Which formula is most accurate?

No single formula is universally best. The Devine formula is the oldest and most cited in clinical settings. Robinson and Miller (both 1983) were developed as refinements. Hamwi is often used by dietitians. The consensus range across formulas is more meaningful than any single value.

What is frame size and how do I determine mine?

Frame size refers to your bone structure. A common estimation method: wrap your thumb and middle finger around your wrist. If they overlap you have a small frame; if they touch, medium; if they don't meet, large.

Is ideal body weight the same as healthy weight?

Not exactly. IBW formulas were developed for clinical dosing (e.g., medication, ventilator settings) rather than as fitness goals. The BMI-based healthy weight range (18.5–24.9) is a separate measure. Both are estimates and do not account for muscle mass, age, or ethnicity.

Why are there separate values for male and female?

The formulas were empirically derived from population data and include sex as a variable because average body composition, bone density, and height differ between males and females on a population level.

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Ideal Weight Calculator

Calculate your ideal body weight using four medical formulas.

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About this tool

This tool estimates your ideal body weight (IBW) using the four most widely cited clinical formulas — Robinson (1983), Miller (1983), Devine (1974), and Hamwi (1964). Enter your height in centimeters or feet/inches, select your biological sex, and choose your frame size. The results table compares all four formulas side by side, while a healthy BMI weight range (18.5–24.9) provides additional context. A visual gauge shows where the formula estimates cluster. These values are general guidelines — always consult a healthcare professional for personalized advice.

How to use

1 Select your unit system: centimeters or feet/inches.
2 Enter your height.
3 Choose your biological sex (male or female).
4 Select your frame size: small, medium, or large.
5 View the results table comparing all four formulas.
6 Compare with the healthy BMI weight range shown below the table.

Frequently Asked Questions

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