How to Calculate Ideal Body Weight

An ideal body weight calculator estimates a healthy weight based on height and sex using established medical formulas. It serves as a general guideline, not an absolute target.

The Formula

Devine: IBW (kg) = 50 + 2.3 x (Height in inches - 60) [male]

Where:

IBWIdeal Body Weight — Estimated healthy weight target
HHeight — Your height in inches
2.3Height Factor — Weight added per inch over 5 feet

Step-by-Step Example

Here's how to calculate ideal body weight step by step:

  1. 1Measure height: Convert your height to inches (feet x 12 + remaining inches).
  2. 2Subtract 60 inches: Find how many inches you are over 5 feet tall.
  3. 3Apply formula: For males: 50 + 2.3 x extra inches. For females: 45.5 + 2.3 x extra inches.

Following these 3 steps gives you the final ideal body weight value.

Skip the Math

A 5'10" male: IBW = 50 + 2.3 x (70-60) = 73 kg (161 lbs). A healthy range would be roughly 149-174 lbs.

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Why You Need This Calculation

  • Ideal weight estimates provide a healthy weight range target based on height and sex for goal setting.

Common Mistakes

Treating ideal weight as an exact number.

It is a range estimate; healthy weight varies by body composition and frame size.

Using only one formula.

Compare Devine, Robinson, and Hamwi formulas for a reasonable range.

Applying adult formulas to children.

Children should use age-specific growth charts instead.

Frequently Asked Questions