Adjusted Body Weight Calculator
Calculate ideal body weight (Devine) and adjusted body weight, used for some drug dosing in people above ideal weight. Example: a 70 in man at 180 lb has an ideal weight of 160.9 lb and an adjusted weight of 168.6 lb.
Show steps
How to use the Adjusted Body Weight Calculator
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Ideal body weight (Devine): men 50 kg + 2.3 kg per inch over 60 in; women 45.5 kg + 2.3 kg per inch over 60 in. Adjusted body weight = IBW + 0.4 x (actual weight – IBW).
Ideal and adjusted weight examples (actual 220 lb)
| Height | Ideal (male) | Adjusted (male) |
|---|---|---|
| 5 ft 4 in | 131 lb | 166 lb |
| 5 ft 6 in | 141 lb | 172 lb |
| 5 ft 8 in | 151 lb | 178 lb |
| 5 ft 10 in | 161 lb | 185 lb |
| 6 ft 0 in | 171 lb | 191 lb |
| 6 ft 2 in | 181 lb | 197 lb |
When adjusted body weight is used
Common uses include dosing aminoglycosides and vancomycin, and Cockcroft-Gault creatinine clearance in patients above 120 to 130% of ideal body weight.
Other ideal weight formulas
Robinson, Miller and Hamwi formulas give slightly different ideal weights; Devine is the most widely used in drug dosing.
Cautions
This calculator gives estimates for education and planning, not medical advice. Check with your doctor before major changes to diet, exercise or medicines, especially if you have a medical condition.
Frequently asked questions
What is adjusted body weight?
Ideal weight plus 40% of the excess weight.
When do I use it?
For some drug doses when actual weight is well above ideal.
What is ideal body weight?
A height-based estimate, here the Devine formula.
Is adjusted weight a healthy goal?
No.
Why 0.4?
Because excess weight is only partly metabolically active.
Does it work below 5 feet?
The Devine formula is meant for 5 feet and above.
Sources
- Pai and Paloucek, Ann Pharmacother 2000: The origin of the ideal body weight equations
- National Kidney Foundation
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