BMI Calculator
Enter your weight and height to get your body mass index. BMI is a quick screening measure, not a diagnosis.
Your details
Result
Your BMI
22.9
Normal weight
Normal weight
- Healthy weight for your height
- 56.7 – 76.3 kg
WHO categories
| BMI | Category |
|---|---|
| Under 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25 – 29.9 | Overweight |
| 30 and over | Obese |
- BMI is a screening tool, not a diagnosis. It doesn't account for muscle mass, age or body shape.
Good to know: For most adults, a BMI of 18.5 to 24.9 is classed as a healthy range. Muscle, age and body shape are not taken into account.
Please note: General estimate for information only. This is not medical advice, diagnosis or treatment, and it may not suit your age, health, medication or pregnancy. Never use it to make a medical decision. Talk to a doctor or other qualified health professional about your own situation, and in an emergency call your local emergency number.
About this tool
Calculate Body Mass Index from height and weight — used by health professionals and individuals to screen weight categories.
Formula
Metric: BMI = weight(kg) ÷ height(m)². Imperial: BMI = 703 × weight(lbs) ÷ height(in)².
Reference values
- BMI 18.5–24.9 = Normal weight
- BMI 25–29.9 = Overweight
- BMI ≥ 30 = Obese
Questions people ask
How is BMI calculated?
Weight in kilograms divided by height in metres squared. In imperial units: 703 × weight in pounds ÷ height in inches squared.
Is BMI accurate for everyone?
No. It can overestimate for muscular people and underestimate for people with low muscle mass. It is a starting point for a conversation.
What BMI ranges does the WHO use?
Under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30 and over obese.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: World Health Organization: BMI classification.
Spotted a mistake? Tell us and we'll check it. How we check our calculators