Use this free ideal weight calculator to estimate a healthy weight for your height using four trusted medical formulas (Devine, Robinson, Miller, and Hamwi) plus a healthy BMI range. Enter your sex and height below to see all the numbers side by side in pounds and kilograms.
How the Ideal Weight Calculator Works
This ideal weight calculator uses four established medical formulas plus a healthy BMI range so you can compare estimates side by side. Each formula starts from a baseline weight at 5 feet of height and adds a set amount for every inch above that. The Devine, Robinson, Miller, and Hamwi formulas differ only in those baseline and per-inch values, which is why your results vary a little between them.
The Formulas Explained
The Devine formula is the most widely used in clinical settings, originally created to help dose medication. The Robinson and Miller formulas are refinements from 1983 that tend to return slightly lower and more modern numbers. The Hamwi formula, from 1964, is common in dietetics and returns the highest figures of the four. The healthy BMI range row shows the weight span that corresponds to a body mass index of 18.5 to 24.9 for your height, which many clinicians prefer because it gives a healthy range rather than a single number.
How to Use Your Results
Treat the output as a reference range, not a target to hit exactly. Athletes and people with more muscle mass often sit above their “ideal” formula weight while being perfectly healthy, because muscle is denser than fat. Use the healthy BMI range as your broad guardrail and talk to a doctor or registered dietitian before setting a specific weight goal.
Frequently Asked Questions
What is the most accurate ideal weight formula?
There is no single most accurate formula. The Devine formula is the most widely used clinically, but the healthy BMI range is often more useful because it gives a span of healthy weights for your height rather than one number.
Does this ideal weight calculator account for muscle?
No. Like all height-based formulas, it does not measure body composition, so very muscular people may read as above their ideal weight while being healthy. Pair it with a body-composition measure for a fuller picture.
Is ideal weight the same as a healthy weight?
Not exactly. Ideal weight formulas give a point estimate, while a healthy weight is better thought of as a range. This tool shows both so you can see where you fall.
How is ideal weight different for men and women?
Each formula uses a lower baseline weight for women than for men at the same height, so a woman and man of identical height will get different ideal weight estimates.
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