Ideal Weight Calculator
Calculate ideal weight range
About the Ideal Weight Calculator
There is no single "ideal weight", which is exactly why this calculator shows four. It runs your height and sex through the Devine, Robinson, Miller, and Hamwi formulas — the classic clinical estimates — and reports each result alongside their average, so you get a sensible range rather than one arbitrary figure.
These formulas were developed for medical contexts like dosing and are widely used as healthy-weight references. Seeing all four together is the value here: they disagree slightly, and the spread between them is a more honest picture than any one number. Anyone setting a weight goal can use the range as a grounded target rather than chasing a single point.
How to Use the Ideal Weight Calculator
- Select your sex.
- Enter your height in centimeters.
- Read the estimated average ideal weight.
- Compare the individual Devine, Robinson, Miller, and Hamwi results to see the range they suggest.
Why Use ToolForge’s Ideal Weight Calculator
- It computes four established formulas at once and averages them, giving a defensible range instead of a single, falsely precise number.
- Showing each named formula's result lets you see how much the methods differ for your height.
- It needs only height and sex, the inputs these formulas actually use, so it is quick and unambiguous.
- Everything is calculated locally, so your figures never leave your device.
Frequently Asked Questions
Why are there four different ideal weight formulas?
The Devine, Robinson, Miller, and Hamwi formulas were developed at different times for clinical use and each weights height slightly differently. None is definitively "correct," so this calculator shows all four and their average to give you a realistic range.
Is ideal weight the same as a healthy weight?
Not exactly. These formulas estimate a reference weight based only on height and sex; they do not account for muscle mass, frame size, or body composition. Treat the result as a guideline alongside measures like BMI and body fat percentage.
Why doesn't it ask for my current weight?
The formulas estimate a target weight from height and sex alone — your current weight is not an input. Compare the result to your actual weight yourself to see how far above or below the estimated range you are.
Do frame size and muscle affect the result?
The formulas ignore both, using only height and sex. A muscular or large-framed person may sit healthily above the estimate, while a small-framed person may sit below it — another reason to read the four-formula range alongside body composition rather than treating one number as a goal.
