What Is Your Ideal Weight for Your Height?

"What should I weigh?" is one of the most common health questions people ask — and one of the most misunderstood. Ideal body weight formulas give a useful reference point based on your height, but they are estimates, not verdicts. This guide explains how ideal weight is calculated, where the popular formulas came from, why the number is only part of the picture, and how to use it sensibly alongside other measures like BMI and body composition.

This article is for general education only and is not medical advice. For guidance about your own weight and health, speak with a qualified healthcare professional.

How ideal weight is estimated

Ideal body weight (IBW) formulas were originally developed in medical settings — often to help with medication dosing — and they work from a simple idea: taller people should, on average, weigh more. The classic formulas start with a base weight at a reference height and add a set amount for every additional inch or centimetre. They also adjust for sex, since body composition differs on average between men and women. The result is a single figure that represents a reasonable, healthy weight for that height.

The popular formulas

Several named formulas exist, and while the exact numbers differ, they all follow the same "base plus a bit per unit of height" structure:

• Devine formula — the most widely used, originally created for medication dosing and still a common reference.
• Robinson and Miller formulas — refinements that adjust the base and per-inch amounts slightly.
• Hamwi formula — a quick clinical estimate long used by dietitians.

Because they differ a little, a good calculator often shows several at once, giving you a small range rather than one rigid number — which is a more honest way to think about a healthy weight.

Why it is only part of the picture

Here is the crucial caveat: these formulas know only your height and sex. They cannot see your muscle, your frame size or how your weight is distributed. A muscular athlete may weigh well above their "ideal" figure while being extremely fit, because muscle is denser than fat. Someone with a naturally larger or smaller frame will sit at a different healthy weight from someone the same height with a slimmer build. That is why the ideal weight number should be treated as a ballpark, not a bathroom-scale command.

How it relates to BMI

Body Mass Index (BMI) approaches the same question from a different angle: instead of giving a target weight, it puts your current weight-for-height into a category. The two work well together. An ideal weight formula suggests roughly where a healthy weight might sit, while BMI tells you which broad range your actual weight falls into. Both share the same limitation — neither can distinguish muscle from fat — so both are best read as general indicators rather than precise diagnoses.

Using the number wisely

The healthiest way to use an ideal weight figure is as a gentle reference for reflection, not a source of pressure. A few sensible habits:

• Treat the result as a range, not a single "correct" number.
• Consider it alongside how you feel, your energy, and your fitness — not in isolation.
• Remember that body composition and frame size legitimately shift the picture.
• Talk to a healthcare professional before setting any weight goal, especially a significant one.

Conclusion

Ideal body weight formulas offer a helpful, height-based starting point for thinking about a healthy weight — but they are estimates that cannot account for muscle, frame or the individual person. Read the number as a range, pair it with BMI and, above all, with professional guidance. To see the common formulas for your height in one place, try the Ideal Weight Calculator.