Health Calculators — BMI, TDEE, BMR, Calories, Sleep & Body Mass Index

Science-backed calculators for daily energy needs, body mass index and sleep cycle optimization.

TDEE Calculator

Daily calorie needs, BMR and macro split for your goals.

BMI Calculator

Body Mass Index in seconds — WHO adult classification, healthy range included.

Sleep Calculator

The best bedtimes and wake times based on 90-minute sleep cycles.

Why these health tools?

Peer-reviewed formulas — Mifflin-St Jeor BMR, WHO BMI ranges, Harvard sleep cycle research.
Age- and sex-adjusted reference ranges where it matters (TDEE ideal weight).
Clear 'talk to a doctor' disclaimers — we provide data, not medical advice.
No sign-up, no data leaves your browser.

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Frequently Asked Questions

Are these medical tools?

No. They're screening and planning tools built on public formulas. Always consult a doctor or registered dietitian before major dietary, exercise or sleep-schedule changes.

Which calculator should I start with?

For weight goals: TDEE (it includes BMR as a sub-result). For quick health status: BMI. For mornings that don't feel horrible: Sleep.

Do you store my data?

No. Everything runs in your browser — no accounts, no tracking of inputs.