The Devine equation is a reference estimate: Formula, Uses, and Limits

The Devine formula is one of several equations that estimate an “ideal” body weight from height. The name can make the result sound like a personal health target, but it is better understood as a historical reference estimate. It does not account for an individual’s medical history, body composition, goals, or circumstances.

How the Devine formula is usually written

Common calculator implementations express the equation in pounds for height in inches above 5 feet:

Men: 110 lb + 5 lb for each inch above 5 feet.
Women: 100 lb + 5 lb for each inch above 5 feet.

Some versions use metric equivalents or handle heights below 5 feet differently. That means two calculators can show different answers if they use different conventions. Check which equation and units a tool uses before comparing results. This estimate is not a measured weight and should not be treated as a prescription.

Devine formula explainer: height is entered into a historical equation to produce a reference estimate, not a personal weight goal. — Original formula explainer. The output is a reference estimate, not an individualized recommendation.

What the number cannot tell you

A height-only equation cannot assess body fat, nutrition status, strength, or health. The CDC explains that even BMI is a screening measure that does not distinguish fat, muscle, and bone; an ideal-weight equation is also limited and should not be used to diagnose a condition or determine treatment on its own.

Healthcare professionals may encounter ideal body weight equations in specific clinical contexts. That is different from using the output as a goal for everyday weight management or as a medicine dose. Do not start a diet, stop a treatment, or change a prescribed dose based on this calculator.

If you are considering a weight goal, ask a healthcare professional to help put measurements in context. Our calculator collection offers general educational tools, not personalized medical advice.

Silent visual explainer. Transcript: the Devine equation converts height into a historical reference estimate; it does not define an individual’s ideal weight.

Common questions

Is the Devine result a healthy target?

Not by itself. A formula cannot choose an appropriate personal goal.

Why do calculators disagree?

They may use different equations, unit conversions, rounding, or rules for heights below 5 feet.

Can I use the result to adjust medication?

No. Medication decisions belong with the clinician who knows the specific treatment and patient.

Sources

Educational information only; the formula is not a personal weight prescription.

Devine Formula Ideal Weight