Health & fitness calculators

Simple estimates for weight, calories, fitness and body measurements, with an explanation of what each number does and does not tell you.

These tools are for general information and are not medical advice.

With WHO category labels

By activity, duration & weight

min/km ↔ min/mile ↔ mph ↔ km/h

Protein, carbs & fat from calories

Interpret your mmHg reading

Daily calorie burn from BMR & activity

Navy method body fat estimate

Daily calories for dogs & cats

Devine, Robinson, Miller & Hamwi

WHO BMI range for your height

IOM guidelines by week & BMI

From last period or conception

Ovulation day & fertile window

Next periods & fertile windows

eGFR from creatinine (CKD-EPI 2021)

Shape from bust, waist & hips

Mosteller, Du Bois & more in m²

Blood alcohol (Widmark estimate)

US Army tape method

Estimate 1RM from any set

Karvonen training zones

Legacy points from a food label