Formula guide

BMI Calculator formula

BMI is calculated by dividing weight by height squared. In metric terms the formula is kilograms divided by meters squared. In US-style usage, calculators convert feet, inches, or pounds into the equivalent metric calculation behind the scenes.

How the input values are used

Weight (kg)

The numeric value in kg is used in the calculation; keep units consistent.

Height (cm)

The numeric value in cm is used in the calculation; keep units consistent.

How to interpret the result

  • The result uses Weight (kg) and Height (cm). Change one variable at a time to compare its effect on the outcome.
  • Health and fitness values are estimates, not a substitute for measurements or clinical advice.
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