BMI is a population-level screen and not a diagnosis. It does not account for muscle mass or fat distribution; pair with other measures and medical guidance.

BMI Calculator

Q: How is BMI calculated?

BMI = weight(kg)/height(m)^2. In Imperial units, BMI = 703 × weight(lb)/height(in)^2.

Q: BMI vs Body Fat — what’s the difference?

BMI uses height and weight; body fat % measures adipose tissue directly. Athletes can have high BMI but healthy body fat.

Q: Should kids use this calculator?

For under-20s, use age- and sex-specific BMI percentiles. This tool is for adults.

BMI Calculator

Metric/Imperial • age/sex nuance • accessible • shareable result

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FAQs

How is BMI calculated?

BMI = weight(kg) / height(m)². In Imperial units, BMI = 703 × weight(lb) / height(in)².

How accurate is BMI?

It’s a population-level screen. It doesn’t account for muscle mass, bone density, or fat distribution. Pair it with waist-to-height ratio, body fat %, and clinical guidance.

BMI vs Body Fat — what’s the difference?

BMI uses height & weight only. Body fat % estimates adipose tissue directly (via calipers, BIA, DEXA). Someone muscular can have a high BMI but a healthy body fat %.

Should kids use this calculator?

For under-20s, clinicians use age- and sex-specific BMI percentiles. This tool is for adults.

BMI Calculator

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