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Ideal Weight Calculator

Find your ideal body weight range using established medical formulas including Devine, Hamwi, Miller, and Robinson equations.

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About this Calculator

Find your ideal body weight range using established medical formulas including Devine, Hamwi, Miller, and Robinson equations.

Formula & Calculations

Formula

Devine: Male 50 + 2.3 × (height in - 60), Female 45.5 + 2.3 × (height in - 60) | Hamwi, Miller, Robinson variations apply similar linear models.
Where:
  • IBW=Ideal Body Weight in kilograms
  • height=Height in inches for formula input (converted from cm or ft/in)

Assumptions

  • Ideal weight formulas were originally developed for calculating medication dosages and may not reflect individual health goals.
  • These formulas do not account for body composition, muscle mass, or frame size (though Hamwi includes frame adjustments).
  • Results are estimates and should be used as a general reference, not a clinical target.

Calculation Examples

Example 1

Inputs:Male, Height: 180 cm (5'11")
Result:Devine: 75.3 kg, Hamwi: 77.7 kg, Miller: 71.7 kg, Robinson: 72.9 kg

All formulas use height in inches minus 60 inches (5 feet) as the base. Devine: 50 + 2.3 × 10.87 = 75.0 kg.

Example 2

Inputs:Female, Height: 165 cm (5'5")
Result:Devine: 57.0 kg, Hamwi: 56.5 kg, Miller: 59.9 kg, Robinson: 57.5 kg

Devine: 45.5 + 2.3 × 5 = 57.0 kg. Each formula is calibrated differently based on its original study population.

Frequently Asked Questions

Why do different formulas give different results?

Each formula was derived from different population studies and served different clinical purposes. Devine was developed for medication dosing, Hamwi for diabetes management, and Robinson/Miller from actuarial data. The variation between formulas illustrates that 'ideal weight' is a range, not a single number.

Is ideal weight the same as healthy weight?

Not necessarily. Ideal weight formulas are mathematical estimates that don't consider body composition. A muscular person may weigh more than their 'ideal weight' yet be perfectly healthy. BMI categories provide a broader healthy weight range that may be more practical.

Which ideal weight formula should I use?

The Devine formula is the most widely used in clinical settings. However, rather than picking one formula, it is best to consider the range across all four formulas as your general ideal weight window.