Ideal Weight Calculator

See your ideal body weight by the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI range for your height.

Ideal weight (Devine)
155.9

The four formulas span 68.9–72.3 kg (152–159 lb).

Ideal weight by formula
020406080Devine — Weight: 70.7DevineRobinson — Weight: 69.1RobinsonMiller — Weight: 68.89MillerHamwi — Weight: 72.3HamwiBMI 18.5 — Weight: 56.825BMI 18.5BMI 24.9 — Weight: 76.483BMI 24.9
Robinson (1983)
152.3
Miller (1983)
151.9
Hamwi (1964)
159.4
Healthy BMI range from
125.3
Healthy BMI range to
168.6
Show the working
  1. Height = 69.0 in, i.e. 9.0 in over 5 ft
  2. Devine = 50 + 2.3 × 9.0 = 70.7 kg

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Formula

Devine: men 50 kg + 2.3 kg per inch over 5 ft; women 45.5 kg + 2.3 kg/inRobinson: men 52 kg + 1.9 kg/in; women 49 kg + 1.7 kg/inMiller: men 56.2 kg + 1.41 kg/in; women 53.1 kg + 1.36 kg/inHamwi: men 48 kg + 2.7 kg/in; women 45.5 kg + 2.2 kg/inHealthy BMI range: 18.5 × height² to 24.9 × height² (height in m)

How it works

"Ideal body weight" formulas were created mainly for clinical use — for example, to dose certain drugs — rather than as a weight-loss target. Each starts from a base weight at 5 feet tall and adds a fixed amount for every additional inch.

The Devine formula (1974) is the most widely used in hospitals and is shown as the headline number. Robinson and Miller are later refinements based on population data, and Hamwi is an older rule of thumb. Taken together they give a sensible ballpark, and the spread between them is a reminder that there is no single correct number.

None of these formulas consider frame size, muscle mass or age. The healthy BMI range is wider and often more practical: anywhere within it is generally associated with lower health risk. This is general information, not medical advice.

Frequently asked questions

Which formula is the most accurate?

None is "accurate" for an individual, because they ignore body composition. Devine is the clinical standard; Robinson and Miller tend to give slightly lower values for tall men.

I am muscular and above my ideal weight. Is that a problem?

Not necessarily. Muscle is dense, so athletic people often weigh more than these formulas suggest. A body-fat or waist-to-height measurement is more informative.

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