The body mass index (BMI) was born in the 19th century as a statistical formula to study populations, not individuals. That is why it is so useful for comparing groups and so limited for judging a specific person. Understanding what it measures (and what it does not) helps you use it well: as a first filter, not a diagnosis.
The BMI categories (WHO, adults)
| BMI (kg/m2) | Category |
|---|---|
| Under 18.5 | Underweight |
| 18.5 - 24.9 | Normal weight |
| 25.0 - 29.9 | Overweight |
| 30.0 or more | Obesity |
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In short: BMI is a useful, convenient screening tool, but a single number does not define your health. Use it as a starting point, complement it with waist circumference and real health markers, and do not let a figure cause you anxiety. What truly matters are your habits: eating well, moving and keeping muscle. Renzy helps you with that, which is what moves the needle.
Renzy calculates all of this for you
Get your number in a minute, no account needed.
BMI calculatorIn your browser, nothing to install
Or try it with a photo of your plate
Start your 7-day trialApp: 7 days free · card required · cancel anytime
