Health & fitness

Health & fitness calculators

Trustworthy health numbers in seconds: your Body Mass Index, the calories your body needs each day, a healthy target weight, your pregnancy due date and your most fertile days. Each uses a formula or guideline that doctors rely on.

These are guides, not medical advice — useful for planning, but see a doctor for anything that concerns you. Everything runs in your browser.

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BMI calculatorFind your Body Mass Index from your height and weight, and the healthy weight range for your height.
Calorie calculatorHow many calories a day to lose, keep or gain weight — with safe minimums and the weeks to your goal weight.
Food calorie calculatorCalories, protein, carbs and fat in roti, rice, biryani, daal, chai and 200 more foods — add up your day.
Body fat calculatorEstimate your body fat % with a tape measure (US Navy method) or from your BMI — with fat and lean mass.
Water intake calculatorHow much water to drink a day for your weight, exercise and weather — in litres and glasses.
BMR & calorie calculatorFind your BMR and the daily calories to maintain, lose or gain weight, from the Mifflin–St Jeor formula.
Macro calculatorGrams of protein, carbs and fat a day and per meal — balanced, high-protein, low-carb or keto.
Calories burned calculatorCalories burned walking, running, cycling, cricket, gym, housework and 60+ activities — and minutes to burn a target.
Ideal weight calculatorFind a healthy target weight for your height and sex, plus the full healthy weight range.
Due date calculatorEstimate a baby's due date from the last period, conception or IVF transfer date, with key pregnancy dates.
Ovulation calculatorEstimate your ovulation day, fertile window and next period, plus the dates for your next 3 cycles.

Pick a calculator (11)

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