BMI Calculator
Calculate your Body Mass Index from height and weight, in metric or imperial units, and see your weight category.
Calculate your BMI
Choose your preferred units, then enter your height and weight.
Result
Formula used
BMI = weight (kg) ÷ height (m)²
- Underweight
- BMI below 18.5
- Normal weight
- BMI 18.5 – 24.9
- Overweight
- BMI 25 – 29.9
- Obesity
- BMI 30 or above
How to use this calculator
- Select metric or imperial units.
- Enter your weight and height.
- Press Calculate to see your BMI and weight category.
FAQ
Frequently asked questions
What is BMI?
Body Mass Index (BMI) is a simple ratio of weight to height, used as a general screening tool for weight categories in adults.
What is the BMI formula?
BMI = weight in kilograms divided by height in meters squared (kg / m²).
What are the BMI categories?
Under 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30 or above is considered obesity.
Is BMI accurate for everyone?
BMI does not account for muscle mass, bone density, age or sex, so it is a general estimate rather than a diagnosis. It is not medical advice.
Can I use pounds and inches?
Yes. Switch to imperial units to enter your weight in pounds and height in feet and inches.