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Adult BMI Calculator

Calculate an informational adult body-mass index. This free adult bmi calculator shows the calculation and its assumptions so you can compare your own figures.

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Your results

BMI24.49

Calculate an informational adult body-mass index.

CategoryWithin the standard adult BMI range

Assumptions and estimates

  • BMI = weight in kg / height in metres squared. WHO adult population cut-offs are 18.5, 25 and 30. BMI is an informational screening measure, not a diagnosis; it does not assess body composition, pregnancy or individual health.
  • Method: BMI = weight in kilograms ÷ height in metres squared.
  • For adults only. BMI is a population screening measure, not a diagnosis, and does not assess pregnancy, body composition or individual health.

Sources: WHO body mass index

Useful next steps

  1. Use Compare options to test an alternative side by side.
  2. Check the official sources above before relying on the figure.
  3. Copy, print or download a record of this calculation when you need one.

Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.

How the adult bmi calculation works

BMI = weight in kilograms ÷ height in metres squared.

For adults only. BMI is a population screening measure, not a diagnosis, and does not assess pregnancy, body composition or individual health.

Using this calculator

  1. Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
  2. Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
  3. Review bmi and category, then read the stated assumptions and eligibility conditions before using the result.

Official sources and further information

Worked example

This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.

See example inputs
Weight (kg)
75
Height (cm)
175
Age
30
BMI
24.49
Category
Within the standard adult BMI range