Ideal Weight Calculator
Understanding Your Ideal Weight Estimate
There is no single body weight that is “perfect” for everyone. An ideal weight calculator provides a reference estimate based mainly on your height and sex, using formulas developed for clinical use.
The calculator above gives you results from four established methods: Devine, Robinson, Miller, and Hamwi . Instead of relying on one formula, you can compare several estimates and see how they relate to a broader healthy weight range.
Think of the result as a useful reference point, not a number you are required to reach.
Why Does the Calculator Show Different Ideal Weights?
Each formula approaches ideal body weight slightly differently.
The Hamwi formula dates to 1964. The Devine formula , introduced in 1974, became widely used in clinical settings, particularly for estimating body weight for medication dosing. Robinson and Miller introduced alternative equations in 1983.
Because these methods use different starting weights and adjustments for height, they naturally produce slightly different answers.
That variation is useful. It shows why ideal weight is better viewed as an estimated range rather than one exact number.
|
Method |
What it provides |
|
Devine |
A widely used clinical ideal body weight estimate |
|
Robinson |
An alternative height-based estimate |
|
Miller |
Another variation of ideal body weight |
|
Hamwi |
A simple height-based weight estimate |
How Body Frame Size Affects Your Result
Two people can be the same height but have different natural builds. This calculator lets you select a small, medium, or large body frame to add more context to the formula estimates.
Frame size does not determine whether a particular weight is healthy, and it cannot measure muscle or body fat. It simply helps illustrate why one fixed ideal weight may not suit every person of the same height.
Ideal Weight Is Not the Same as a Goal Weight
Your calculated ideal weight should not automatically become your target weight.
Muscle mass, body composition, age, health history, and individual build can all affect what weight is appropriate for you. Someone who carries more muscle, for example, may naturally weigh more than a traditional ideal weight formula suggests.
This is also why the calculator shows a healthy BMI weight range alongside the formula estimates. The range provides additional context rather than forcing your result into one exact target.
If you want to look specifically at body composition instead of height-based weight estimates, the Body Fat Calculator may be more relevant.
Quick Questions About Ideal Weight
Which ideal weight formula is most accurate?
There is no single formula that gives the perfect weight for every person. Devine, Robinson, Miller, and Hamwi are estimation methods, and their results can differ. Comparing them provides more context than treating one calculation as an exact answer.
Why is my healthy BMI range wider than my ideal weight estimate?
The two calculations answer different questions. Ideal weight formulas generate specific height-based estimates, while the healthy BMI range covers a broader range of body weights associated with standard adult BMI categories.
Does ideal weight depend on age?
The classic formulas used by this calculator are primarily based on height and sex and do not directly adjust for age. Age-related changes in muscle mass and body composition can still affect how useful an ideal weight estimate is for an individual.
Is ideal body weight the same as healthy body weight?
Not necessarily. Ideal body weight is a calculated estimate. A healthy body weight is more individual and may depend on body composition, health status, lifestyle, and other factors that these formulas do not measure.
How NutritionSolver Calculates Your Result
NutritionSolver compares estimates from the Devine, Robinson, Miller, and Hamwi ideal weight formulas and displays them together so you can see how the methods differ.
The result is intended as a general reference rather than a diagnosis or a prescribed target weight.