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BMI Calculator
Utility
Calculate Body Mass Index from height and weight in metric or imperial units.
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BMI Calculator
Enter your height and weight above to calculate your BMI and see its healthy-range category.
Standard BMI (kg/m² metric, 703 × lb/in² imperial) rounded to one decimal, with Underweight, Normal, Overweight, and Obese bands. Does not adjust for age, sex, or body composition.
See moreSee less about the BMI Calculator
Examples
Imperial inputs
Height 69 in · Weight 154 lb → BMI 22.7 (Normal)Imperial uses 703 × lb ÷ in². BMI does not separate muscle from fat, so a muscular person can land in a higher category than their body fat would suggest.
Overweight band
Height 180 cm · Weight 90 kg → BMI 27.8 (Overweight)Bands: under 18.5 Underweight, 18.5 to under 25 Normal, 25 to under 30 Overweight, 30 and above Obese. Height must be above 0 and at most 1000 cm; weight at most 10,000 kg.
Key features
- Metric and imperial inputs
- One-decimal BMI result
- Standard weight category
Related tools
Quick answers for BMI Calculator
Does it support metric and imperial units?
Yes. Metric takes height in centimeters and weight in kilograms (kg / m squared). Imperial takes inches and pounds and uses the 703 multiplier, so you do not convert units first.
What do the category labels mean?
The BMI is rounded to one decimal. Below 18.5 is Underweight, 18.5 to under 25 is Normal, 25 to under 30 is Overweight, and 30 or above is Obese.
Does it account for age, sex, or muscle mass?
No. It computes only the weight-to-height ratio. It does not adjust for age, sex, or body composition, so it cannot tell muscle from fat.
Is the result a diagnosis?
No. BMI is a rough screening number. It is not a diagnosis, and health decisions should involve a clinician who can look at more than one measure.