BMI Calculator
Work out your body mass index (BMI) in seconds. Enter your height and weight: we interpret the result and show you your healthy weight range.
Calculate your BMI
Enter your height and weight to get your BMI and what it means.
BMI categories (WHO standard)
| Category | BMI (kg/m²) |
|---|---|
| Severe thinness | BMI < 16.5 |
| Moderate thinness | BMI 16.5 – 17 |
| Underweight (mild thinness) | BMI 17 – 18.5 |
| Normal weight | BMI 18.5 – 25 |
| Overweight | BMI 25 – 30 |
| Obesity class I (moderate) | BMI 30 – 35 |
| Obesity class II (severe) | BMI 35 – 40 |
| Obesity class III (morbid) | BMI ≥ 40 |
How is BMI calculated?
Body mass index is calculated from your weight and height, using a simple, universal formula.
BMI = weight (kg) ÷ height² (m)
Measure your height
Stand straight, barefoot, back against the wall, and note your height in metres (e.g. 1.72 m).
Weigh yourself
Weigh yourself preferably in the morning, on an empty stomach, on a reliable scale, and note your weight in kilograms.
Apply the formula
Divide your weight by your height squared. Example: 68 ÷ (1.72 × 1.72) ≈ 23 : a normal BMI.
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Frequently asked questions
What is BMI (body mass index)?
BMI is an indicator that relates your weight to your height to estimate your body corpulence. It is calculated by dividing weight (in kg) by height squared (in m). It is the reference tool used by the WHO to position a weight against a standard.
What is the ideal BMI?
A BMI between 18.5 and 25 is considered normal for an adult. Below that is thinness; above 25 is overweight, and above 30 is obesity. The ideal BMI is a range, not a single number.
How do I calculate my BMI myself?
Divide your weight in kilos by your height in metres squared. For example, for 68 kg and 1.72 m: 68 ÷ (1.72 × 1.72) ≈ 23. Our calculator does this automatically and interprets the result for you.
Is BMI reliable for everyone?
No. BMI doesn't distinguish fat mass from muscle mass and ignores body shape. It is not suitable for children, pregnant women, the elderly or very muscular athletes. It's a reference point, not a diagnosis.
Is BMI different for men and women?
The BMI formula and thresholds are identical for adult men and women. However, at the same BMI, body composition (body fat percentage) often differs between the sexes, which BMI does not measure.
Is this tool free?
Yes, the BMI calculator is 100% free and available without sign-up. None of the values you enter are stored: the entire calculation runs directly in your browser.