BMI Calculator
Calculate body mass index from your height and weight.
About the BMI Calculator
Calculate body mass index from your height and weight.
BMI Calculator computes your Body Mass Index from height and weight using the standard WHO formula. Enter your measurements in metric or imperial units and instantly see your BMI value and standard classification range.
- Type
- Calculator
- Method
- WHO + South-Asian cutoffs; returns a category, not just a number
- Runs in
- Your browser — no account, no install
- Price
- Free
- Results
- Instant, with plain-English interpretation
BMI Calculator
Frequently asked questions
According to the WHO, a BMI of 18.5–24.9 is normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese. These thresholds may vary slightly by ethnicity and age.
No. BMI does not distinguish fat mass from muscle mass. Athletes often have high BMIs despite low body fat. BMI is a population screening tool, not a precise individual health measure.
BMI = weight(kg) / height(m)². In imperial: BMI = (weight in lbs × 703) / height in inches². Both give identical results when units are correctly converted.
Child BMI is interpreted differently — compared against age and sex-specific growth charts rather than fixed thresholds. This calculator is designed for adults 18 and older.
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