BMI calculator
Body mass index from height and weight, in metric or imperial units.
Open calculator HealthCalorie & macro calculator
Daily calories and protein, carbs and fat for losing, keeping or gaining weight.
Open calculator HealthBody fat calculator
Body fat percentage from tape measurements (US Navy method).
Open calculator HealthWater intake calculator
How much water to drink a day by weight, exercise and weather.
Open calculator HealthHeart rate zones calculator
Maximum heart rate and the 5 training zones by age.
Open calculator HealthOvulation calculator
Estimated ovulation day, fertile window and next period.
Open calculator HealthSleep calculator
When to go to bed or wake up, by 90-minute sleep cycles.
Open calculator HealthPregnancy due date calculator
Estimated due date, current week and trimester from the last period or conception.
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Questions and answers
Do the results replace medical advice?
No. The calculators give general information based on common formulas. For a personal answer, ask a doctor, dietitian or trainer.
Which formulas are used?
Common ones, for example Mifflin-St Jeor for calories, the US Navy method for body fat and Karvonen for heart rate zones. Each calculator explains it in its questions and answers.
Is the data I enter saved?
No. The math runs in your browser; nothing is sent to the server or saved.