All Calculators

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.

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.

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.

Aspect Ratio Calculator

Scale a resolution to a new width while keeping the same aspect ratio.

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.

Data Storage Converter

Convert between bytes, kilobytes, megabytes, gigabytes and terabytes.

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.

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.

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.

Cron Job Frequency Calculator

Find how many times a scheduled job runs per day and per month from its interval.

EMI Calculator

Estimate your monthly loan repayment, total interest and full amortization schedule. [edited via admin]

GST Calculator

Add or remove GST from an amount, either direction, instantly.

Compound Interest Calculator

See how your money grows when interest compounds instead of staying simple.

Retirement Savings Calculator

See how much your monthly retirement contributions could grow to.

Take-Home Pay Calculator

Estimate your net monthly pay after tax and other deductions.

Discount Calculator

Find the sale price and how much you save on any discount.

Currency Converter

Convert an amount using any exchange rate you enter.

Loan Eligibility Calculator

Estimate the maximum loan amount you could qualify for, based on your income.

Profit Margin Calculator

Find your profit margin percentage from revenue and cost.

ROI Calculator

Find the return on investment percentage for any gain and cost.

Credit Card Payoff Calculator

Find out how many months it takes to pay off a credit card balance.

Freelance Rate Calculator

Find the hourly rate you need to charge to hit your income target.

Simple Interest Calculator

Calculate simple interest and the total amount owed or earned.

Hourly to Salary Calculator

Convert an hourly wage into equivalent annual, monthly and weekly pay.

Sales Tax Calculator

Add sales tax to a price and see the total you'll pay.

Net Worth Calculator

Add up what you own and subtract what you owe to find your net worth.

Inflation Calculator

See what today's money will be worth in the future after inflation.

Savings Goal Calculator

Find out how much to save each month to hit your target on time.

Overtime Pay Calculator

Find your total pay including overtime at a premium rate.

Markup Calculator

Find the selling price and profit from a cost and a markup percentage.

Debt-to-Income Ratio Calculator

Find your debt-to-income ratio, a key number lenders use to assess borrowing capacity.

Rule of 72 Calculator

Estimate how many years it takes an investment to double at a given rate.

Break-Even Point Calculator

Find out how many units you need to sell before you start turning a profit.

Tip Calculator

Work out the tip and split the bill fairly among your group.

Annuity Calculator

Find the lump sum needed today to generate a fixed monthly payment.

Depreciation Calculator

Find the annual depreciation and current book value of an asset.

Ohm's Law Calculator

Find resistance and power from voltage and current using Ohm's Law.

Resistor Series/Parallel Calculator

Find the total resistance of two resistors in series or parallel.

Kinetic Energy Calculator

Find the kinetic energy of a moving object from its mass and velocity.

Beam Deflection Calculator

Find the maximum deflection of a simply supported beam under a center point load.

Three-Phase Power Calculator

Find real power delivered by a balanced three-phase electrical system.

Power Factor Calculator

Find the power factor of an electrical load from real and apparent power.

Bolt Torque Calculator

Estimate the tightening torque needed for a target bolt clamp force.

Thermal Expansion Calculator

Find how much a material expands when heated, from its length and coefficient of thermal expansion.

Fluid Flow Rate Calculator

Find the volumetric flow rate through a pipe from cross-sectional area and velocity.

Gear Ratio Calculator

Find the gear ratio and output speed from two gears' tooth counts.

Voltage Divider Calculator

Calculate the output voltage of a two-resistor voltage divider circuit.

Horsepower to Watts Calculator

Convert between mechanical horsepower and watts.

RC Charge Time Calculator

Find how long a resistor-capacitor circuit takes to charge to a given percentage.

Force Calculator

Find force from mass and acceleration using Newton's second law.

Reynolds Number Calculator

Find the Reynolds number for pipe flow to check whether it's laminar or turbulent.

Torque Calculator

Find torque from force and lever arm length.

Pressure Calculator

Find pressure from force and the area it's applied over.

Capacitor Series/Parallel Calculator

Find the total capacitance of two capacitors in series or parallel.

Inductor Energy Storage Calculator

Find the energy stored in an inductor's magnetic field.

Flooring Calculator

Estimate flooring area and cost, including a waste allowance.

Concrete Calculator

Estimate the concrete volume and number of bags needed for a slab.

Mulch Calculator

Find how many cubic yards of mulch you need to cover a garden bed.

Tile Calculator

Estimate how many tiles you need for a floor or wall.

Brick Calculator

Estimate how many bricks you need for a wall.

Drywall Calculator

Find how many drywall sheets you need for a given wall or ceiling area.

Roofing Calculator

Estimate roof surface area from footprint dimensions and roof pitch.

Stud Spacing Calculator

Find how many wall studs you need for a given wall length and spacing.

Fence Calculator

Estimate the posts and panels needed for a fence.

Paint Calculator

Estimate how much paint you'll need for a wall, accounting for doors and windows.

Paver Calculator

Find how many pavers you need for a patio or walkway, including a waste allowance.

Stair Calculator

Find the number of steps and exact riser height for a staircase.

Topsoil Calculator

Find how many cubic yards of topsoil you need to fill or level an area.

Deck Board Calculator

Find how many deck boards you need for a given deck area.

Asphalt Calculator

Estimate the tonnage of asphalt needed for a driveway or paving project.

Gravel Calculator

Estimate the volume and weight of gravel needed for a path or driveway.

Insulation R-Value Calculator

Find the total R-value of an insulation layer from its thickness and material.

Retaining Wall Block Calculator

Find how many blocks you need for a retaining wall from its length and height.

Wallpaper Calculator

Find how many wallpaper rolls you need for a room's wall area.

Percentage Calculator

Find what a percentage of a number is, instantly.

CAGR Calculator

Find the compound annual growth rate between a starting and ending value.

Percentage Change Calculator

Find the percentage increase or decrease between two numbers.

Average Calculator

Find the average (mean) of up to five numbers.

Quadratic Equation Calculator

Solve ax² + bx + c = 0 for its real roots, instantly.

Circle Calculator

Find the area and circumference of a circle from its radius.

Triangle Area Calculator

Find a triangle's area from its three side lengths, using Heron's formula.

Slope Calculator

Find the slope of a line between two points.

Distance Between Two Points Calculator

Find the straight-line distance between two points on a plane.

Ratio to Percentage Calculator

Convert a ratio like 3:2 into the percentage share of each part.

Percentage Error Calculator

Find the percentage error between a measured and an actual value.

Logarithm Calculator

Find the logarithm of a number to any base.

Exponent Calculator

Raise any number to any power, including negative and fractional exponents.

Root Calculator

Find the nth root of any positive number.

Sphere Volume Calculator

Find the volume and surface area of a sphere from its radius.

Cylinder Volume Calculator

Find the volume of a cylinder from its radius and height.

Geometric Mean Calculator

Find the geometric mean of two or three numbers.

BMI Calculator

Check your Body Mass Index and see which healthy range you fall into.

Calorie Calculator

Estimate your daily calorie needs based on your body and activity level.

Calories Burned Calculator

Estimate calories burned during exercise using MET values.

Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy circumference method.

BMR Calculator

Estimate the calories your body burns at rest, using the Mifflin-St Jeor formula.

Pregnancy Due Date Calculator

Estimate your due date and current week of pregnancy from your last menstrual period.

Running Pace Calculator

Find your running pace per kilometer and average speed.

Macro Calculator

Split your daily calories into protein, carb and fat targets in grams.

Water Intake Calculator

Estimate how much water to drink each day based on your weight and activity.

Protein Intake Calculator

Estimate your daily protein needs based on body weight and activity level.

Heart Rate Zone Calculator

Find your target heart rate zones for fat burning and cardio training.

Ideal Weight Calculator

Estimate a healthy reference weight for your height using the Devine formula.

Target Heart Rate Calculator (Karvonen)

Find your target training heart rate using the Karvonen method, which factors in resting heart rate.

Lean Body Mass Calculator

Estimate your lean body mass — everything except body fat — using the Boer formula.

Waist-to-Hip Ratio Calculator

Find your waist-to-hip ratio, a common indicator of body fat distribution.

BMI Prime Calculator

Find your BMI Prime, a simple ratio showing how close you are to the upper healthy BMI limit.

IPv4 Subnet Calculator

Find the network address, broadcast address and usable host range for an IP address and subnet mask.

CIDR Calculator

Find subnet details from a single CIDR block like 192.168.1.0/24.

CCTV Storage Calculator

Estimate how much storage an NVR/DVR needs for a given camera count, bitrate and retention period.

IP Subnet Calculator

Find the number of usable hosts and total addresses for a given CIDR prefix.

Camera Field of View Calculator

Find a camera's horizontal field of view from its sensor width and lens focal length.

IPv6 Address Calculator

Expand a shorthand IPv6 address to its full form, or compress it to canonical shorthand.

CCTV Camera Coverage Calculator

Estimate how many cameras are needed to cover a given area.

NVR Retention Days Calculator

Find how many days of footage a given amount of NVR/DVR storage will hold.

Network Bandwidth Calculator

Find the total network bandwidth needed to stream multiple cameras or devices simultaneously.

PoE Power Budget Calculator

Check whether a PoE switch's power budget can support all connected devices.

Wi-Fi Signal Loss (FSPL) Calculator

Estimate free-space path loss for a wireless link at a given distance and frequency.

PoE Cable Voltage Drop Calculator

Estimate voltage drop across a PoE/Ethernet cable run for a given wire gauge, current and length.

Fiber Optic Latency Calculator

Estimate the one-way propagation delay of a fiber optic link from its distance.

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin instantly.

Length Converter

Convert between metric and imperial length units instantly.

Weight Converter

Convert between metric and imperial weight units instantly.

Cooking Measurement Converter

Convert between teaspoons, tablespoons, cups, milliliters and liters.

Speed Converter

Convert between km/h, mph, m/s and knots.

Volume Converter

Convert between liters, milliliters, gallons and cubic meters.

Area Converter

Convert between square meters, square feet, hectares and acres.

Time Converter

Convert between seconds, minutes, hours, days and weeks.

Fuel Economy Converter

Convert between miles per gallon and liters per 100 kilometers.

Pressure Converter

Convert between pascals, bar, psi and atmospheres.

Angle Converter

Convert between degrees and radians instantly.

Energy Converter

Convert between joules, calories, kilocalories and kilowatt-hours.

AI Token Cost Calculator

Estimate the cost of an LLM API call from token count and price per 1,000 tokens.

LLM VRAM Requirement Calculator

Estimate how much GPU memory (VRAM) is needed to run a language model, from its parameter count.

Prompt Token Estimator

Get a quick estimate of how many tokens a piece of text will use.

AI Tool ROI Calculator

Find the net monthly value of an AI tool from hours saved versus its subscription cost.

GPU Training Cost Calculator

Estimate the compute cost of training or fine-tuning a model on rented GPUs.

AI Image Generation Cost Calculator

Estimate the cost of generating a batch of AI images.

Chatbot Cost per Conversation Calculator

Estimate the monthly LLM cost of running a chatbot from average tokens per conversation.

AI Inference Latency Calculator

Estimate how long a model takes to generate a response, from tokens per second throughput.

Vector Embedding Storage Calculator

Estimate the raw storage size of a set of vector embeddings.

Context Window Usage Calculator

Find what percentage of a model's context window your prompt is using.

Dog Age Calculator

Convert your dog's age into human years using a published epigenetic aging formula.

Sleep Cycle Calculator

Find a wake-up time that lands you at the end of a full 90-minute sleep cycle.

Cat Age Calculator

Convert your cat's age into human years using the commonly-cited veterinary rule of thumb.

Pizza Value Calculator

Find which pizza size is the better deal by comparing price per square inch.

Screen Time Life Percentage Calculator

Find what percentage of your life (so far) you've spent looking at a screen.

Coffee-to-Water Ratio Calculator

Find how much coffee to use for a target water amount and brew ratio.

Moving Boxes Calculator

Estimate how many moving boxes you need from your home's total volume.

Firewood Cord Calculator

Find how many cords of firewood a stacked pile represents.

Candle Burn Time Calculator

Estimate how many hours a candle will burn from its wax weight and burn rate.

Bathtub Fill Time Calculator

Find how long it takes to fill a bathtub from its volume and your tap's flow rate.

Social Media Engagement Rate Calculator

Find your engagement rate from likes, comments, shares and follower count.

Creator Revenue Estimator

Estimate ad revenue from video views and an RPM (revenue per 1,000 views) figure.

Follower Growth Rate Calculator

Find your follower growth rate between two points in time.

Subscriber Milestone Calculator

Estimate how many days until you reach a subscriber or follower milestone, at your current growth rate.

CTR Calculator

Find the click-through rate (CTR) for an ad or post.

CPC Calculator

Find the average cost per click (CPC) for an ad campaign.

CPM Calculator

Find the cost per 1,000 impressions (CPM) for an ad campaign.

Video Watch Time Retention Calculator

Find what percentage of a video's length viewers watch on average.

Viral Coefficient (K-Factor) Calculator

Find a product or content's viral coefficient (K-factor) from invites per user and conversion rate.

Posting Frequency Calculator

Find your average posting frequency from total posts and a time period.

GPS Coordinate Distance Calculator

Find the great-circle distance between two GPS coordinates.

Trip Time Calculator

Estimate travel time from distance and average speed.

GPS Midpoint Calculator

Find the geographic midpoint between two GPS coordinates.

DMS to Decimal Degrees Calculator

Convert a degrees-minutes-seconds coordinate into decimal degrees.

Land Area Cost Calculator

Find the total price of a plot of land from its area and price per unit.

Elevation Grade Calculator

Find the grade (slope percentage) of a hill or road from rise and run.

Map Scale Calculator

Convert a distance measured on a map into real-world distance using the map's scale.

Decimal Degrees to DMS Calculator

Convert a decimal-degree coordinate into degrees, minutes and seconds.

Bearing Calculator

Find the initial compass bearing from one GPS coordinate to another.

GPS Speed Calculator

Find average speed from two GPS coordinates and the elapsed travel time.

Age Calculator

Find your exact age in years, months and days from your date of birth.

Date Difference Calculator

Find the number of days, weeks, months and years between any two dates.

Days Until Calculator

Count down the days, weeks and months until any future date.

Add or Subtract Days Calculator

Add or subtract days from a date and find the resulting day of the week.