10 calculators · more added every week

Fitness & nutrition made measurable.

Free, evidence-based calculators for macros, calories, body composition and supplements. Instant results, no signup, mobile-first.

Calculate my macros Find my TDEE

Instant calculations
Peer-reviewed formulas
Mobile-first design

All calculators

Pick a calculator — your result appears as you type.

Nutrition

Calories, macros and protein for any goal

Macro Calculator

Daily protein, carbs and fat targets

Calculate personalised daily macronutrient targets for cutting, maintenance or bulking based on your TDEE.

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Calorie Calculator

Daily calorie target for your goal

Estimate the calories you need each day to lose, maintain or gain weight.

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Protein Calculator

Daily protein for your goal

Find the optimal daily protein intake for muscle gain, fat loss or general health.

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TDEE Calculator

Total Daily Energy Expenditure

Calculate your Total Daily Energy Expenditure (TDEE) — the calories you burn in a typical day.

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Body Metrics

Track BMI, body fat and composition

BMI Calculator

Body Mass Index and category

Calculate your Body Mass Index (BMI) and see where you fall on the WHO classification.

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Body Fat Calculator

US Navy method body-fat estimate

Estimate body-fat percentage using the US Navy circumference method.

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Hydration

Daily water and electrolyte needs

Water Intake Calculator

Daily water target in litres

Calculate how much water you should drink each day based on body weight and exercise.

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Supplements

Evidence-based dosing for common supplements

Creatine Calculator

Loading & maintenance creatine dose

Calculate creatine monohydrate loading and maintenance doses based on body weight.

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Magnesium Calculator

Daily magnesium requirement

Estimate your daily magnesium requirement based on age and sex (RDA).

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Caffeine Calculator

Safe & performance caffeine dose

Calculate a performance and a safe upper caffeine dose for your body weight.

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