Adjusted Body Weight Calculator
Calculate Adjusted Body Weight (ABW) and Ideal Body Weight (IBW) using Devine, Robinson, Miller, and Hamwi formulas
Your Details
Quick examples
Reference estimate only — not medical advice. Dosing and clinical decisions must be made by a qualified healthcare professional.
Calculation Results
Interpretation
IBW & ABW by Formula
| Formula | IBW | ABW |
|---|
How we calculated this
IBW & ABW by Formula
What if?
Each row recalculates with your current inputs. Tap a row to apply it.
Compare two plans
Enter height and weight to calculate ABW
Fill in gender, height and actual weight above
Adjusted Body Weight Calculator FAQ
What is adjusted body weight used for?
ABW estimates a dosing or nutritional weight when actual body weight is well above ideal weight. It assumes only about 20% of the excess weight is metabolically active lean tissue — hence the 0.4 factor. It is commonly referenced for certain medication doses and nutrition assessments.
Why do the four IBW formulas differ?
Devine, Robinson, Miller and Hamwi were derived from different population data and purposes, so each gives a slightly different ideal weight. Devine is the most widely cited in clinical pharmacology. The comparison table shows all four side by side.
Which weight should be used — actual, ideal, or adjusted?
As a general convention: actual weight when below or near IBW, adjusted weight when well above IBW. The interpretation card shows where you fall. This is a reference convention only — the choice for a specific medication or nutrition plan belongs to your clinician.
Related Weight & Health Calculators
BMI Calculator
Calculate your Body Mass Index (BMI) and get personalized health insights with our professional BMI calculator
BMR/TDEE Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) with activity-based calorie targets
Water Intake Calculator
Estimate your daily water intake based on body weight, activity level, and climate conditions