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How Ideal Weight Formulas Work: Devine, Robinson, Miller & Hamwi

There is no single universally accepted formula for ideal weight, which is why our calculator uses four well-known equations. The Devine formula, created in 1974, is widely used in clinical settings for drug dosing. The Robinson formula offers a slightly different estimate that tends to be more generous for taller people. The Miller formula generally produces higher ideal weights, making it more realistic for people with larger frames. The Hamwi formula is one of the oldest and simplest methods. By comparing results from all four, you get a range rather than a single number, which better reflects the reality that healthy weight varies between individuals.

Ideal Weight vs. Goal Weight: What Is the Difference?

Your ideal weight according to a formula is a statistical estimate based on population averages, not a personalised prescription. Your goal weight should take into account your body composition, activity level, personal preferences, and how you feel at different weights. A competitive powerlifter and a marathon runner of the same height will have very different healthy weights. Instead of fixating on a single number, focus on a healthy range and use additional indicators like body fat percentage, waist-to-hip ratio, and energy levels. The best weight for you is one where you feel strong, energised, and can maintain your lifestyle sustainably.

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