Calculator
What the Ideal Weight Calculator does
Ideal Weight Calculator: calculates Ideal Weight (average of 4 formulas), Healthy Range Low and Healthy Range High from Units, Height and Height (feet). Example: units Metric (cm, kg), height 170 cm and height (feet) 5 ft gives ideal weight (average of 4 formulas) 65.9 kg.
This calculator reads Units, Height, Height (feet) and Height (inches) and produces Ideal Weight (average of 4 formulas), Healthy Range Low and Healthy Range High. Everything recomputes live, which makes it easy to test a few scenarios in a row.
Population formulas give you a starting point, not a verdict about your body. The Ideal Weight Calculator exists to take that particular chore off your hands.
The work is done by JavaScript already loaded in your browser, so your input never crosses the network.
Each field is explained further down, along with the method and a worked example that uses the default values.
What do the Ideal Weight Calculator fields mean?
The Ideal Weight Calculator uses 5 inputs. The fields arrive populated, which makes it easy to nudge a single figure and watch what moves.
| Field | What to enter | Default |
|---|---|---|
| Units | choose from Metric (cm, kg) or Imperial (ft/in, lb) | Metric (cm, kg) |
| Height | measured in cm; accepts 120 to 230 | 170 |
| Height (feet) | measured in ft; accepts 3 to 8 | 5 |
| Height (inches) | measured in in; accepts 0 to 11.9 | 7 |
| Sex | choose from Male or Female | Male |
How does the Ideal Weight Calculator work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
Bad input produces a message, not a silently incorrect figure.
Worked example
These are the values the Ideal Weight Calculator loads by default, and the result it produces from them. The numbers below come straight from the default inputs, so you can verify them against the live tool.
| Units | Metric (cm, kg) |
|---|---|
| Height | 170 cm |
| Height (feet) | 5 ft |
| Height (inches) | 7 in |
| Sex | Male |
| Ideal Weight (average of 4 formulas) | 65.9 kg |
|---|---|
| Healthy Range Low | 59.4 kg |
| Healthy Range High | 72.5 kg |
| Healthy BMI Weight Range (18.5 to 24.9) | 53.5 kg to 72.0 kg |
| By Formula | Devine 65.9 kg · Robinson 65.2 kg · Miller 66.0 kg · Hamwi 66.7 kg |
| What this means | A healthy weight band around your height is roughly 65.9 kg (±10%). The BMI range is broader because it ignores sex… |
Read next: Understanding BMI: What the Number Measures, and What It Misses
How to use it
- Pick a value for Units: the options are Metric (cm, kg) or Imperial (ft/in, lb).
- Put Height in cm (120 to 230).
- Key in Height (feet) in ft (3 to 8).
- Fill in Height (inches) in in (0 to 11.9).
- Pick a value for Sex: the options are Male or Female.
- Skip the submit button; there is not one. Editing is enough.
- Check Ideal Weight (average of 4 formulas), Healthy Range Low, Healthy Range High, Healthy BMI Weight Range (18.5 to 24.9), By Formula and What this means on the right.
- To keep the result, either copy the link or print the page. Both preserve what is on screen.
What this tool does not do
- These formulas come from population averages and cannot account for your medical history.
- This is a screening estimate, not a diagnosis.
- It handles the common case well and the unusual case literally.
- The result inherits any error in the inputs without flagging it.
Frequently asked questions
Enter Height in cm, Height (feet) in ft and Height (inches) in in. Every input names its unit, and every output does too, which removes the usual source of error.
Height accepts 120 to 230 cm. Go outside it and you get an error against that specific field instead of a misleading number.
With the values loaded when the page opens, ideal weight (average of 4 formulas) comes out as 65.9 kg. Try changing one value. The answer refreshes without a page reload.
No. There is no upload step, no database, and nothing to delete afterwards.
It is free with no conditions: no sign-up, and no limit on how often you use it.
Accurate to the published method. Whether the published method suits your circumstances is a question for someone who knows your history.