How to Use the BMI Calculator
Enter your weight and height. Toggle between metric (kg/cm) and imperial (lbs/ft-in). BMI calculates instantly. See your category, healthy weight range, and Asian-specific thresholds.
BMI Calculator Formula
BMI = weight_kg / (height_m)²Example Calculation
Weight 70 kg, height 170 cm:
BMI = 70 / (1.70)² = 70 / 2.89
BMI = 24.2 — Normal weight (Asian threshold: borderline overweight at ≥23)
What BMI Measures — and What It Misses
Body Mass Index is a single number derived from your weight and height. It is a screening tool, not a diagnosis: it estimates whether your weight is in a healthy range for your height across a large population, but it knows nothing about your individual body composition. Because it cannot tell muscle from fat, a muscular athlete and a sedentary person can share the same BMI while being in completely different health. Treat BMI as a useful first signal that prompts a closer look, not as a verdict.
Why Indians Need Lower BMI Thresholds
This is the single most important thing for Indian users to understand. The standard WHO BMI cut-offs (overweight at 25, obese at 30) were calibrated on European populations. People of South Asian descent tend to carry more body fat — and more dangerous visceral fat around the organs — at a given BMI. As a result, health risks like type 2 diabetes and heart disease begin at a lower BMI.
- Healthy range for Indians: 18.5 to 22.9 (versus 18.5–24.9 standard).
- Overweight: 23 and above (versus 25 standard).
- Obese: 27.5 and above (versus 30 standard).
In practice this means a BMI of 24 — comfortably "normal" by the standard chart — already falls in the overweight zone for an Indian adult. This calculator shows both thresholds so you can read your result against the one that applies to you.
Pair BMI With Waist Measurement
Because BMI ignores where fat sits, the most useful thing you can add is a simple waist measurement. Fat carried around the abdomen is metabolically riskier than fat on the hips and thighs. For Indians, a waist above 90 cm for men and 80 cm for women signals elevated risk regardless of BMI. Measuring your waist-to-hip ratio alongside BMI gives a far more honest picture than either number alone — a "normal" BMI with a high waistline still warrants attention.
Using Your BMI Sensibly
If your BMI falls outside the healthy band, the response is not crash dieting but small, sustainable changes — and a conversation with a doctor if you are well above or below the range. BMI is also a poor guide for children, pregnant women, the elderly, and serious athletes, who all need specialised assessment. For a typical adult, though, tracking BMI over time — alongside waist size, energy levels, and how your clothes fit — is a reasonable, free way to keep an eye on a meaningful health trend. To turn a target weight into a daily calorie plan, pair this with the TDEE calculator.
Frequently Asked Questions
What is a healthy BMI range?
Standard BMI ranges: below 18.5 = Underweight, 18.5–24.9 = Normal, 25–29.9 = Overweight, 30+ = Obese. For people of Asian descent (including Indians), health risks start at lower BMI — overweight threshold is 23, obese is 27.5.
Is BMI an accurate measure of health?
BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat, and does not account for fat distribution. Use BMI alongside waist circumference and WHR for a complete picture.