Health Calculators

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.