What is BMI?
Body Mass Index (BMI) is a simple measure that uses your height and weight to estimate whether you're in a healthy weight range. It's calculated as your weight in kilograms divided by the square of your height in metres.
BMI = weight (kg) ÷ height (m)²
BMI categories
- Below 18.5 — Underweight
- 18.5 – 24.9 — Normal (healthy)
- 25 – 29.9 — Overweight
- 30 and above — Obese
Frequently asked questions
Is BMI accurate for everyone?
BMI is a useful general guide but doesn't measure body fat directly. Very muscular people may have a high BMI while being healthy. Treat it as a starting point, not a diagnosis.
What's a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy for most adults. For some Asian populations, health risks can rise from around 23, so consult a doctor for personal advice.