✅ 30 Free Tools — No Sign-up

Health Calculators That Actually Work

Instant, science-backed calculators for body composition, nutrition, fitness, pregnancy, and general health. All free, all in your browser.

⚖️ Body & Weight

⚖️ BMI Calculator Body Mass Index with health category 💪 Body Fat % US Navy method with category rating ⭐ Ideal Weight Robinson, Miller, Devine formulas 🦴 Lean Body Mass Boer & James formula estimates 📏 Waist-to-Hip Ratio WHO health risk classification 📐 Waist-to-Height Ratio Central obesity indicator 🏋️ FFMI Fat-Free Mass Index for athletes

🍎 Nutrition & Energy

🔥 BMR Calculator Basal Metabolic Rate at rest ⚡ TDEE Calculator Total Daily Energy Expenditure 🥙 Calorie Calculator Daily calories for your goal 🥗 Macro Calculator Protein, carbs & fat targets 🥩 Protein Intake Daily protein by activity level 💧 Water Intake Daily hydration needs

🏃 Fitness

🏆 One Rep Max Max strength from reps & weight 🚴 VO2 Max Aerobic fitness estimate ❤️ Heart Rate Zones 5-zone training breakdown 🏃 Calories Burned Exercise energy expenditure ⏱️ Running Pace Pace, speed & finish time

🤰 Pregnancy & Fertility

🤰 Due Date Estimated delivery date 📅 Ovulation Ovulation day & fertile window 🌸 Fertility Window Best days to conceive 👶 Baby Growth Fetal size by week

🩺 General Health

🎂 Age Calculator Exact age in years, months, days 🍺 BAC Calculator Blood alcohol concentration 🍷 Alcohol Units Units per drink and per week 🚭 Smoking Cost Annual financial & health cost 😴 Sleep Calculator Optimal wake & sleep times 🩸 Diabetes Risk Type 2 diabetes risk score 🫀 Cholesterol Ratio HDL/LDL cardiovascular risk 💉 Blood Pressure Stage classification & guidance