PUBLIC LIBRARY / CALCULATOR

BMI (Body Mass Index)

Relates weight and height to classify nutritional status in adults (≥18 years) according to WHO.

Calculate with transparency

Check the population, units and version. The result shows the formula or classification; it does not make an automatic treatment decision.

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Method · Limits of application

WHO/TRS 894/2000: kg/m², adults; Asian action points 23/27.5, WHO 2004

BMI relates weight and height but does not directly measure body fat or distinguish fat, muscle and bone. Pediatric interpretation depends on age, sex and reference curves; applying the adult classification to a value calculated in a child does not demonstrate its applicability. CDC distinguishes children and adolescents aged 2–19 years from adults aged 20 years and older; that boundary belongs to CDC guidance and does not automatically replace the classification edition presented here. The result must be interpreted with other clinical data.

Conditions of use

Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.

Documented parameters

Weight · kg
Height · cm
Population

4/4 reference cases checked. Numerical tests are not clinical validation.

Sources and documentation

Documented formula

Transcribed from the source or a recorded revision; this is not a clinical recommendation.

BMI = weight (kg) ÷ height² (m²).

For Asian populations, WHO (2004) added public-health action points: 23 kg/m² (increased risk) and 27.5 kg/m² (high risk).

References

Identifier: imc

Original clinical content: Brazilian Portuguese.

Method version

WHO/TRS 894/2000: kg/m², adults; Asian action points 23/27.5, WHO 2004

imc@native-2026-10-03+3c8f333d73f2

World Health Organization. Obesity: preventing and managing the global epidemic. Report of a WHO consultation. WHO Technical Report Series 894, 2000.

The bibliographic edition identifies the source. By itself, it proves neither full conformity of the formula nor clinical approval.

Synthetic cases checked (4)

Synthetic cases for checking the implementation, with no patient data.

Case 1

reference-001

Inputs

Weight: 70 kg
Height: 175 cm
Population: General

{
  "peso": 70,
  "altura": 175,
  "pop": "g"
}

Expected result

{
  "imc": 22.857
}

Actual result

{
  "imc": 22.857142857142858
}

Case 2

reference-002

Inputs

Weight: 100 kg
Height: 200 cm
Population: General

{
  "peso": 100,
  "altura": 200,
  "pop": "g"
}

Expected result

{
  "imc": 25
}

Actual result

{
  "imc": 25
}

Case 3

reference-003

Inputs

Weight: 95 kg
Height: 170 cm
Population: General

{
  "peso": 95,
  "altura": 170,
  "pop": "g"
}

Expected result

{
  "imc": 32.872
}

Actual result

{
  "imc": 32.871972318339104
}

Case 4

reference-004

Inputs

Weight: 70 kg
Height: 170 cm
Population: Asian

{
  "peso": 70,
  "altura": 170,
  "pop": "a"
}

Expected result

{
  "imc": 24.221
}

Actual result

{
  "imc": 24.221453287197235
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

The code tests are technical checks. Clinical approval and professional translation review are recorded separately.

Relationship with cancer research

Support for research — context required

An anthropometric measure for population characterization. A relationship with cancer depends on the study question and data, without automatic causal inference.

Applications: Epidemiology