Ideal Weight for Women — Healthy Ranges by Height and Age

There is no single number that is “ideal” for every woman at a given height. What health organisations actually publish is a healthy weight range, built from the body mass index (BMI) formula, alongside older sex-specific formulas that estimate one point estimate rather than a range. Here’s how each is calculated, what a healthy range looks like at common heights, and why frame size and muscle mass matter more than the number on the scale.

How a “Healthy Weight Range” Is Actually Defined

The most widely used method is BMI: weight in kilograms divided by height in metres squared. The CDC and WHO both define 18.5–24.9 kg/m² as the healthy range for adults, regardless of sex. That’s a range, not a target — two women of the same height can both be in a healthy range at noticeably different weights, largely because of muscle mass, bone density, and body composition.

Separately, older clinical formulas — Devine, Robinson, Miller, and Hamwi — estimate a single “ideal body weight” figure rather than a range. These were originally built for medication dosing in hospitals, not as a personal weight-loss target. We break each one down, with the exact equations, in our ideal body weight formulas guide.

Healthy Weight Range for Women by Height

Using the standard BMI range of 18.5–24.9, here’s what a healthy weight range looks like at common heights:

These ranges apply the same formula used for men — BMI itself isn’t sex-specific. What differs between men and women, on average, is where in that range a healthy body composition tends to land, because typical muscle mass and essential fat percentage differ by sex.

Does “Ideal Weight” Change With Age?

The standard healthy BMI range itself doesn’t shift by age in most guidelines. What changes is body composition: after menopause, many women lose some lean muscle mass and gain proportionally more fat even at a stable weight, which is one reason two women at the same weight and height can look and function very differently. Some geriatric research suggests a slightly higher weight may be protective for women over 65 — we cover that evidence in detail in our BMI for older adults guide.

Weight Alone Isn’t the Full Picture

Waist circumference, waist-to-hip ratio, and simply how your clothes fit often tell you more about body composition changes than the scale does, especially over months rather than days. A stable or even slightly increasing weight alongside a shrinking waist usually means muscle is replacing fat — a positive change that the scale alone won’t show you.