BMI Calculator

Calculate BMI

Adult BMI screening estimate

For adults age 20 or older. Enter your own measurements to calculate a result.

Values stay in the URL so this calculation can be bookmarked or shared.

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Adult BMI estimate

CDC adult screening categories

  • UnderweightBelow 18.5
  • Healthy Weight18.5–24.9
  • Overweight25.0–29.9
  • Obesity30.0 or greater

Adult Body Mass Index screening calculator using height and weight.

Sourced factors

Formula

BMI = weight (kg) / height (m)²

Calculations use the central unit catalog and preserve precision until the result is formatted.

Frequently asked questions

What does adult BMI measure?

BMI is a calculated screening measure that relates an adult's weight to their height. It is one health indicator and does not directly measure body fat.

Who is this BMI calculator for?

This calculator uses adult categories for people age 20 or older. Children and teens require age- and sex-specific BMI percentiles.

Is a BMI result a medical diagnosis?

No. BMI is a screening measure, not a diagnosis, and should be considered alongside other individual health factors with a qualified professional.

Accuracy & transparency

Sources & methodology

Calculations keep full numeric precision until display formatting. These references describe the definitions, variants or factors used; links do not imply affiliation.

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