BMI Categories (WHO)
- •Underweight: below 18.5 · Normal: 18.5-24.9.
- •Overweight: 25-29.9 · Obese: 30 and above.
- •Formula: weight (kg) ÷ height (m)².
- •BMI is a screening tool, not a diagnosis. It does not measure body fat directly.
The Real Problem This Solves
People judge their health by the weighing scale alone, ignoring whether that weight is healthy for their height.
BMI gives a quick, standardised reality check. This calculator shows where you stand on the WHO scale.
How BMI Works
BMI divides your weight in kilograms by your height in metres squared. The result maps to a category that flags potential health risk.
Example: Sneha weighs 70 kg and is 170 cm tall. Her BMI = 70 ÷ (1.7)² = 24.2, in the healthy "Normal weight" band. At 85 kg she'd be 29.4, in the "Overweight" band, a signal to act.
| Weight (at 170 cm) | BMI | Category |
|---|---|---|
| 52 kg | 18.0 | Underweight |
| 70 kg | 24.2 | Normal |
| 85 kg | 29.4 | Overweight |
Frequently Asked Questions
Is BMI accurate for everyone?
It is a useful general screen but does not distinguish muscle from fat. Very muscular people may show a high BMI despite being healthy. Use it alongside waist size and body fat.
What is a healthy BMI?
The WHO considers 18.5 to 24.9 as the normal, healthy range for most adults.
Related Calculators
Know your BMI?
BMI is just the start. To plan diet and exercise, find how many calories your body actually needs with our Calorie (TDEE) Calculator.
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