Free online health calculators using internationally validated medical formulas (WHO, AHA, Mifflin-St Jeor, Widmark). All calculations happen in your browser — no data is ever sent to a server.
⚖️ BMI Calculator
Calculate Body Mass Index using WHO standards. Get weight category and healthy weight guidance.
🔥 Calorie Calculator
Find your BMR and TDEE with the Mifflin-St Jeor formula. Set calorie targets for any goal.
❤️ Blood Pressure
Classify your reading using AHA 2017 hypertension guidelines with heart health tips.
🧠 Stress Index
10-question psychological assessment of your stress level with self-care recommendations.
🧬 Body Age
Estimate biological age from 8 lifestyle factors: exercise, sleep, diet, smoking, and more.
🌸 Ovulation
Calculate fertile window, next period date, and estimated due date from your last period.
🍷 BAC Calculator
Estimate blood alcohol concentration with Widmark formula and safe driving time.
📏 Growth Percentile
WHO pediatric height/weight percentiles and predicted adult height for children.
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⚕️ Calculator results are for general reference only and do not constitute medical advice. Always consult a qualified healthcare professional.