Calculator Body
Ideal weight calculator
There's no single "ideal" number — the clinical formulas each land a little differently, which is why a healthy range is more honest than one figure. Enter your height and sex to see all four, plus the weight range that keeps your BMI in the healthy zone.
A healthy weight range for your height
0lb
By the numbers Context
What “ideal weight” really means
The idea of an ideal body weight comes from a handful of formulas — Devine, Robinson, Miller, and Hamwi — originally built to help with medication dosing, not to set a personal goal. Each uses only your height and sex, and each produces a slightly different number, which is exactly why this calculator shows all four alongside the weight range that maps to a healthy BMI. A range is simply more honest than a single figure.
Because these formulas ignore muscle, frame, and body composition, they should be read loosely. A muscular, athletic person can weigh more than any of them suggest and be in excellent health, while the numbers can flatter someone who carries little muscle. Use the range as orientation, and let waist size, body fat, and how you feel carry as much weight as the scale.
4 formulas
clinical ideal-weight equations, each landing a little differently
Devine et al.
18.5–24.9
the healthy BMI band this range maps to
WHO
Sources: Devine, Robinson, Miller and Hamwi ideal-body-weight formulas; World Health Organization BMI ranges.
Frequently asked questions
How much should a woman of my height weigh?
There is no single answer — a healthy weight is a range, not a point. For example, the healthy BMI band (18.5–24.9) for a 5-foot-4 woman spans roughly 108 to 145 pounds. This calculator gives your specific range plus four formula estimates.
What is my ideal weight?
This calculator shows a range rather than one number: the Devine, Robinson, Miller, and Hamwi formula estimates for your height and sex, alongside the weight range that keeps your BMI in the healthy zone.
Does ideal weight change with age?
The formulas do not adjust for age, but interpretation does: in older adults, a slightly higher weight can be protective. Muscle also naturally declines with age, so composition matters more than the scale over time.
Are ideal weight formulas accurate?
They are useful ballpark tools, but they use only height and sex and ignore muscle and frame, so they should be read as a range and a starting point — not a precise or personal target.
How is ideal weight calculated?
Each formula starts from a base weight for a 5-foot person of your sex and adds a set amount per inch of height above that. This calculator runs all four and adds the healthy BMI range for context.