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Ideal Weight Calculator

Estimate a healthy target weight range based on your height and sex.

Devine Formula70.5 kg
Robinson Formula68.9 kg
Hamwi Formula72.0 kg

Related Guide

Ideal Weight Calculator: Comparing the Devine, Robinson & Hamwi Formulas

Read Guide →

About This Tool

Free ideal weight calculator online — enter your height and sex to estimate a healthy target weight using several established medical formulas (Devine, Robinson, and Hamwi), shown side by side for comparison. No sign-up, no upload, entirely browser-based. These formulas were originally developed for medical dosing calculations and have since become common reference points for a healthy body weight target. Because no single formula is universally "correct," seeing all three together gives a more realistic range than relying on just one number.

How to Use

  1. 1

    Select your sex

    Choose male or female — each formula uses a different base calculation and adjustment per inch.

  2. 2

    Enter your height

    Input your height in centimeters or feet/inches.

  3. 3

    Compare the results

    See your ideal weight estimate from the Devine, Robinson, and Hamwi formulas side by side.

Frequently Asked Questions

Which ideal weight formula is most accurate?+
No single formula is definitively "most accurate" — they were developed decades apart for different purposes. Most people fall within the range these formulas produce collectively, which is why comparing all three is more useful than relying on just one.
Does this account for muscle mass?+
No — like BMI, these formulas are based purely on height and sex, not body composition. Someone with high muscle mass may naturally weigh more than these formulas suggest while still being lean and healthy.
Should I use this as a strict target?+
Treat it as a general reference range rather than a strict target. Individual factors like frame size, muscle mass, and overall health matter more than hitting an exact number.

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