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Health and fitness calculators you can trust
BMI, calories, macros, pace and pregnancy dates, each based on a published, widely used formula.
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Body & weight
BMI, body fat and a healthy weight for your height.
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BMI Calculator
Your body mass index, weight category and healthy weight range, in metric or US units.
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Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy tape method and compare it with a BMI-based estimate.
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Ideal Weight Calculator
Ideal body weight from the Robinson, Miller, Devine and Hamwi formulas, next to the healthy BMI range.
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Army Body Fat Calculator
Check the U.S. Army's current body composition standard: a waist-to-height ratio below 0.55.
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Lean Body Mass Calculator
Lean body mass from your height and weight with the Boer, James and Hume formulas, plus the body fat each implies.
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Healthy Weight Calculator
The healthy weight range for your height, where your weight sits, and how far you are from the range.
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Overweight Calculator
Check whether a weight is overweight for its height, how much above the healthy range it is, and your waist-to-height ratio.
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Body Type Calculator
Find your body shape (hourglass, pear, rectangle, inverted triangle and more) from four tape measurements.
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Body Surface Area Calculator
Body surface area in square meters from height and weight, with the Mosteller, Du Bois, Haycock, Gehan & George and Boyd formulas.
Diet & nutrition
Calories, macros, protein and your daily energy needs.
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Calorie Calculator
Daily calories to maintain your weight, plus gradual targets for losing or gaining, using the Mifflin-St Jeor equation.
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BMR Calculator
Your basal metabolic rate from the Mifflin-St Jeor, revised Harris-Benedict and Katch-McArdle equations.
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TDEE Calculator
Total daily energy expenditure: your BMR multiplied by your activity level, with every level side by side.
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Macro Calculator
Split your daily calories into grams of protein, carbs and fat, with preset or custom percentages and grams per meal.
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Carbohydrate Calculator
How many grams of carbohydrate a day fit 45–65% of your calories, with low, middle and high levels and grams per meal.
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Protein Calculator
Daily protein in grams from your body weight, from the RDA minimum to targets for older adults and people who train.
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Fat Intake Calculator
How many grams of fat a day fit 20–35% of your calories, and your saturated fat limit of 10%.
Fitness
Pace, heart rate, calories burned and strength.
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Pace Calculator
Running pace, finish time or distance in km or miles, with race presets, splits and equivalent race times.
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Calories Burned Calculator
Calories burned in 40 common activities from your weight and the time spent, using MET values from the 2024 Compendium.
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One Rep Max Calculator
Estimate your one-rep max from a set of up to 12 reps with five formulas, plus a percentage table for training loads.
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Target Heart Rate Calculator
Your maximum heart rate, target exercise range and five training zones, by 220 − age, Tanaka or the Karvonen method.
Pregnancy & fertility
Due dates, ovulation, cycles and pregnancy weeks.
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Pregnancy Calculator
How many weeks pregnant you are, your due date, trimester and key milestones, from your last period, conception, ultrasound or IVF.
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Due Date Calculator
Your estimated due date by Naegele's rule, adjusted for cycle length, or from a conception or IVF transfer date.
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Pregnancy Weight Gain Calculator
Recommended pregnancy weight gain for your pre-pregnancy BMI, one baby or twins, and the expected range for your week.
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Pregnancy Conception Calculator
Estimate your conception date and fertile window from your last period or due date, with the early pregnancy timeline.
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Ovulation Calculator
Your estimated ovulation date and fertile window for the next 6 cycles, from your last period and cycle length.
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Conception Calculator
Count back from a due date or birth date to the likely conception date, with an honest range of uncertainty.
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Period Calculator
Predict your next 6 periods and the fertile days in each cycle from your last period, cycle length and period length.
Medical
Blood alcohol and kidney function estimates.
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GFR Calculator
Estimate kidney function (eGFR) from a creatinine blood test with the race-free 2021 CKD-EPI equation, and see the GFR category.
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BAC Calculator
A rough estimate of blood alcohol content from your drinks, weight and time, using the Widmark formula. Never use it to decide whether to drive.
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