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BMI Calculator

BMI is weight in kilograms divided by height in meters squared. It is a population screening tool, does not distinguish muscle from fat, and does not replace a clinician; interpret cautiously for athletes, pregnancy, older adults and children.

Updated 2026-10-31 · Formula shown · No signup
--BMI ·
--Category ·
--Healthy min · kg
--Healthy max · kg

Estimates only; verify on site before ordering or building.

Example

ItemValueUnit
Height170cm
Weight70kg
BMI24.2
Categorynormal
Healthy min53.5kg
Healthy max72kg

Where people go wrong

  • Using centimeters directly in the formula.
  • Treating BMI as body-fat percentage.
  • Applying adult cutoffs to athletes, pregnancy or children.

FAQ

Does a high BMI mean fat?

Not necessarily; muscular people can have a high BMI, so check body fat and waist.

Does it work for children?

Children use age- and sex-specific percentiles, not fixed adult cutoffs.

Is this medical advice?

No; consult a clinician or dietitian for health concerns.