Your body.
By the numbers.
Five free, science-based health calculators. No sign-up needed.
BMI Calculator
Body Mass Index using WHO standards. Valid for adults 18–65.
Enter your height and weight to see your BMI.
Calorie & TDEE Calculator
Mifflin-St Jeor equation — the gold standard for daily calorie estimation.
Fill in your details to calculate your daily calorie needs.
Macro Calculator
Protein, carb and fat targets based on your calorie goal. Minimum safe intake is 1,200 kcal/day.
Enter your calorie target and goal to get your macro breakdown.
Ideal Body Weight
Compares 4 established medical formulas: Devine, Robinson, Miller, and Hamwi.
Enter your height to see your ideal weight range across 4 formulas.
Daily Water Intake
Based on body weight, activity level and climate. Recommended by sports medicine guidelines.
Enter your details to calculate your daily water intake.
Understanding BMI
A screening tool — 18.5 to 24.9 is the healthy range by WHO standards. BMI does not measure body fat directly; athletes and muscular individuals may score higher without excess fat.
What is TDEE?
Total Daily Energy Expenditure is the total calories you burn each day. Eat below it to lose weight, above it to gain muscle, and at it to maintain your current weight.
Why Macros Matter
Protein builds and preserves muscle. Carbohydrates fuel activity and the brain. Fats support hormone production. Hitting the right balance for your goal makes the biggest difference.
Hydration and Health
Even 1–2% dehydration measurably impairs focus and physical performance. Thirst is a late signal — drink consistently throughout the day rather than waiting until you feel thirsty.