Home › Health

Health calculators

Estimate the numbers behind fitness and health questions: BMI, calories burned at rest, daily calorie needs, body-fat percentage and pregnancy dates.

BMI Calculator Calculate your body mass index from your weight and height, see the WHO category and the healthy weight range for your height BMR Calculator Calculate your basal metabolic rate with the Mifflin-St Jeor equation: the calories your body burns at complete rest, by weight, height, age and sex Ideal Weight Calculator Find a healthy weight range for your height from BMI thresholds, plus a BMI 22 target weight Navy Body Fat Calculator Estimate body fat percentage from height, neck, waist and hip measurements using the US Navy formula, with a category range Ovulation Calculator Estimate ovulation day, the fertile window and the next period from your last period date and typical cycle length Pregnancy Due Date Calculator Estimate a pregnancy due date from the first day of your last period and cycle length, using Naegele's rule, plus the estimated conception date TDEE Calculator Calculate total daily energy expenditure from your BMR and activity level, with calorie targets for losing, maintaining and gaining weight

What you can calculate

Health calculators are screening and planning tools, not diagnoses. BMI, BMR and TDEE are estimates built from population averages, and individual bodies vary.

Use the results to spot trends and set rough targets; for decisions about treatment, medication or a medical condition, speak to a clinician.

Frequently asked questions

Are these calculators free?

Yes. Every calculator on this site is free, needs no account and runs entirely in your browser.

How accurate are the results?

Each page states its assumptions and shows a worked example. The formulas are standard industry formulas, but real-world results depend on fees, taxes and individual circumstances.

Do you store what I type?

No. The calculation runs in your browser and nothing is submitted to a server.

Other categories

Loans · Investing · Salary & Tax · Dates & Time · Conversions