All Calculators
37 published calculators, each with its equation, worked example and limitations documented on the page.
Categories
- Metabolism3Resting and total energy expenditure calculators.
- Calories8Daily calorie targets for maintenance, deficit and surplus.
- Nutrition7Macronutrient and individual nutrient calculators.
- Body Composition11Body mass, body fat and lean mass estimates.
- Fitness8Training, pace, heart rate and hydration calculators.
Every calculator
- BMI CalculatorCalculate body mass index in metric or US units, with categories and a healthy-weight range.
- BMI Calculator by AgeCalculate your BMI and see how the reading should be read differently at 25, at 50 and after 65.
- BMI Calculator for MenCalculate your body mass index and see your healthy-weight range, plus why a muscular build can push the number higher than your body fat suggests.
- BMI Calculator for WomenWork out your body mass index and see where it sits on the adult scale, with the context women actually need: body-fat differences, waist thresholds and when BMI does not apply.
- BMI ChartSee the full adult BMI chart, then calculate exactly where your own height and weight fall on it.
- BMR CalculatorEstimate your basal metabolic rate (BMR) and daily calorie needs with the Mifflin-St Jeor equation.
- Body Fat CalculatorEstimate body fat percentage from tape measurements using the US Navy method.
- Body Surface Area CalculatorCalculate body surface area with the Mosteller, Du Bois, Haycock and Gehan-George formulas.
- Calorie CalculatorWork out how many calories a day you need to lose, maintain or gain weight.
- Calorie Calculator to Gain WeightCalculate the exact daily calorie intake needed to gain weight at the rate you choose.
- Calorie Deficit CalculatorFind the daily intake that creates the deficit you need for a target rate of weight loss.
- Calorie Intake CalculatorFind how many calories a day you should eat for your body, your activity level and your goal.
- Calorie Surplus CalculatorSet an intake for controlled weight or muscle gain without an oversized surplus.
- Calories Burned CalculatorEstimate calories burned in a session from activity type, body weight and duration.
- Carbohydrate CalculatorCalculate daily carbohydrate grams from your calorie needs and preferred share.
- Fat Intake CalculatorCalculate daily dietary fat grams from your calorie needs and preferred share.
- Heart Rate Zone CalculatorCalculate maximum heart rate and five training zones, with optional Karvonen zones.
- Height Percentile CalculatorSee what percentage of adults you are taller than, based on national height distributions.
- Ideal Weight CalculatorCompare the Robinson, Miller, Devine and Hamwi ideal-weight formulas plus the healthy BMI range.
- Keto CalculatorGet your ketogenic macros - net carbs, protein and fat - based on your body, activity level and goal.
- Keto Macro CalculatorSet keto macros by capping net carbs, fixing protein from body weight and filling the rest with fat.
- Lean Body Mass CalculatorEstimate lean body mass with the Boer, James and Hume equations.
- Macro CalculatorTurn your calorie target into daily protein, carbohydrate and fat grams.
- Macro Calculator for Weight LossGet cutting macros: a calorie target with a deficit built in, and a protein floor that protects muscle while you lose fat.
- Maintenance Calorie CalculatorEstimate the calories that keep your weight stable, with a realistic working range.
- Marathon Pace CalculatorFind the exact pace per mile and per kilometre needed to hit your marathon goal time, with split times along the way.
- Pace CalculatorConvert distance and time into pace per mile and per kilometre, plus race-distance finish times.
- Protein CalculatorFind your daily protein range in grams based on body weight and training.
- Race Pace CalculatorSet a goal time for any race distance and get the pace, speed and splits required to run it.
- RMR CalculatorEstimate resting metabolic rate with Mifflin-St Jeor, Harris-Benedict and Katch-McArdle.
- Running Pace CalculatorWork out your running pace, finish time or distance - enter any two and the calculator solves for the third.
- TDEE CalculatorEstimate total daily energy expenditure from your BMR and activity level.
- Water Intake CalculatorEstimate daily water intake from body weight, exercise time and climate.
- Weight ConverterConvert between kilograms, pounds, stones, grams and ounces instantly and precisely.
- Weight Gain CalculatorWork out the daily calorie surplus, protein target and timeline needed to gain weight steadily rather than sloppily.
- Weight Loss CalculatorEnter your details and goal weight to see the daily calorie target, the weekly rate and the realistic date you would reach it.
- Weight Percentile CalculatorSee where your body weight sits in the adult population distribution for your sex.