BMI Calculator
100% PrivateCalculatorsCalculate body mass index from height and weight in metric or imperial units.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
22.9: Normal weight
WHO adult bands: below 18.5 underweight, 18.5 to 24.9 normal weight, 25 to 29.9 overweight, 30 and above obesity. BMI is a general screening measure only. It does not distinguish muscle from fat and is not a diagnosis; talk to a clinician about your own health.
- 1Choose metric (kilograms and centimetres) or imperial (pounds and inches).
- 2Enter your weight and height.
- 3Read your BMI to one decimal place and the band it falls in.
BMI = 70 / (1.75 x 1.75) = 22.9, which sits in the normal weight band (18.5 to 24.9). Switch to imperial and enter pounds and inches instead; the tool converts with the exact factors before applying the same formula.
- BMI is a screening measure for adults. It does not distinguish muscle from fat, so athletes often score high and older adults can score normal while carrying risk.
- The WHO bands are not designed for children or teenagers, whose BMI is read against growth charts instead.
- This is general information, not medical advice; only a clinician who knows your history can assess your health.
Weight in kilograms divided by height in metres squared. This tool converts imperial inputs to metric first, using the exact definitions (1 lb = 0.45359237 kg, 1 inch = 2.54 cm).
About this tool
The BMI Calculator computes body mass index from height and weight in metric or imperial units and places it in the standard World Health Organization adult bands. It gives a quick, honest screening number, and says plainly what BMI can and cannot tell you.
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