Free BMI Calculator
Check if you're a healthy weight for your height using our instant, regulation-safe Body Mass Index tool.
Calculate Your BMI
Body Mass Index (Metric & Imperial)
What is Body Mass Index (BMI)?
Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in metres squared. A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9.
Why BMI Matters
High BMI is a risk factor for diseases such as heart disease, high blood pressure, type 2 diabetes, gallstones, breathing problems, and certain cancers.
Limitations of BMI
BMI may overestimate body fat in athletes and others who have a muscular build. It may underestimate body fat in older persons and others who have lost muscle.
BMI Categories Table (WHO vs. Indian ICMR Guidelines)
Standard WHO cutoff thresholds are calibrated for general Western populations. The Indian Council of Medical Research (ICMR) and WHO Asia-Pacific recommend lower BMI thresholds for South Asians to screen for earlier metabolic and cardiovascular risks.
| Classification | WHO Standard (kg/m²) | Asian / Indian ICMR (kg/m²) |
|---|---|---|
| Underweight | < 18.5 | < 18.5 |
| Normal / Healthy | 18.5 – 24.9 | 18.5 – 22.9 |
| Overweight | 25.0 – 29.9 | 23.0 – 24.9 |
| Obese | ≥ 30.0 | ≥ 25.0 |
Frequently Asked Questions
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What to Do Next
Based on your BMI, here are recommended next steps for your health journey.