❤️ Health

11 free health — BMI, TDEE, calorie needs, macro calculator, ideal weight, sleep cycles, water intake and more. Free, instant — formulas follow WHO and medical guidelines.

⚖️ BMI Calculator

Calculate your Body Mass Index (BMI) instantly using metric or imperial units — enter your weight, height, and optional age and gender for a personalised healthy weight range.

🔥 TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) — enter your age, gender, weight, height, and activity level to find out exactly how many calories you burn per day.

🍎 Calorie Calculator

Calculate daily calorie needs based on age, weight, height, gender, and activity level. Find TDEE and calories for weight loss or gain — free online.

🤱 Pregnancy Due Date Calculator

Calculate your due date, current week of pregnancy, and trimester from the first day of your last menstrual period — free online pregnancy calculator.

📅 Ovulation Calculator

Calculate your fertile window and most likely ovulation date from your cycle. See peak fertility days for conception planning — free online ovulation tool.

😴 Sleep Calculator

Calculate the best times to wake up or go to sleep based on 90-minute sleep cycles. Avoid waking during deep sleep — free online sleep calculator.

🥗 Macro Calculator

Calculate daily macronutrient targets (protein, carbs, fat) in grams from your daily calorie target and goal: fat loss, maintenance, or muscle gain — free online.

💧 Water Intake Calculator

Calculate your daily water intake needs based on weight, activity, and climate. Get personalized hydration targets — free online water intake calculator.

📊 Body Fat Calculator

Calculate body fat percentage using the US Navy method (tape measurements) or BMI-based estimate. Free, instant, no sign-up — metric and imperial supported.

🏃 Running Pace Calculator

Calculate running pace, finish time, or distance from any two values. Get results in both min/km and min/mile — free tool.

🎯 Ideal Weight Calculator

Calculate your ideal body weight range using Devine, Hamwi, Robinson, and Miller formulas. See range across multiple methods — free online tool.

About Health

11 health and fitness calculators based on clinically validated formulas — including Mifflin–St Jeor, Harris–Benedict, WHO BMI standards, and Katch-McArdle. Estimate your TDEE, BMI, calorie needs, ideal weight, body fat percentage, pregnancy dates, and hydration requirements — privately, in your browser, with no data shared with any server. For medical decisions, always consult a qualified healthcare professional.

Also explore:

🧮 Calculators (28)🤖 AI & Productivity (7)

Frequently Asked Questions

Are the health calculators medically accurate?

The calculators use peer-reviewed, clinically validated formulas from recognised health authorities: WHO for BMI, Mifflin–St Jeor for TDEE (recommended by the Academy of Nutrition and Dietetics), and ACOG guidelines for pregnancy dating. All formula sources are listed on our Methodology page. Results are population-based estimates — individual results vary. These tools are not a substitute for professional medical advice.

Is my health data stored or shared?

No. All calculations run entirely in your browser. No health data — weight, height, age, medical information — is transmitted to any server, stored, or shared with any third party.

Can I use these calculators to diagnose a medical condition?

No. These calculators provide informational estimates based on statistical formulas, not medical diagnosis. For any health concern, always consult a qualified healthcare professional. The results are a starting point for conversation, not a clinical assessment.

Which units do the health calculators support?

All health calculators support both metric (kilograms, centimetres) and imperial (pounds, feet/inches) units. Switch between them using the unit selector in each tool. Conversion is handled automatically.