Estimate a healthy weight for your height. This free ideal weight calculator compares the standard Devine, Robinson and Miller formulas with the healthy BMI range – reference estimates, not personal targets.
“Ideal weight” formulas are rough population estimates and don’t account for build, muscle or age. A healthy weight is personal – ask a healthcare professional.
How Ideal Weight Calculator Works
This tool estimates a reference “ideal weight” for your height using three classic medical formulas side by side, plus the healthy BMI weight range for comparison. Each formula was built from different population data, so they rarely agree exactly — that spread is useful context on its own.
Formula: Let “over” = height in inches minus 60, with a minimum of 0. Devine (kg) = 50 + 2.3 × over for men, or 45.5 + 2.3 × over for women. Robinson (kg) = 52 + 1.9 × over for men, or 49 + 1.7 × over for women. Miller (kg) = 56.2 + 1.41 × over for men, or 53.1 + 1.36 × over for women. The headline result shown is the average of all three: (Devine + Robinson + Miller) ÷ 3.
- Sex — male or female, since each formula uses different constants for each
- Height — your height in centimeters, or feet and inches in imperial mode, used to find inches over 5 feet
Example Scenarios
| Sex | Height | Devine (kg) | Robinson (kg) | Miller (kg) | Average estimate |
|---|---|---|---|---|---|
| Male | 5’0″ | 50.0 | 52.0 | 56.2 | 52.7 kg |
| Male | 5’6″ | 63.8 | 63.4 | 64.7 | 64.0 kg |
| Male | 6’0″ | 77.6 | 74.8 | 73.1 | 75.2 kg |
| Female | 5’0″ | 45.5 | 49.0 | 53.1 | 49.2 kg |
| Female | 5’4″ | 54.7 | 55.8 | 58.5 | 56.3 kg |
| Female | 5’8″ | 63.9 | 62.6 | 64.0 | 63.5 kg |
Ideal Weight Calculator FAQ
Why does this calculator show three different formulas instead of one number?
Devine, Robinson, and Miller were each derived from different population studies decades apart, so they don’t produce identical numbers. Showing all three (plus their average) gives you a realistic range rather than a false sense of precision from a single formula.What does the “over 5 feet” adjustment in these formulas mean?
All three formulas start from a base weight at exactly 5 feet (60 inches) tall, then add a fixed amount per inch above that. If your height is 60 inches or less, that adjustment is zero and you get the base weight for your sex.Is Devine, Robinson, or Miller the most accurate formula?
None is universally “correct” — they were built for different purposes, including drug-dosing calculations in Devine’s case. Most people treat the average of the three as a reasonable midpoint reference rather than picking one as definitive.Why are separate formulas used for men and women?
The original studies behind these equations found men and women have different average weight-to-height relationships, largely reflecting typical differences in muscle and bone mass, so each formula uses sex-specific base weights and per-inch constants.How does the healthy BMI range weight compare to these ideal weight formulas?
The BMI-based range (weight at BMI 18.5 to 24.9) is usually wider than the Devine/Robinson/Miller estimates, which tend to cluster near the middle of that range. Comparing both gives you a broader picture than either alone.Do these formulas account for body frame size or muscle mass?
No. All three formulas use only height and sex, so they don’t adjust for a naturally small or large frame, muscle mass, or body composition. Someone with a larger frame may reasonably weigh more than these estimates suggest.Related Calculators
Cross-check your result with the BMI calculator for the standard healthy-weight range, or the body frame size calculator to see whether your frame is smaller or larger than average before comparing these formulas. The lean body mass calculator is another useful reference if you want an estimate that accounts for body composition.