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Glossary Health & Fitness

BMI (body mass index)

BMI is body weight in kilograms divided by height in metres squared, a screening number for whether weight is in a healthy range.

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In more detail

70 kg at 1.75 m gives 22.86. Adult bands: under 18.5 underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight, 30 or more obese. It ignores muscle and fat distribution, so it is not a diagnosis.

Try these tools

BMI Calculator

Calculate your Body Mass Index (BMI) and understand your health status with our interactive tool.

Healthy Weight Calculator

Calculate your healthy weight range based on your height using the WHO healthy BMI band (18.5-25).

Ideal Weight Calculator

Free ideal weight calculator using Hamwi, Devine, Robinson & Miller formulas.

Overweight Calculator

Calculate how much excess weight you're carrying above the healthy BMI ceiling, plus a realistic safe weight-loss timeline.

See also

  • Glossary Body fat percentage
    Body fat percentage is the share of your total weight that is fat, estimated from tape measurements or skinfolds.
  • Glossary Waist-to-hip ratio
    The waist-to-hip ratio divides waist circumference by hip circumference, a measure of where body fat is carried.
  • Cheat sheet Health Formulas Cheat Sheet
    BMI, BMR, TDEE, macros, body surface area, heart-rate targets, one-rep max and blood-pressure formulas.
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