Ideal Weight Calculator
Calculate your ideal body weight range using four leading medical formulas — Devine, Robinson, Miller, and Hamwi.
Did this tool work for you?
How to use this calculator
Each formula adds a fixed number of kilograms per inch above 5 feet to a base weight. The tool reports all four results, their average and the lowest-to-highest span.
- 1
Type your height in centimetres.
- 2
Pick the sex setting, because each formula has a separate base weight for it.
- 3
Read the four formula results, their average and the lowest-to-highest span.
- 4
If the height is under 152.4 cm, note that every formula returns its base weight.
Frequently asked questions
Is there one ideal weight for my height?
Not from this tool. It prints four separate numbers, and at 175 cm for the male setting they run from 68.7 kg to 72.0 kg. The tool uses only height and the sex setting, so it knows nothing about build, age or health, and the span is a reference point rather than a target.
Which formulas and constants are built in?
Each formula is base weight plus a fixed amount per inch above 60 inches. Devine: male 50 kg + 2.3, female 45.5 kg + 2.3. Robinson: male 52 kg + 1.9, female 49 kg + 1.7. Miller: male 56.2 kg + 1.41, female 53.1 kg + 1.36. Hamwi: male 48 kg + 2.7, female 45.4 kg + 2.27. Those are all the constants the tool carries.
How is the height converted?
Centimetres are divided by 2.54 to give inches, and 60 is subtracted. 175 cm is 68.9 inches, which is 8.9 inches over the 60-inch mark, so the per-inch amounts are applied to 8.9. The output is kilograms only, shown to one decimal place, and there is no pounds option.
What happens below 5 feet (152.4 cm)?
The inches over 60 are floored at zero, so nothing is subtracted for short heights. At 150 cm and the female setting the tool returns 45.5, 49.0, 53.1 and 45.4 kg, which are simply the four base weights, and it adds a note row saying so.
What if the height box is empty or zero?
An emptied box is read as 0, and the tool then shows the prompt “Enter a height above 0” in place of any weights. Before that check was added, a zero height returned the base weights as if it were a real answer. Negative heights get the same prompt.
Why do the male and female settings differ?
Every formula carries two sets of constants, one per setting, and the tool selects one set from the dropdown. The male constants give a higher base weight in all four formulas and a higher per-inch rate in three of them; Devine uses 2.3 kg per inch for both settings. Only two settings exist, so the tool cannot reflect anything beyond them.
Is this medical advice?
No. It reports arithmetic from published equations and does not say what any weight means for health or what anyone should weigh. A doctor or registered dietitian who knows your history governs any decision about weight.
Ideal weight calculator — Devine, Robinson, Miller and Hamwi formulas
What the calculation does
The tool turns your height into inches, subtracts 60 for the first five feet, and floors the remainder at zero. Four straight-line formulas then add a set number of kilograms per extra inch to a base weight picked by the sex setting. The output lists each formula, the plain average of the four, and the lowest-to-highest span. Nothing else enters the sum: age, frame size and muscle are not asked. Because every formula is linear, each extra inch of height adds the same fixed amount, such as 2.3 kg for Devine on the male setting. The span line is the smallest and largest of the four numbers, the average line is their sum divided by four, and every figure is printed in kilograms to one decimal place.
The constants as coded
These are the figures built into this tool, in kilograms. Each result is the base plus the per-inch amount times the inches over 60.
| Formula | Male | Female |
|---|---|---|
| Devine | 50 + 2.3 per inch | 45.5 + 2.3 per inch |
| Robinson | 52 + 1.9 per inch | 49 + 1.7 per inch |
| Miller | 56.2 + 1.41 per inch | 53.1 + 1.36 per inch |
| Hamwi | 48 + 2.7 per inch | 45.4 + 2.27 per inch |
Four runs of the calculator
Each column below was produced by running the tool with the stated height and setting. The 190 cm column shows the spread widening with height, because the per-inch rates differ between formulas: the four results are 3.3 kg apart at 175 cm male but 10.9 kg apart at 190 cm male.
| Formula | 175 cm male | 165 cm female | 190 cm male | 150 cm female |
|---|---|---|---|---|
| Devine | 70.5 | 56.9 | 84.0 | 45.5 |
| Robinson | 68.9 | 57.4 | 80.1 | 49.0 |
| Miller | 68.7 | 59.8 | 77.1 | 53.1 |
| Hamwi | 72.0 | 56.7 | 88.0 | 45.4 |
| Span | 68.7 – 72.0 | 56.7 – 59.8 | 77.1 – 88.0 | 45.4 – 53.1 |
| Average | 70.0 | 57.7 | 82.3 | 48.3 |
Edge cases worth knowing
Below 152.4 cm the inches over 60 count as zero, so the answer stops changing with height and equals the four base weights; the 150 cm column shows this. A height of 0 or an emptied box produces a prompt instead of numbers. Heights are read in centimetres only and answers appear in kilograms to one decimal. The average is the unweighted mean of the four results, so one outlying formula pulls it. For tall heights on the male setting Hamwi rises fastest and Miller slowest. The sex setting changes only which constants are used; it is not checked against anything else.
Scope and medical note
The tool performs arithmetic on four published equations and attaches no meaning to the output. It does not say whether any weight is healthy, low or high, and it does not set goals. It is not medical advice. A clinician who knows your history decides what a suitable weight is for you, and a result here should never override that guidance. Muscle mass, bone structure, age, pregnancy and medical conditions are all outside what these equations can represent, so two people of the same height and sex setting receive identical output.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →