BMI
Enter your weight in kilograms and height in centimeters to get your body mass index and the standard WHO category (underweight, normal, overweight or obese). BMI is a quick population screen — it ignores muscle, frame and body composition. This is informational only and not medical advice.
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💡 Good to know: BMI was devised by a mathematician to study populations, not individuals — it ignores muscle, so athletes often read as "overweight."
Worked example
BMI: 23.671254 · Category: Normal
Learn the method
Inputs
- Weight kg
75 - Height cm
178
Frequently asked
What BMI is considered normal?
A BMI from 18.5 to under 25 is labelled 'normal' here; under 18.5 is underweight, 25–30 overweight and 30+ obese.
Is BMI accurate for athletes?
Not really — muscle weighs more than fat, so very muscular people can read as 'overweight' despite low body fat. Use body-fat estimates alongside it.