Body Measurement Calculators
Free BMI, BMR, body fat, and ideal weight calculators. Understand your body composition using WHO-standard, clinically validated formulas.
Body Measurement Calculators - Your Health Baseline in Numbers
Before you can improve your health, you need to measure it. These calculators translate physical attributes into standardised metrics that doctors, trainers, and nutritionists use every day - all based on clinically validated formulae and WHO reference classifications.
Four Body Calculators
BMI Calculator - Body Mass Index (weight in kg ÷ height in m²). WHO classifies adults as: underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30). Supports metric and imperial inputs. Also shows the Asia-Pacific classification with lower thresholds (overweight at 23.0) relevant for Indian users.
BMR Calculator - Basal Metabolic Rate: calories your body burns at complete rest. Uses the Mifflin–St Jeor equation (most accurate for general use per the American Dietetic Association). Multiply BMR by your activity factor to get TDEE - feed that into the Calorie Deficit Calculator to set a safe fat-loss target.
Body Fat Calculator - Estimates body fat percentage using the US Navy circumference method (neck, waist, and hips). Accuracy ±3–4% vs. DEXA. Shows ACE body fat category: essential, athletic, fit, average, or obese.
Ideal Weight Calculator - Returns a healthy weight range for your height using four clinical formulas (Devine, Hamwi, Robinson, Miller) - showing the spread rather than a single arbitrary number.
How These Four Calculators Work Together
Start with the BMI Calculator for a quick screen. Add the Body Fat Calculator for a more complete picture - a muscular athlete may have “overweight” BMI but healthy body fat. Use the BMR Calculator to find your calorie baseline, then check the Ideal Weight Calculator to understand what a healthy weight range looks like for your height.
Frequently Asked Questions
What is a healthy BMI range for Indians?
The WHO standard normal range is 18.5–24.9. However, research shows South Asians carry higher metabolic risk at lower BMI values. The BMI Calculator shows both the WHO classification and the Asia-Pacific classification (overweight at 23.0, obese at 27.5).
Which BMR formula is most accurate?
The Mifflin–St Jeor equation shows the smallest mean error in multiple studies, especially for overweight individuals. The BMR Calculator uses Mifflin–St Jeor by default and also shows the Harris-Benedict result for comparison.
How do I measure correctly for the body fat calculator?
Waist: at the narrowest point, ~1 inch above the navel. Neck: just below the larynx, perpendicular to the neck axis. Hips (women only): at the widest point. Take three readings and average them. See measurement guidance on the Body Fat Calculator page.
Is ideal weight the same as target weight for fitness goals?
Not necessarily. The Ideal Weight Calculator gives population-based norms - your personal optimal weight depends on muscle mass, bone density, and athletic goals. Use it as a reference, not a rigid prescription.