Health
BMI Calculator
Body Mass Index — a quick screening tool that compares your weight to your height. Standard WHO classification with visual scale, plus how many kgs you'd need to gain or lose to reach the normal range.
Inputs
BMI scale
Where you fall in the WHO classification
BMI is a screening tool, not a diagnosis. Athletes with high muscle mass may register as overweight without being unhealthy. Consult a doctor for a full assessment.
BMI categories (WHO)
| BMI | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal |
| 25.0 – 29.9 | Overweight |
| 30.0 – 34.9 | Obese (Class I) |
| 35.0 – 39.9 | Obese (Class II) |
| ≥ 40 | Obese (Class III) |
Limitations
BMI doesn't distinguish muscle from fat, doesn't account for body composition or fat distribution. Athletes can register as overweight without being unhealthy. Asian populations have higher health risks at lower BMIs — Indian / South Asian guidance often suggests <23 as the upper "normal" cut-off.
For a more complete picture, also consider waist circumference, body fat %, and metabolic markers (blood sugar, lipids, BP). Use BMI as one signal, not the only one.
Formula
BMI = weight (kg) / height (m)²