9 FREE TOOLS · ♡
Health & wellbeing calculators
Explore adult body and energy estimates, cycle calendars and pregnancy date calculations with clear limitations.
Pregnancy & cycle calendars
Estimate pregnancy dates and regular-cycle calendar timings.
Explore topic ↗2 calculatorsAdult body measurements
Calculate adult BMI with its scope and limitations stated.
Explore topic ↗4 calculatorsAdult energy estimates
Explore named resting-energy equations and transparent activity assumptions.
Explore topic ↗All health & wellbeing calculators
BMI Calculator
Calculate adult body mass index from height and weight.
BMR Calculator
Estimate adult resting energy expenditure using the simplified Mifflin–St Jeor equation.
TDEE Calculator
Estimate adult daily maintenance calorie needs from height, weight, age and a chosen activity multiplier.
Calories Burned Calculator
Estimate gross activity energy expenditure using an entered MET value.
Pregnancy Due Date Calculator
Estimate a pregnancy due date from the last menstrual period or a known conception date.
Ovulation Calculator
Estimate an ovulation date and an illustrative fertile window from a regular menstrual cycle.
Period Calculator
Estimate the next three period start dates from a typical regular cycle length.
Body Fat Percentage Calculator
Estimate adult body fat percentage using the BMI-based Deurenberg equation, age and sex coefficient.
Macro Calculator
Convert your chosen daily calorie amount and macronutrient percentages into grams of protein, carbohydrate and fat.
Make your inputs count
Body and energy models here are for adults; pregnancy and cycle tools are calendar estimates with separate assumptions. BMI and expenditure equations do not diagnose health or prescribe intake. Use the equation and assumptions stated, and recognise that individual measurements and circumstances can differ.