BMI Calculator - free online tool
Calculate body mass index from your weight and height in metric or imperial units.
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Privacy: this tool runs in your browser. Your input is not sent to our server.
How to use BMI Calculator
Choose units, then enter weight and height.
Example
70 kg at 175 cm gives a BMI of 22.9.
Frequently asked questions
Is BMI accurate for everyone?
No. It does not separate muscle from fat and does not apply to children. Ask a health professional for advice.
What are the adult ranges?
Under 18.5 underweight, 18.5 to 24.9 normal, 25 to 29.9 overweight, 30 and above obesity.