Sumyard

Adult BMI calculator

Calculate body mass index for adults 20 and older, with context and limitations.

Jump to result

For adults age 20 and older. Children and teenagers need an age-specific assessment.

Your inputs

Updates as you type

body mass index (kg/m²)

22.9

Adult screening category
Healthy weight
Height
175 cm
Weight
70 kg

For adults 20 and older. Category uses the unrounded value. BMI is one screening measure, not a diagnosis or a personal weight recommendation.

Calculations happen in your browser. Saving is optional.

How to use this tool

Choose metric or US units and enter height, weight and age for an adult aged 20 or older.

Read the screening context with the number. BMI does not distinguish muscle from fat and is not a personal weight recommendation.

BMI = weight in kilograms / (height in meters)²

Worked example

22.9 · body mass index (kg/m²)

Fixed example using the settings below. Monetary examples use USD; dates and times use their stated reference values. This example stays unchanged when you edit your calculation.

Example inputs
  • Units: Metric (cm and kg)
  • Height (cm): 175
  • Weight (kg): 70
  • Age (years): 30

Method illustration: At 175 cm and 70 kg, BMI is approximately 22.9. Adult categories use the unrounded BMI.

Assumptions and limits

  • For adults age 20 and older. Children and teenagers need an age-specific assessment.
  • BMI is a screening measure, not a diagnosis. It does not distinguish muscle from fat or provide a personal target weight.
  • Pregnancy and other individual circumstances affect interpretation. Consider medical history and other health measures with a healthcare professional.

Method reference: CDC adult BMI calculator and category ranges

Check or report a result

Check the units, selected calculation and assumptions first. Compare the fixed example above with your inputs to identify what changed.

Report a calculation issue with the page address, hypothetical inputs, result displayed and result expected. Do not include passwords, bank details or other private information.