BMI Calculator
Work out your Body Mass Index from your height and weight.
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your BMI
Understanding your result:
- Under 18.5 — underweight; may signal undernutrition
- 18.5–24.9 — healthy weight for most adults
- 25–29.9 — overweight; a closer look may help
- 30 and above — obese; linked to higher health risks
BMI is a general guide, not a diagnosis. It cannot tell muscle from fat. For a full picture, speak with a doctor. Read our full BMI guide.
What BMI means
Body Mass Index is a quick way to see whether your weight sits in a healthy range for your height. It is worked out by dividing your weight in kilograms by your height in metres squared. The result places you in one of four broad bands.
- Below 18.5 — underweight
- 18.5 to 24.9 — healthy weight
- 25 to 29.9 — overweight
- 30 and above — obese
BMI is a general screening guide, not a diagnosis. It does not separate muscle from fat, so very muscular people may read high while still being healthy. Use it as a starting point and talk to a doctor about your own situation. You can read more in our full BMI guide.
Common questions
- Is BMI accurate for everyone?
- No. It works well for general population trends but can mislead for athletes, older adults, and some ethnic groups.
- What is a healthy BMI?
- For most adults, 18.5 to 24.9 is considered healthy.