Free Health Calculators Online

BMI calculator, ideal weight, calorie needs, water intake, sleep calculator, pregnancy due date, ovulation calculator. All free, all private.

18 Tools

Frequently Asked Questions

These calculators use standard medical formulas (Mifflin-St Jeor, Devine, Robinson, etc.) and provide estimates. Always consult a healthcare professional for personalized advice.
No. All calculations happen in your browser. No data is sent to any server. The water intake tracker uses localStorage which stays on your device.
Yes. All health calculators support both metric (kg, cm) and imperial (lbs, feet/inches) units with easy toggle switches.
Yes. All health calculators are 100% free with no sign-up, no limits, and no hidden fees.

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Last updated: June 2026