BMI Calculator (kg and cm)
Work out your body mass index from weight in kilograms and height in centimetres.
Your BMI
Healthy weight, lower end (kg)
Healthy weight, upper end (kg)
The formula
BMI = weight in kg / (height in metres)^2. Common adult ranges are under 18.5 underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight and 30 or more obesity.
Example: 70 kg at 175 cm gives a BMI of 22.86. BMI is a simple screening number and does not measure body fat, so talk to a doctor about your health.
Frequently asked questions
Is BMI accurate for everyone?
No. Muscle, age and body type affect it, and ranges can differ for some groups.
Is this medical advice?
No. It is general information only.
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Last updated October 2026. For information only, not financial advice.