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⚖️ Ideal Weight Calculator

Find your ideal body weight using four medically established formulas — Devine, Robinson, Miller, and Hamwi — plus the healthy BMI weight range for your height.

cm ft/in

The Four Formulas

Devine (1974)
Male: 50 + 2.3 × (inches over 5ft) kg
Female: 45.5 + 2.3 × (inches over 5ft) kg
Robinson (1983)
Male: 52 + 1.9 × (inches over 5ft) kg
Female: 49 + 1.7 × (inches over 5ft) kg
Miller (1983)
Male: 56.2 + 1.41 × (inches over 5ft) kg
Female: 53.1 + 1.36 × (inches over 5ft) kg
Hamwi (1964)
Male: 48 + 2.7 × (inches over 5ft) kg
Female: 45.5 + 2.2 × (inches over 5ft) kg

How to Use This Calculator

  1. 1
    Select Your Gender
    All four ideal weight formulas use separate equations for males and females.
  2. 2
    Enter Your Height
    Use the toggle to switch between cm and ft/in. The formulas are based on height in inches above 5 feet.
  3. 3
    Compare All Formulas
    See results from all four formulas side by side, plus the healthy BMI weight range for your height.
  4. 4
    Use the Average
    The average of all four formulas is shown as the main result and is a good general target range.

Real-World Example

Male, 175 cm (5ft 9in = 9 inches over 5ft):

Devine = 50 + 2.3 × 9 = 70.7 kg
Robinson = 52 + 1.9 × 9 = 69.1 kg
Miller = 56.2 + 1.41 × 9 = 68.9 kg
Hamwi = 48 + 2.7 × 9 = 72.3 kg
Average = 70.3 kg

Frequently Asked Questions

Ideal body weight (IBW) is an estimated weight target associated with good health outcomes for a given height. It was originally developed for drug dosing purposes but is widely used in nutrition and fitness as a general health target.

No single formula is universally most accurate. The Devine formula is the most widely used in clinical settings. The average of all four formulas is generally the best general-purpose estimate. Individual factors like muscle mass, bone density, and body composition are not captured by any formula.

People with larger bone frames naturally weigh more at the same height. A quick assessment: wrap your thumb and middle finger around your wrist — if they overlap you have a small frame; if they just touch, medium; if they do not touch, large frame. Add or subtract 10% from ideal weight for large or small frames.

Not exactly. The formula-based ideal weights and the BMI healthy range (18.5–24.9) often overlap but are not identical. BMI-based healthy weight is a range, while the formulas give a single point estimate. Both are useful references, but neither accounts for muscle mass or body composition.

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