Ideal Weight Calculator Online
Estimate your ideal body weight from height and sex using four standard formulas, right in your browser. A general estimate, not medical advice.
The Ideal Weight Calculator runs entirely in your browser. The height and sex you enter never leave your device and nothing is uploaded to ArrayKit. Results are a general estimate from standard formulas, not medical advice.
Open the Healthy Weight Calculator
About Ideal Weight Calculator
Ideal Weight Calculator estimates a reference body weight for your height and sex using four widely cited formulas — Devine, Robinson, Miller and Hamwi — each of which starts from a base weight at 5 feet and adds a fixed amount per inch of height above that. Switch between Metric (centimetres) and US (feet and inches) units, choose male or female, and the tool shows all four estimates side by side plus their average. It is a quick way to see a reference range before setting a fitness goal, comparing against a BMI-based healthy range, or discussing weight targets with a coach. Everything computes instantly on your device — your height and sex are never uploaded. This is a general estimate from standard formulas and does not replace medical advice from a healthcare professional.
Features
- Computes ideal body weight with the Devine, Robinson, Miller and Hamwi formulas
- Shows all four formula results side by side plus their average
- Toggle between Metric (cm) and US (ft/in) height units
- Male and female presets built into each formula
- Instant results as you type, with no page reloads
- Copy a plain-text summary of every formula result in one click
- Clear error message for missing or unrealistic height
- Runs entirely in your browser — your figures never leave your device
How to use the Ideal Weight Calculator
- Choose male or female
- Choose Metric or US height units
- Enter your height
- Read the four formula estimates and their average, or copy the summary
Example
Input
male, 180 cm
Output
Ideal weight: ~73 kg (avg)
The average of the Devine, Robinson, Miller and Hamwi estimates for a 180cm male.
Common errors & troubleshooting
- Ideal Weight Calculator shows an error even though a height was entered. — Make sure the height is greater than zero — in US mode, fill in at least the feet or inches field.
- Result looks way too high or too low after switching units. — Switching between Metric and US keeps each unit's fields separate, so re-enter your height in the newly selected unit system.
- The four formulas give noticeably different numbers. — Each formula uses a different base weight and per-inch slope, so a spread of a few kilograms between them is normal — the average smooths that out.
- Height under 5 feet produces a low or unexpected estimate. — Every formula is anchored to 5 feet (60 inches); shorter heights subtract from the base weight, which can push results low for very short heights.
Frequently asked questions
- What formulas does the Ideal Weight Calculator use?
- It uses four standard reference formulas — Devine (1974), Robinson (1983), Miller (1983) and Hamwi (1964) — each starting from a base weight at 5 feet and adding a fixed amount per inch of height above that, separately for men and women.
- Why do the Devine, Robinson, Miller and Hamwi results differ?
- Each formula was derived from a different reference population and uses its own base weight and per-inch slope, so results typically vary by a few kilograms. The Ideal Weight Calculator also shows the average of all four.
- Does the Ideal Weight Calculator work in pounds and feet/inches?
- Yes. Switch the unit toggle to US and enter your height in feet and inches — the calculator converts to centimetres internally before applying each formula.
- Is the Ideal Weight Calculator's result medical advice?
- No. It gives a general estimate based on standard formulas. It is not a diagnosis and does not replace guidance from a doctor or other qualified healthcare professional.
- How is the Ideal Weight Calculator different from the BMI Calculator?
- BMI relates weight and height into a single index and a healthy range, while the Ideal Weight Calculator estimates a specific reference weight in kilograms or pounds using formulas built for that purpose. Use both together for a fuller picture.
- Is my height and sex data uploaded when I use the Ideal Weight Calculator?
- No. The Ideal Weight Calculator runs entirely in your browser. The values you enter are used only to compute the result on your device and are never sent to ArrayKit or anywhere else.
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