Ideal Body Weight Calculator
Calculate clinical ideal body weight targets for men and women using the established Devine, Robinson, and Miller equations.
About Clinical Ideal Body Weight (IBW)
Ideal Body Weight equations were originally derived in clinical pharmacology to compute precise intravenous drug clearance dosages and ventilator tidal volumes.
The Devine Formula (Established Standard)
- Men: 50 kg + 2.3 kg per inch over 5 feet
- Women: 45.5 kg + 2.3 kg per inch over 5 feet
Frequently Asked Questions
Is IBW a strict aesthetic guideline?
No. IBW equations are clinical tools and do not differentiate between dense muscle mass and adipose tissue.
Why is IBW essential in medicine?
Hydrophilic medications distribute mainly into lean tissues; calculating dosage from total actual weight in obese patients risks severe toxicity.
What if my height is below 5 feet (152.4 cm)?
The standard baseline value (50 kg for males, 45.5 kg for females) serves as the standard clinical baseline.
How does Devine compare to the Robinson formula?
The Robinson formula makes slight empirical adjustments (yielding slightly lower target weights for men and slightly higher for women).
Calculate in three steps
- 1Enter your valuesUse the fields above and check the units shown beside each input.
- 2Run the calculationSelect Calculate to refresh the result with your latest values.
- 3Review or shareCompare the result, reset the form, print it, or share this page.