Last updated October 13, 2026 · Report an error
Adjusted body weight (ABW) is a standard clinical reference calculation built on the Devine ideal body weight (IBW) formula: ABW = IBW + 0.4 x (actual weight - IBW). It is commonly used as a dosing-weight estimate for people whose actual weight is well above their ideal weight. This calculator is for general reference and educational purposes only — it is not a medical diagnosis or a specific drug dose. Always confirm any clinical dosing weight with a qualified healthcare professional.
How it works
Enter your height, sex, and actual weight. The tool first computes ideal body weight using the Devine formula, then applies the 0.4 adjustment factor to your actual weight to produce the adjusted body weight.
- Enter sex.
- Enter height (cm).
- Enter actual weight (kg).
- Click Calculate to see your results.
Examples
A 110kg adult at 175cm (male)
Ideal body weight is about 70.5kg. Adjusted body weight = 70.5 + 0.4 x (110 - 70.5) = about 86.3kg.
Who should use it
- Reference calculation for clinical dosing-weight discussions.
- Understanding the gap between ideal and actual body weight.
Industry applications
- Clinical nutrition and pharmacy reference
- Healthcare education
Advantages
- Simple, standard, and widely published formula.
- Builds directly on the well-established Devine ideal body weight formula.
Limitations
- Not a substitute for individualized clinical judgment.
- Devine formula itself is a simplification not validated for all body types.
Common mistakes to avoid
- Using adjusted body weight as a personal weight-loss target rather than understanding it as a clinical reference calculation.
- Applying the formula without confirming it with a healthcare professional for any actual clinical use.
Best practices
- Treat the result as a reference figure to discuss with a healthcare professional, not a self-directed clinical decision.
Tips
- Always pair this reference number with guidance from a qualified healthcare professional before using it for any clinical purpose.