BMI Calculator — Check Your Body Mass Index
Calculate your BMI (Body Mass Index) instantly. Free online BMI calculator for adults — enter height and weight to check if you are underweight, normal or obese.
How to Use
- Select Metric (kg/cm) or Imperial (lbs/in) using the tab toggle at the top.
- Adjust your weight using the slider or type the value directly.
- Adjust your height — your BMI and weight category update instantly.
Formula
BMI (Metric) = Weight (kg) / Height² (m)
BMI (Imperial) = 703 × Weight (lbs) / Height² (inches)
BMI Categories: Underweight < 18.5 | Normal 18.5–24.9 | Overweight 25–29.9 | Obese ≥ 30
Example Calculation
Example: 70 kg weight, 170 cm height
| Calculation | Value |
|---|---|
| Height in metres | 1.70 m |
| BMI = 70 / 1.70² | 70 / 2.89 = 24.2 |
| BMI Category | Normal Weight |
Frequently Asked Questions
BMI (Body Mass Index) is a simple measure of body fat based on weight and height. It is used to screen for weight-related health problems.
BMI is a screening tool, not a diagnostic tool. It does not account for muscle mass, bone density, or fat distribution. Athletes may show high BMI due to muscle.
For adults, a BMI of 18.5–24.9 is considered healthy. For South Asians, WHO recommends adjusted cutoffs: 18.5–22.9 normal, 23–24.9 overweight risk.
A combination of calorie deficit, regular exercise, adequate sleep, and stress management is the most effective approach to reducing BMI.
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