BMI Calculator
Runs in your browser — your data is never uploaded.
Calculate Body Mass Index from your weight in kilograms and height in centimetres, along with the standard underweight, normal, overweight and obese category. BMI is a quick screening figure, not a diagnosis. The result updates instantly as you type.
How to use BMI Calculator
- 1
Enter your weight in kilograms.
- 2
Enter your height in centimeters.
- 3
The result updates automatically.
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Frequently asked questions
What’s the formula for BMI?+
BMI is your weight in kilograms divided by the square of your height in metres (kg ÷ m²). A 70 kg person 1.75 m tall has a BMI of about 22.9, which falls in the normal range.
What are the BMI category ranges?+
Under 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30+ is obese — the standard WHO adult ranges.
Is BMI an accurate health measure?+
BMI is a simple screening tool based only on weight and height — it doesn’t account for muscle mass, body composition, age, or sex, so it’s not a diagnosis. Consult a healthcare provider for a full assessment.
Is my data uploaded anywhere?+
No. The calculation runs entirely in your browser — nothing is sent to a server.