Actual body weightNormalized input
— kgThe measured or entered body weight; not automatically selected for dosing.
Body size · Adult
Body Size & Dosing Weight
See actual weight, Devine ideal body weight, adjusted body weight 0.4, and BMI together—without labeling one value as the automatic dosing choice.
Evidence recordSources and method currentVersion 0.1 · Updated July 17, 2026
Step 1
Enter body measurements
Private by design. Values are calculated on this device and are not saved or sent to analytics.
Step 2
Compare body-size values
Ideal body weightDevine historical equation
— kgShown only at heights of at least 5 ft.
Adjusted body weight0.4 correction factor
— kgShown only when actual weight exceeds calculated IBW.
BMI— kg/m²
Displayed as a descriptive body-size measure, not a dosing instruction.
No automatic dosing weight.The correct weight scalar is medication- and context-specific. Verify the current prescribing information and institutional policy.
Evidence packet
What this tool is based on
This versioned record keeps the citations, equation or decision rule, units, test coverage, intended population, and exclusions attached to the tool.
How evidence review works →Original Devine equation · Primary publicationDevine BJ. Gentamicin therapy.Drug Intell Clin Pharm. 1974;8(11):650–655. DOI: 10.1177/106002807400801104 ↗Historical review · Evidence reviewPai MP, Paloucek FP. The origin of the ‘ideal’ body weight equations.Ann Pharmacother. 2000;34(9):1066–1069. PMID: 10981254 ↗Adjusted-weight evaluation · Validation studyWinter et al. Impact of various body weights and serum creatinine concentrations on Cockcroft–Gault.Pharmacotherapy. 2012;32(7):604–612. PMID: 22576791 ↗
Intended population
Adults at least 5 ft (152.4 cm) tall when a medication-specific source requires one of these body-size estimates.
Equation record
Devine ideal body weight, adjusted body weight using a 0.4 correction factor, and BMI displayed separately.
Unit handling
Weight accepts kg or lb; height accepts cm or in. Calculations normalize to kg and cm.
Test coverage
Devine reference cases, adjusted-weight behavior, BMI, unit equivalence, height boundary, and invalid inputs.
Do not skip
Limitations and exclusions
- Devine IBW is not calculated below 5 ft because this implementation does not extrapolate the historical equation.
- Adjusted body weight is shown only when actual weight exceeds calculated IBW.
- These estimates are not interchangeable with lean body weight, predicted body weight, or an automatically correct dosing weight.
- Medication labeling, pharmacokinetic evidence, and institutional policy must determine which weight to use.
- The sex terms reproduce the historical equation and do not represent gender identity.
One clearly labeled, contextually relevant sponsor may support this reference area. Sponsorship will never interrupt inputs, obscure results, influence formulas, or imply clinical endorsement.
About this tool
Ideal and Adjusted Body Weight Calculator
Use this dosing-weight calculator to view actual body weight, Devine ideal body weight, adjusted body weight with a 0.4 factor, BMI, and percent above IBW.
The tool exposes every weight value without automatically choosing one. Medication-specific evidence, patient factors, and local protocol should determine the weight used for dosing.