BMI Calculator
Enter your height and weight to get your body mass index, the WHO weight category and a healthy weight range for your height.
BMI Calculator
How to use the BMI Calculator
- Choose metric or imperial units.
- Enter your height and weight.
- Press "Calculate BMI" to see your BMI, category and healthy range.
About this tool
Body mass index (BMI) is your weight in kilograms divided by your height in metres squared. The World Health Organization uses it to group adults into underweight (below 18.5), normal weight (18.5 to 24.9), overweight (25 to 29.9) and obese (30 and above).
BMI is a quick screening number, not a diagnosis. It does not separate muscle from fat, and it can read differently for athletes, older adults and some ethnic groups. This calculator is for adults aged 18 and over. For personal health advice, please talk to a doctor or dietitian.
Frequently asked questions
What is a healthy BMI?
The WHO healthy range for adults is 18.5 to 24.9.
Is BMI accurate for athletes?
Not always. Muscle weighs more than fat, so muscular people can have a high BMI without excess body fat.
Can I use this for children?
No. Children and teenagers use BMI-for-age percentiles. Ask a pediatrician.