Ideal Weight Calculator

Estimate a healthy target weight range using several established formulas (Devine, Robinson, Miller, and Hamwi) based on your height and sex.

Ideal Weight Calculation Methods

Multiple formulas exist for estimating ideal body weight, each developed from different population studies. The Devine formula is commonly used in medical dosing calculations. The Robinson and Miller formulas provide alternative estimates based on different datasets. The Hamwi formula is popular in clinical nutrition. Our calculator presents results from multiple methods so you can see the range of estimates and understand that ideal weight is a range rather than a single number.

Factors Beyond the Formulas

Ideal weight formulas are population averages that do not account for individual factors like muscle mass, bone density, body frame size, and genetic variation. A muscular athlete may weigh significantly more than formula estimates while being perfectly healthy. Age, fitness level, and body composition matter more than a number on a scale. Use these estimates as general guidelines rather than strict targets, and combine with body fat percentage and health markers for a complete picture.

Setting Healthy Weight Goals

If your current weight differs significantly from calculated ideals, set incremental goals of 5 to 10 percent body weight reduction rather than targeting the formula output immediately. Gradual changes are more sustainable and healthier than rapid weight loss. Focus on body composition improvements rather than scale weight alone. Our BMI Calculator, Body Fat Calculator, and Fitness Guide provide complementary tools for comprehensive health assessment and planning.

Body Frame Size Considerations

Ideal weight formulas produce different results because they were developed from different population samples and assumptions. Frame size significantly affects appropriate weight: a large-framed individual naturally weighs more than a small-framed person of the same height without being overweight. Estimate frame size by wrapping your thumb and middle finger around your wrist. If they overlap, you have a small frame. If they touch, medium frame. If they do not touch, large frame. Adjust ideal weight estimates upward for large frames and downward for small frames by approximately 10 percent.

Frequently Asked Questions

How is ideal body weight calculated?

This calculator estimates ideal weight using several established formulas, including the Robinson, Miller, Devine, and Hamwi methods, which each use your height and sex to suggest a target range. Because these formulas were developed for different purposes and populations, they produce slightly different results, which is why the tool shows a range rather than a single number. Presenting multiple methods gives a more balanced picture than relying on any one formula, and helps you see a realistic healthy band rather than a single rigid figure.

Why do the formulas give different results?

Each ideal-weight formula was created at a different time, for different reference groups, and with different assumptions about body composition. The Hamwi and Devine formulas, for instance, originated in clinical dosing contexts, while others were refined for broader use. None accounts for individual differences in muscle mass, bone density, or body frame. Seeing the spread between formulas is useful because it reminds you that healthy weight is a range, not a precise target.

Does ideal weight account for muscle and body frame?

No. Standard ideal-weight formulas use only height and sex, so they cannot distinguish between muscle and fat or adjust for a naturally larger or smaller frame. A very muscular person may exceed the suggested range while carrying little excess fat, and someone with a slight frame may sit comfortably below it. For a fuller picture, combine ideal-weight estimates with measures such as body-fat percentage and waist circumference.

Is ideal weight the same as a healthy weight?

Not exactly. Ideal-weight formulas offer a useful reference, but a healthy weight depends on many factors including body composition, fitness, age, and overall health. Two people at the same weight can have very different health profiles. Rather than fixating on a single number, it is generally more helpful to focus on healthy habits, sustainable nutrition, regular activity, and guidance from a healthcare professional.

How should I use my ideal weight result?

Treat the result as a general reference range to inform goal-setting, not as a strict prescription. If your current weight sits well outside the suggested range, it may be worth discussing with a doctor or dietitian who can consider your full circumstances. Use the figure to set realistic, gradual targets, and remember that body composition and how you feel often matter more than hitting an exact number on the scale.