About this calculator
The Devine ideal body weight formula is commonly used as a clinical dosing reference. It should not be interpreted as a personal goal weight or wellness target.
Uses the Devine ideal body weight equations: male = 50 kg + 2.3 kg per inch over 5 ft; female = 45.5 kg + 2.3 kg per inch over 5 ft. IBW is a dosing reference, not a wellness target.
Source-mapped educational formula
Educational estimate only; not a diagnosis, prescription, or treatment plan.
Formula and method
Male IBW = 50 kg + 2.3 kg × inches over 60. Female IBW = 45.5 kg + 2.3 kg × inches over 60. For heights below 5 ft, the same linear form is shown as an estimate with caution.
Limitations and when not to rely on this result
- Educational estimate only; not a diagnosis, prescription, or treatment plan.
- Result depends on accurate inputs and may not apply to complex medical situations.
- Use clinician judgment, local guidance, and urgent care pathways when symptoms are severe.
Frequently asked questions
Is ideal body weight my healthy weight? +
No. IBW formulas are rough clinical references and are often used for medication dosing, not body image or wellness goals.
Why does the formula use sex? +
The Devine equations use different constants for male and female adults.
Can this be used for children? +
No. Pediatric dosing and growth assessment require pediatric methods.
Can pregnancy affect IBW use? +
Yes. Pregnancy and fluid shifts need individualized clinical interpretation.
What if actual weight is much higher than IBW? +
Some dosing uses adjusted body weight instead of IBW or actual weight, depending on the medication.