Ideal Weight Calculator

The Ideal Weight Calculator is a free online tool that calculate ideal body weight using hamwi, devine, robinson, and miller formulas plus a healthy bmi range. supports metric/imperial, frame size, and current-weight comparison.. It runs entirely in your browser with no installation or sign-up needed.

There is no single best formula — all four (Hamwi, Devine, Robinson, Miller) give slightly different results based on historical population data. The average of all four plus a healthy BMI range is a more robust target than any one.

Small frame uses -10% of the formula result; large frame uses +10%. Frame is assessed via wrist circumference or elbow breadth — taller/heavier-boned people need proportionally more mass.

No. They are based on height, sex, and statistical averages only. Athletes with high muscle mass will usually exceed "ideal" weight while still being very healthy. Use body fat percentage for a more accurate picture.

Yes, the Ideal Weight Calculator is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Ideal Weight Calculator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Ideal Weight Calculator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Ideal Weight Calculator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Every formula in this calculator uses a separate baseline and per-inch increment for each sex, which is why a man and a woman of identical height get different targets. For example, Hamwi starts a male at 48 kg and a female at 45.5 kg for the first five feet of height, then adds a larger amount per inch for men. The reasoning is statistical: across the historical populations these formulas were built from, men on average carry more lean mass and a larger frame for a given height than women. The gap typically widens at taller heights because the per-inch difference compounds. It does not account for individual build or muscle, so it is a population reference, not a personal verdict. Select your sex above and the tool applies the correct baseline for each of the four formulas automatically.

The four formulas each return one specific figure, and the calculator averages them into a single best estimate. The healthy BMI range is different: it is a band of weights, not a point. The tool takes the standard normal BMI window of 18.5 to 24.9 and scales it to your exact height, producing a low and high weight that are both considered healthy. This band often spans several kilograms, which is a useful reality check, because no person needs to hit one precise number to be healthy. A single ideal figure works well as a rough goal, while the range shows the realistic spread you can sit anywhere within. Treat the average as a target and the BMI band as your acceptable margin. Enter your height and the calculator shows both side by side.

Frame size reflects bone structure, and the two common ways to gauge it are wrist circumference and elbow breadth. The simplest is to wrap your thumb and middle finger around the narrowest part of your wrist: if they overlap you likely have a small frame, if they just touch a medium frame, and if they do not meet a large frame. Elbow breadth, the distance across the two bones when your arm is bent, is more precise and is compared against height-and-sex charts. In this calculator a small frame applies a -10% adjustment to the formula results, large applies +10%, and medium leaves them unchanged, because broader-boned people naturally carry more healthy mass. If you are unsure, choose medium for the unadjusted figure, then set your frame above to see how the estimate shifts.

The four formulas this tool uses, Hamwi, Devine, Robinson, and Miller, are based only on height and sex, so the core ideal weight figure does not change with age. You can enter your age, but it is used for context and your current BMI comparison rather than altering the formula targets. In real life body composition does shift over the years, as people tend to lose muscle and gain fat with age even when the scale stays flat, which is why the same weight can mean different things at 25 and 65. Because of that, treat the result as a height-based reference rather than an age-adjusted goal, and pair it with body fat percentage or waist measurement for a fuller picture. Enter your height and sex above to get the formula-based estimate instantly.

These four formulas are useful estimates, not precise measurements. They were each published decades ago as quick clinical shortcuts, two of them originally for drug dosing, and they all rely on statistical averages from historical populations using only height and sex. That means they ignore muscle mass, body fat, age, and ethnicity entirely, so a muscular athlete can land well above the ideal figure while being perfectly healthy, since muscle is denser than fat. The four also disagree with each other by a few kilograms because of their different baselines, which is exactly why this calculator averages all of them and shows a healthy BMI range alongside, giving you a steadier reference than any single method. Use the result as one data point among several, including waist size and how you feel. Enter your details above to compare all four at once.