose velocity-squared scaling explains why speed matters so much for collision severity.

Beam Deflection Calculator

Find the maximum deflection of a simply supported beam under a center point load — one of the most common checks in structural and mechanical design.

Three-Phase Power Calculator

Find real power delivered by a balanced three-phase electrical system — the standard configuration for higher-power industrial and commercial electrical loads.

Power Factor Calculator

Find the power factor of an electrical load from real and apparent power — a key efficiency metric for AC electrical systems, particularly relevant to commercial and industrial billing.

Bolt Torque Calculator

Estimate the tightening torque needed for a target bolt clamp force — the standard short-form relationship used across general mechanical fastening work.

Thermal Expansion Calculator

Find how much a material expands when heated, from its length and coefficient of thermal expansion — a key consideration for expansion joints in bridges, railways, and pipelines.

Fluid Flow Rate Calculator

Find the volumetric flow rate through a pipe from cross-sectional area and velocity — one of the most fundamental relationships in fluid mechanics and pipe sizing.

Gear Ratio Calculator

Find the gear ratio and output speed from two gears' tooth counts — the fundamental relationship governing how mechanical systems trade speed for torque.

Voltage Divider Calculator

Calculate the output voltage of a two-resistor voltage divider circuit — one of the most common and useful basic building blocks in electronics.

Horsepower to Watts Calculator

Convert between mechanical horsepower and watts — bridging the traditional imperial power unit with the SI standard used throughout modern science and engineering.

RC Charge Time Calculator

Find how long a resistor-capacitor circuit takes to charge to a given percentage — since a charging capacitor follows an exponential curve that mathematically never quite reaches 100%.

Force Calculator

Find force from mass and acceleration using Newton's second law — the foundational relationship connecting motion and the forces that cause it.

Reynolds Number Calculator

Find the Reynolds number for pipe flow to check whether it's laminar or turbulent — a single dimensionless number that predicts fundamentally different flow behavior.

Torque Calculator

Find torque from force and lever arm length — the rotational equivalent of force, and the basis for understanding leverage, gears, and rotating machinery.

Pressure Calculator

Find pressure from force and the area it's applied over — a relationship that explains everything from why snowshoes work to how hydraulic systems multiply force.

Capacitor Series/Parallel Calculator

Find the total capacitance of two capacitors in series or parallel — following a combination logic that runs exactly opposite to how resistors combine.

Inductor Energy Storage Calculator

Find the energy stored in an inductor's magnetic field — the electrical circuit analog to kinetic energy, following the same underlying mathematical structure.

Construction

Flooring Calculator

Estimate flooring area and cost, including a waste allowance — turning simple room dimensions into a realistic purchase quantity and budget.

Concrete Calculator

Estimate the concrete volume and number of bags needed for a slab — converting simple length, width, and depth measurements into an actionable material order.

Mulch Calculator

Find how many cubic yards of mulch you need to cover a garden bed — converting bed area and target depth into a purchasable material quantity.

Tile Calculator

Estimate how many tiles you need for a floor or wall — converting floor area and individual tile size into a purchasable unit count with waste allowance.

Brick Calculator

Estimate how many bricks you need for a wall — a straightforward area-based calculation that scales with your specific brick size and coursing pattern.

Drywall Calculator

Find how many drywall sheets you need for a given wall or ceiling area — a simple coverage calculation across the three common sheet sizes.

Roofing Calculator

Estimate roof surface area from footprint dimensions and roof pitch — since a pitched roof always has more surface area than its flat footprint suggests.

Stud Spacing Calculator

Find how many wall studs you need for a given wall length and spacing — a foundational framing calculation built around the standard 'on center' spacing convention.

Fence Calculator

Estimate the posts and panels needed for a fence — using the simple but easily-miscounted relationship between fence length, post spacing, and post count.

Paint Calculator

Estimate how much paint you'll need for a wall, accounting for doors and windows — turning simple wall measurements into a realistic purchase quantity.

Paver Calculator

Find how many pavers you need for a patio or walkway, including a waste allowance — converting area and paver size into a purchasable unit count.

Stair Calculator

Find the number of steps and exact riser height for a staircase — solving the practical problem of dividing a fixed total rise into equal, code-compliant steps.

Topsoil Calculator

Find how many cubic yards of topsoil you need to fill or level an area — converting area and target depth into a supplier-ready order quantity.

Deck Board Calculator

Find how many deck boards you need for a given deck area — accounting for board coverage and a realistic waste allowance for cuts and staggered seams.

Asphalt Calculator

Estimate the tonnage of asphalt needed for a driveway or paving project — since asphalt is ordered by weight, not area or volume.

Gravel Calculator

Estimate the volume and weight of gravel needed for a path or driveway — converting simple area and depth measurements into an order quantity suppliers can actually fulfill.

Insulation R-Value Calculator

Find the total R-value of an insulation layer from its thickness and material — the key figure for verifying a wall, attic, or floor meets its thermal performance target.

Retaining Wall Block Calculator

Find how many blocks you need for a retaining wall from its length and height — a row-by-row calculation for straight, unbattered wall designs.

Wallpaper Calculator

Find how many wallpaper rolls you need for a room's wall area — using usable coverage per roll to account for pattern-matching waste.

Health

BMI Calculator

Check your Body Mass Index and see which healthy range you fall into — a quick, widely-used screening measure based on height and weight alone.

Calorie Calculator

Estimate your daily calorie needs based on your body and activity level — combining resting metabolism with an activity multiplier for a full daily target.

Calories Burned Calculator

Estimate calories burned during exercise using MET values — the standard exercise-science method for comparing energy cost across different activities.

Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy circumference method — a practical field estimate that needs only a tape measure.

BMR Calculator

Estimate the calories your body burns at rest, using the Mifflin-St Jeor formula — the foundation for calculating total daily calorie needs.

Pregnancy Due Date Calculator

Estimate your due date and current week of pregnancy from your last menstrual period — based on Naegele's rule, the standard obstetric estimation method.

Running Pace Calculator

Find your running pace per kilometer and average speed — the core numbers runners use to plan training and race strategy.

Macro Calculator

Split your daily calories into protein, carb and fat targets in grams — turning a percentage-based nutrition plan into concrete numbers you can track.

Water Intake Calculator

Estimate how much water to drink each day based on your weight and activity — a practical hydration target grounded in a commonly used weight-based guideline.

Protein Intake Calculator

Estimate your daily protein needs based on body weight and activity level — since protein requirements scale meaningfully with how active you are, not just how much you weigh.

Heart Rate Zone Calculator

Find your target heart rate zones for fat burning and cardio training — based on the widely-used 220-minus-age formula for estimating maximum heart rate.

Ideal Weight Calculator

Estimate a healthy reference weight for your height using the Devine formula — originally developed for medication dosing, now widely used as a general reference point.

Target Heart Rate Calculator (Karvonen)

Find your target training heart rate using the Karvonen method, which factors in resting heart rate for a more personalized zone than age alone.

Lean Body Mass Calculator

Estimate your lean body mass — everything except body fat — using the Boer formula, a useful figure for tailoring calorie and protein targets more precisely.

Waist-to-Hip Ratio Calculator

Find your waist-to-hip ratio, a common indicator of body fat distribution — a measure that research links to health risk independent of overall body weight.

BMI Prime Calculator

Find your BMI Prime, a simple ratio showing how close you are to the upper healthy BMI limit — a unitless way to interpret BMI at a glance.

CCTV & Networking

IPv4 Subnet Calculator

Find the network address, broadcast address and usable host range for an IP address and subnet mask — the essential subnet-boundary calculation for network configuration.

CIDR Calculator

Find subnet details from a single CIDR block like 192.168.1.0/24 — parsing the compact notation networking professionals use to describe IP address ranges.

CCTV Storage Calculator

Estimate how much storage an NVR/DVR needs for a given camera count, bitrate and retention period — the core sizing calculation behind every CCTV storage purchase decision.

IP Subnet Calculator

Find the number of usable hosts and total addresses for a given CIDR prefix — a quick reference for the relationship between subnet size and host capacity.

Camera Field of View Calculator

Find a camera's horizontal field of view from its sensor width and lens focal length — the two physical specifications that together determine how wide a scene a camera actually captures.

IPv6 Address Calculator

Expand a shorthand IPv6 address to its full form, or compress it to canonical shorthand — untangling the compact notation used to make IPv6's much longer addresses manageable.

CCTV Camera Coverage Calculator

Estimate how many cameras are needed to cover a given area — a starting-point planning figure before a professional site survey refines the actual layout.

NVR Retention Days Calculator

Find how many days of footage a given amount of NVR/DVR storage will hold — the inverse of storage sizing, useful for checking existing capacity against a retention requirement.

Network Bandwidth Calculator

Find the total network bandwidth needed to stream multiple cameras or devices simultaneously — the core sizing calculation for any link carrying sustained, continuous traffic.

PoE Power Budget Calculator

Check whether a PoE switch's power budget can support all connected devices — the total-power planning check that prevents devices from silently failing to power on.

Wi-Fi Signal Loss (FSPL) Calculator

Estimate free-space path loss for a wireless link at a given distance and frequency — the theoretical minimum signal attenuation before any real-world obstacles are considered.

PoE Cable Voltage Drop Calculator

Estimate voltage drop across a PoE/Ethernet cable run for a given wire gauge, current and length — a critical check for reliably powering cameras and access points over long cable runs.

SMPTE ST 2110 Bandwidth Calculator

Estimate the IP network bandwidth an uncompressed SMPTE ST 2110-20 video essence flow needs, from resolution, frame rate, chroma subsampling and bit depth.

Fiber Optic Latency Calculator

Estimate the one-way propagation delay of a fiber optic link from its distance — the hard physical floor on latency that no network optimization can beat.

Unit Conversion

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin instantly — the three temperature scales used across everyday life, US customary use, and science.

Length Converter

Convert between metric and imperial length units instantly — from millimeters to miles, covering the units most commonly needed in everyday, engineering, and international contexts.

Weight Converter

Convert between metric and imperial weight units instantly — from milligrams to tonnes, covering the units used in everyday life, shipping, cooking, and science.

Cooking Measurement Converter

Convert between teaspoons, tablespoons, cups, milliliters and liters — essential for following a recipe written in an unfamiliar measurement system.

Speed Converter

Convert between km/h, mph, m/s and knots — the units used across road travel, physics, and marine or aviation navigation.

Volume Converter

Convert between liters, milliliters, gallons and cubic meters — the units used across cooking, fuel, industrial, and scientific contexts.

Area Converter

Convert between square meters, square feet, hectares and acres — the units most commonly used across real estate, land measurement, and construction worldwide.

Time Converter

Convert between seconds, minutes, hours, days and weeks — the everyday time units used across scheduling, science, and general planning.

Fuel Economy Converter

Convert between miles per gallon and liters per 100 kilometers — the two dominant, inversely-related ways fuel efficiency is expressed around the world.

Pressure Converter

Convert between pascals, bar, PSI and atmospheres — units that span weather forecasting, tire inflation, scuba diving, and engineering.

Angle Converter

Convert between degrees and radians instantly — the two standard ways of measuring angles, one intuitive for everyday use and one essential for mathematics and physics.

Energy Converter

Convert between joules, calories, kilocalories and kilowatt-hours — units that span physics, nutrition, and household energy billing.

Scam & Fraud Risk Checkers

Scam Risk Score Calculator

Answer 10 quick yes/no questions about a message, call or offer to get a 0-100 scam-risk score, a risk level, and a clear recommendation — entirely in your browser.

Website Trust Score Calculator

Paste a URL to check it against structural phishing red flags — HTTPS, IP-literal hosts, suspicious TLDs, typosquatted brand names, and phishing-style wording — instantly and entirely in your browser.

Job Offer Scam Risk Calculator

Score a job offer against 7 common fake-job red flags — unusually high pay, no real interview, generic email, messaging-app-only contact, and upfront fees.

Investment Scam Risk Calculator

Score an investment opportunity against 5 classic Ponzi and pump-and-dump red flags — guaranteed returns, lock-in periods, referral bonuses, crypto and withdrawal restrictions.

Romance Scam Risk Calculator

Score an online relationship against 6 patterns common to romance scams — never meeting in person, money requests, and classic cover stories.

Marketplace Scam Risk Calculator

Score a Facebook Marketplace, Craigslist or online classifieds listing against 5 common buyer/seller scam patterns before you pay or ship.

Identity Theft Risk Calculator

Score your current identity theft exposure against 5 common risk factors — password reuse, data breaches, phishing clicks, SSN sharing and credit monitoring.

Senior Fraud Risk Calculator

Score a situation affecting an older adult against 6 fraud patterns disproportionately targeted at seniors — useful for yourself or when checking in on a loved one.

QR Code Scam Risk Calculator

Score the situation around a QR code you scanned or received — where it came from and what it asked for — against common 'quishing' scam patterns.

Business Invoice Fraud Risk Calculator

Score a vendor invoice or payment-change request against 5 patterns common to Business Email Compromise (BEC) and invoice fraud before approving payment.

Currency & Crypto

Crypto Profit/Loss Calculator

Work out the real profit or loss on a crypto trade after fees — enter your buy price, sell price, quantity and trading fee to see the actual return.

Leverage Liquidation Price Calculator

Estimate the approximate price at which a leveraged long or short position gets liquidated, given your entry price, leverage and maintenance margin.

Crypto Gas Fee Calculator

Convert a gas limit and gas price into the actual transaction fee, in both ETH and dollar terms, for an Ethereum or EVM-compatible transaction.

Crypto DCA (Average Cost) Calculator

Find your average cost basis across all your crypto purchases and see your current unrealized profit or loss against today's price.

Crypto Staking Rewards Calculator

Estimate the compounding rewards from staking a crypto asset over time, given a stated APY and how often rewards compound.

Crypto Mining Profitability Calculator

Estimate daily and monthly mining profit after electricity costs, based on your expected coin output, power draw and local electricity rate.

Currency Exchange Margin Calculator

See exactly how much a bank or exchange service's rate differs from the true mid-market rate — and how much that hidden margin actually costs you.

Bitcoin Halving Reward Calculator

Find the block reward after a given number of Bitcoin halvings, and see its dollar value and the network's daily coin issuance at that reward level.

Crypto Portfolio Rebalance Calculator

Find exactly how much to buy or sell of each asset to bring a two-asset portfolio back to your target allocation.

Forex Pip Value Calculator

Find how much a single pip move is worth for a given trade size — the foundation for sizing any forex position and setting a stop-loss with a known dollar risk.

Unique Calculators

Dog Age Calculator

Convert your dog's age into human years using a published epigenetic aging formula — a real biological model, not the popular 'multiply by 7' myth.

Sleep Cycle Calculator

Find a wake-up time that lands you at the end of a full 90-minute sleep cycle — a way to plan bedtime around feeling less groggy on waking.

Cat Age Calculator

Convert your cat's age into human years using the commonly-cited veterinary rule of thumb — a two-stage curve that reflects how quickly cats mature early in life.

Pizza Value Calculator

Find which pizza size is the better deal by comparing price per square inch — because pizza area scales with the square of its diameter, bigger is almost always a better value than it first appears.

Screen Time Life Percentage Calculator

Find what percentage of your life (so far) you've spent looking at a screen — a perspective check on daily habits projected across a lifetime.

Coffee-to-Water Ratio Calculator

Find how much coffee to use for a target water amount and brew ratio — the specialty-coffee approach to dialing in a consistent, repeatable cup.

Moving Boxes Calculator

Estimate how many moving boxes you need from your home's total volume — a practical starting point for budgeting supplies before a move.

Firewood Cord Calculator

Find how many cords of firewood a stacked pile represents — the standard way firewood is measured, priced, and sold.

Candle Burn Time Calculator

Estimate how many hours a candle will burn from its wax weight and burn rate — useful for budgeting candles for an event, comparing value between products, or just satisfying curiosity.

Bathtub Fill Time Calculator

Find how long it takes to fill a bathtub from its volume and your tap's flow rate — useful for planning bath time, estimating water use, or just satisfying curiosity.

Geo & Map

GPS Coordinate Distance Calculator

Find the great-circle distance between two GPS coordinates — the straight-line 'as the crow flies' distance across the curved surface of the Earth.

Trip Time Calculator

Estimate travel time from distance and average speed — a quick way to sanity-check how long a road trip, flight, or journey should realistically take.

GPS Midpoint Calculator

Find the geographic midpoint between two GPS coordinates — the point exactly halfway along the great-circle path, not simply the average of the two coordinates.

DMS to Decimal Degrees Calculator

Convert a degrees-minutes-seconds coordinate into decimal degrees — the format almost all modern digital mapping tools and GPS systems use internally.

Land Area Cost Calculator

Find the total price of a plot of land from its area and price per unit — and see the equivalent size in acres for easier comparison across listings.

Elevation Grade Calculator

Find the grade (slope percentage) of a hill or road from rise and run — the standard way steepness is measured and posted on road signs.

Map Scale Calculator

Convert a distance measured on a map into real-world distance using the map's scale — the ratio printed on nearly every topographic and reference map.

Decimal Degrees to DMS Calculator

Convert a decimal-degree coordinate into degrees, minutes and seconds — the traditional coordinate format used on nautical charts, surveys, and older maps.

Bearing Calculator

Find the initial compass bearing from one GPS coordinate to another — the heading you'd start out on to follow the shortest path between two points.

GPS Speed Calculator

Find average speed from two GPS coordinates and the elapsed travel time — a quick sanity check for a logged trip using straight-line distance.

Medicare

Medicare Advantage vs. Original Medicare Cost Calculator

Compare your estimated annual cost under Original Medicare + Medigap + Part D versus a Medicare Advantage plan, based on your own premium and expected out-of-pocket numbers.

Medicare Part B Premium Calculator

Find your 2026 Medicare Part B monthly premium, including any income-related IRMAA surcharge, based on your income and tax filing status.

Medicare Part D Drug Cost Calculator

See what you'll actually pay for prescription drugs under Medicare Part D in 2026 — including exactly when you reach the $2,100 out-of-pocket cap. The old 'donut hole' coverage gap no longer exists.

Medicare Enrollment Timeline Calculator

Find your exact Medicare Initial Enrollment Period window, plus the current Annual and General Enrollment Period dates — based on your 65th birthday (or Medicare eligibility date).

Medicare IRMAA Calculator

See exactly how much extra you're paying for Medicare because of IRMAA — the income-related surcharge added to both Part B and Part D — and which bracket your income falls into.

Medicare Late Enrollment Penalty Calculator

Estimate your permanent monthly Medicare Part B or Part D late enrollment penalty based on how many months you went without coverage.

Medigap Plan Comparison Calculator

Compare exactly what any two Medigap (Medicare Supplement) plan letters cover, side by side. Medigap benefits are federally standardized, so this comparison is the same everywhere in the US regardless of insurer.