BMI calculator
This BMI calculator works out your body mass index from your height and weight and shows which adult category it falls in, using the categories published by the US Centers for Disease Control and Prevention (CDC).
Calculate your BMI
Enter your details. Nothing is saved or sent anywhere.
Your BMI
25.7
Overweight
Estimates for healthy adults, not medical advice.
Adult BMI categories used by this BMI calculator
For adults 20 and older (CDC, page dated March 19, 2024):
- Underweight: less than 18.5
- Healthy weight: 18.5 to less than 25
- Overweight: 25 to less than 30
- Obesity: 30 or greater
A worked example
At 165 cm and 70 kg: 70 ÷ (1.65 × 1.65) = 25.7.
What BMI doesn't tell you
- How much of your weight is muscle, fat or bone.
- Where you carry fat; waist size adds useful information.
- Your fitness, blood pressure, blood sugar or cholesterol.
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Frequently Asked Questions
Weight in kilograms divided by height in metres squared. In pounds and inches, it is weight ÷ height² × 703.
It is a quick screening measure, not a diagnosis. It doesn't separate muscle from fat or show where fat is carried, so a muscular person can score as overweight. Use it alongside other measures and talk to a health professional about the result.
No. These categories are for adults 20 and older. Children and teens are assessed with BMI-for-age percentiles instead.