PUBLIC LIBRARY / CALCULATOR

Ideal and adjusted body weight

Estimates ideal weight from height and sex (Devine), and adjusted weight in obesity, used for dosing and nutritional requirements.

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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

Devine 1974/Robinson 1983/Miller 1983; Pai–Paloucek review 2000; adjusted weight local factor 0.4

Ideal weight is an estimate from height/weight tables, not a measurement of lean mass. The pharmacokinetic relationship varies by drug; this abstract does not confirm a universal adjusted factor of 0.4. Choice of weight for dosing must follow the drug source and corresponding population.

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

Sex
Height · cm
Actual body weight (for adjusted weight) · kg

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.

Ideal weight (Devine): men 50 kg + 2.3 kg per inch above 5 feet; women 45.5 kg + 2.3 kg per inch above 5 feet. In centimeters: 50 (45.5) + 2.3 × (height − 152.4) ÷ 2.54.

Adjusted weight = Ideal weight + 0.4 × (actual weight − Ideal weight).

References

Pai MP, Paloucek FP. The origin of the "ideal" body weight equations. Ann Pharmacother, 2000.

Identifier: peso-ideal-e-ajustado

Original clinical content: Brazilian Portuguese.

Method version

Devine 1974/Robinson 1983/Miller 1983; Pai–Paloucek review 2000; adjusted weight local factor 0.4

peso-ideal-e-ajustado@native-2026-10-03+2460d05a7311

Source for the active edition

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

Sex: Male
Height: 180 cm

{
  "sexo": "M",
  "altura": 180
}

Expected result

{
  "ibw": 74.99
}

Actual result

{
  "ibw": 74.99212598425196
}

Case 2

reference-002

Inputs

Sex: Male
Height: 180 cm
Actual body weight (for adjusted weight): 120 kg

{
  "sexo": "M",
  "altura": 180,
  "peso": 120
}

Expected result

{
  "ibw": 74.99,
  "abw": 93,
  "pct": 160
}

Actual result

{
  "ibw": 74.99212598425196,
  "abw": 92.99527559055117,
  "pct": 160.01679966400675
}

Case 3

reference-003

Inputs

Sex: Female
Height: 165 cm

{
  "sexo": "F",
  "altura": 165
}

Expected result

{
  "ibw": 56.91
}

Actual result

{
  "ibw": 56.90944881889763
}

Case 4

reference-004

Inputs

Sex: Male
Height: 152.4 cm

{
  "sexo": "M",
  "altura": 152.4
}

Expected result

{
  "ibw": 50
}

Actual result

{
  "ibw": 50
}

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

General context — relationship to be defined

A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.