Free Online Ideal Weight Calculator, Devine, Robinson, Miller and Hamwi
See a healthy target weight for your height. Enter your height and sex to get the ideal weight by four classic formulas, Devine, Robinson, Miller and Hamwi, and the healthy weight range that a normal BMI gives. The four formulas disagree a little, which is the point: an ideal weight is a range to aim at, not one exact number.
Free Forever Nothing Uploaded Four Formulas As You Type
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Ideal Weight CalculatorA healthy target weight for your height, four ways.
Everything is worked out in your browser. No number you type is sent anywhere, and there is no account.
Your height and sex
Nothing is uploaded; every number stays in your browser.
The formulas use a different base weight for each.
cm
ft
in
Result
The save button in the top bar keeps the numbers you have filled in, on this device only.
Units and numbers
Display
Size
Theme
Full screen hides the page around the tool. Press Escape, or the button in the bar, to come back.
History
Your data
Settings, history and saved setups live in this browser and nowhere else. There is no account and no server, which also means clearing them here is final.
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The classic ideal weight formulas all follow the same shape: a base weight at five feet of height,
plus a fixed amount for every inch above that. Devine came first, in 1974, built for drug dosing
rather than health. Robinson, Miller and Hamwi adjusted the numbers from different data. Because
they started from different places, they land a few kilograms apart for the same person.
That spread is the honest answer. There is no single correct weight for a given height, so
a set of formulas that disagree slightly is more truthful than one that names an exact figure.
Take the range they cover, and the healthy BMI band alongside, as the target to aim inside rather
than a bullseye to hit.
They only know your height and sex. Like BMI, these formulas cannot see muscle, frame size
or body fat, so a muscular person will sit above their ideal weight while being perfectly healthy.
Use the figures as a rough guide, and weigh them against how you look, feel and perform.
Where Your Input Goes
Nowhere. And you can check that yourself.
Your height is worked out in your browser and never sent anywhere.
It is all done by your own browser. Press F12, open the Network tab, and use the tool:
the page fetches its own code and nothing else. Or load the page, turn off your wifi, and
carry on. It still runs, because there was never a server in the middle.
How to Find Your Ideal Weight
A few steps, and nothing is uploaded.
1
Pick metric or imperialOne switch flips the height field and the results between systems.
2
Choose your sexThe formulas use a different base weight for men and women.
3
Enter your heightIn centimetres, or feet and inches. Nothing is uploaded.
4
Read the rangeThe ideal weight by four formulas, plus the healthy BMI range.
What to Know About Ideal Weight
Including the things this tool cannot do.
An ideal weight is a range, not one number. The four formulas were built from different data and disagree by a few kilograms for the same height. That spread is honest: no equation can name a single perfect weight. Aim inside the band they cover rather than at one exact figure.
They know only your height and sex. Like BMI, these formulas cannot see muscle, frame size or body fat. A muscular person will read above their ideal weight while being healthy, and a small-framed person may sit below it. Read the numbers as a guide, not a rule.
The healthy BMI range is the most forgiving. It is simply the weights that give a normal BMI for your height, and it is usually wider than the four formulas. If the formulas feel strict, the BMI band is the gentler and more modern way to describe a healthy weight.
Devine was not designed for health at all. It was created in 1974 to help calculate drug doses, and it and its cousins have carried into fitness by habit. They are useful rough guides, but they were never meant to be a verdict on the right weight for a body.
Key Features & Capabilities
What this tool does, and what it deliberately does not.
Four formulasDevine, Robinson, Miller and Hamwi side by side.
Healthy BMI rangeThe weights that give a normal BMI for your height.
Metric or imperialHeight and results in centimetres or feet and pounds.
As you typeThe figures update while you edit, with no run button.
History and savedRecent results and named setups, on this device only.
Nothing uploadedYour height stays in the browser.
About the Ideal Weight Calculator
An ideal weight calculator answers a simple question, what should I weigh for my height, with the honest reply that there is no single number. This tool gives four classic formulas, Devine, Robinson, Miller and Hamwi, and the healthy weight range that a normal BMI produces, so you can see the band they cover rather than one figure pretending to precision.
The formulas share a structure, a base weight at five feet plus a set amount per inch above, but each uses different constants, so they land a few kilograms apart. That disagreement is useful information: it shows that ideal weight is a range to aim inside, not a target to hit. All the results are shown in whichever units you have chosen, and the switch is a single click.
None of these formulas can see muscle, frame or body fat, so a strong, lean person will read above their ideal weight while being perfectly healthy. Treat the numbers as a rough guide alongside how you look, feel and perform. Everything is worked out in your browser, with nothing uploaded and no account, and it is general information rather than medical advice.
Frequently Asked Questions
Why the formulas disagree, and how to read the range.
Because they were built from different data with different constants. They agree on the shape, a base weight plus an amount per inch of height, but not on the exact numbers. The spread of a few kilograms is a fair reflection that ideal weight is a range, not a single value.
None over the others exactly; they are all rough guides. Many people take the average, or use the healthy BMI range instead, which is wider and more modern. The point is to find a sensible band to aim inside rather than one precise number.
No. Like BMI, these formulas know only your height and sex. A muscular or large-framed person will sit above their calculated ideal weight while being healthy. Use the figures with judgement, not as a strict target.
Not on its own. These are approximations, and being a little above them, especially with good muscle, is common and often fine. Look at the healthy BMI range, your body fat and your fitness together rather than at one formula.
No. Your height and frame go into the formulas in this tab. Nothing leaves the page, saved setups stay in this browser, and it works offline.
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