⚖️ BMI Calculator
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BMI ranges
| Category | BMI range |
|---|---|
| Underweight | Below 18.5 |
| Healthy weight | 18.5 – 24.9 |
| Overweight | 25 – 29.9 |
| Obese (Class I) | 30 – 34.9 |
| Obese (Class II+) | 35 and above |
Understanding your BMI
What BMI measures
BMI (Body Mass Index) is a simple calculation using your height and weight to estimate whether you're in a healthy weight range for your height. It's widely used as a screening tool — but it's a starting point, not a diagnosis.
BMI limitations
BMI doesn't distinguish between muscle and fat. Athletes and very muscular people often show a high BMI despite being in excellent health. It also doesn't account for age, sex, ethnicity, or where fat is stored on the body. Always consider BMI alongside other health indicators.
What to do with your result
If your BMI is outside the healthy range, it's worth speaking with your doctor who can give personalised advice based on your full health picture.
Frequently asked questions
How is BMI calculated? ▼
BMI = weight (kg) ÷ height (m)². For imperial: BMI = (weight in lbs × 703) ÷ height in inches².
What is a healthy BMI? ▼
A BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is considered obese.
Is BMI accurate? ▼
BMI is a useful screening tool but has limitations — it doesn't account for muscle mass, age, sex or body fat distribution. Use it as a guide alongside other health checks.
What BMI is considered obese? ▼
A BMI of 30 or above is classified as obese. Class I obesity is 30–34.9, Class II is 35–39.9, and Class III (severe obesity) is 40 and above.