Free Health Calculators: BMI, Life Expectancy & Ovulation

Note: these tools give estimates for information only — not medical advice. Talk to a professional about health decisions.

BMI calculator

Body Mass Index estimates whether your weight is in a healthy range for your height. The BMI calculator gives your number instantly plus the category (underweight / healthy / overweight / obese).

What BMI doesn’t tell you: muscle vs fat. Athletes can score “overweight” while being very fit — treat it as a starting point, not a verdict.

Life expectancy calculator

Curious how lifestyle factors add up? The life expectancy calculator estimates based on age, habits, and health factors. It’s a motivational snapshot — small habit changes visibly move the number.

Ovulation calculator

Trying to conceive — or avoiding it? The ovulation calculator estimates fertile windows from cycle dates. Simple, private, no account needed.

Privacy

Health numbers are personal. These calculators run in your browser — no signup, no stored profiles, nothing to leak.

Frequently asked questions

Are these calculators accurate? They use standard published formulas and population data — good estimates, not diagnoses.

Is my health data stored? No — calculations happen in your browser; nothing is saved to an account.

Is it free? Yes — all three calculators are free with no signup.

Can this replace medical advice? No. Use the numbers as information and talk to a healthcare professional for decisions.

CTA: Check your numbers — BMI calculator, free and private.