BMI Calculator
Calculate your Body Mass Index using your height and weight.
Result
Enter your height and weight to calculate BMI.
Calculate your Body Mass Index using your height and weight.
Body Mass Index (BMI) compares your weight with your height to give a single number that is commonly used as a quick screening guide. Enter your weight in kilograms and your height in centimetres and the calculator returns your BMI and the category it falls into. BMI is only a general indicator and does not replace advice from a doctor.
BMI equals weight in kilograms divided by the square of height in metres.
Not always. It does not separate muscle from fat, so athletes, older adults and children may need a different assessment. Talk to a doctor for health decisions.
Body Mass Index is calculated as weight in kilograms ÷ (height in metres)². Enter your weight in kilograms and your height in centimetres, and the tool converts the height to metres and shows your BMI and category.
The categories used here are the common adult ranges: below 18.5 is underweight, 18.5 to 24.9 is normal weight, 25 to 29.9 is overweight, and 30 or above is obesity.
A person who weighs 70 kg and is 170 cm tall has a BMI of 70 ÷ (1.70 × 1.70) = 24.22, which falls in the normal weight range.
The same height at 80 kg gives a BMI of 27.68, which falls in the overweight range.
For most adults, a BMI between 18.5 and 24.9 is considered the normal range, but individual health depends on many other factors.
No. It can overestimate fat in muscular people and underestimate it in older adults who have lost muscle.
The tool needs centimetres. Multiply feet by 30.48 and inches by 2.54, then add them. For example, 5 ft 8 in is about 173 cm.
This tool is for information only and is not medical advice. Speak with a doctor or a qualified dietitian before making health decisions.