Ideal Body Weight Calculator

Work out ideal body weight instantly with clear inputs, formula shown and shareable results.

About Ideal Body Weight Calculator

Ideal body weight formulas all take a base weight at five feet and add a fixed amount per inch above it. Devine gives 50 kg plus 2.3 kg per inch for men, so 1.75 m (68.9 inches) yields 70.5 kg. Robinson and Miller give lower figures and Hamwi higher; all four were designed for drug dosing rather than as aesthetic targets.

Formulas

Devine formula

men: 50 + 2.3 kg per inch over 5 ft; women: 45.5 + 2.3

Robinson formula

men: 52 + 1.9 per inch; women: 49 + 1.7

Worked example

With the default values below, Ideal Body Weight Calculator returns Ideal Body Weight of 70.5. Change any input above and every figure here is recalculated in your browser.

Inputs used

Heightminimum 100 cm: 175 cm
Sexone of Male, Female: Male
Formulaone of Devine (1974), Robinson (1983), Miller (1983), Hamwi (1964): Devine (1974)

Results

Ideal Body Weight: 70.5 kg
BMI At That Weight: 23.01 kg/m2
Devine Formula Result: 70.5 kg
Inches Above Five Feet: 8.90

Step by step

1Values used
2Devine formula
3Robinson formula
4Ideal Body Weight= 70.5 kg
5BMI At That Weight= 23.01 kg/m2
6Devine Formula Result= 70.5 kg
7Inches Above Five Feet= 8.90

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.

Frequently Asked Questions

Which formula is best?

None is authoritative. Devine dominates clinical pharmacy purely by convention; Robinson fits population data marginally better.

Should I aim for my ideal body weight?

Not necessarily. A healthy BMI range is broad, and these formulas ignore muscularity and frame size entirely.