Body Mass Index (BMI) Calculator
Determine your body mass index instantly. Enter your height and weight to find out if you're at a healthy weight. Free online BMI calculator.
Body Mass Index (BMI) Calculator
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What is the body mass index (BMI)?
Body Mass Index (BMI) is a simple index calculated from height and weight. It helps classify whether a person has underweight, normal weight, overweight, or obesity — and is widely used as a screening tool by WHO and other health organisations.
How is BMI calculated?
BMI is calculated by dividing the weight in kilograms by the square of the height in meters.
BMI = weight (kg) / height (m)^2
What is the normal range for BMI?
The normal BMI range is 18.5–24.9. Full classification per ACE Fitness:
- Underweight — below 18.5
- Normal weight — 18.5–24.9
- Overweight — 25–29.9
- Obesity class I — 30–34.9
- Obesity class II — 35–39.9
- Obesity class III — 40 and above