Your ideal weight range, adjusted for frame size and build
💡 Why This Matters A single "ideal weight" number ignores whether you're naturally small-boned or big-boned, lean or muscular. This calculator adjusts for your actual frame and build, and works out your body shape from real measurements — not a guess.
Two people can be the exact same height and weight and have completely different body compositions — one could be carrying mostly muscle, the other mostly fat. That's why frame size and body fat estimates matter more than weight alone.
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This calculator combines three separate, independently validated methods. Frame size comes from your wrist circumference relative to your height, using the standard clinical chart (small/medium/large boned). Body fat percentage comes from the U.S. Navy method, a tape-measure formula using neck, waist, height, and — for women — hip circumference. Body shape is derived from your waist-to-hip ratio. All three combine to adjust the baseline Devine ideal weight formula into a wider, more realistic range.
Instead of one flat number, you get a range: a small frame or lower body fat percentage nudges the range down, while a large frame or higher muscle/fat proportion nudges it up. Your body shape label (pear, apple, hourglass, or rectangle) describes how your weight is distributed, not how much of it there is.
All three underlying methods are estimates, not diagnostics. The Navy body fat formula is generally accurate within a few percentage points but isn't as precise as a DEXA scan. Frame size charts are based on population averages and may not perfectly fit every individual. Waist-to-hip ratio shape labels are a simplification — real bodies rarely fit one category perfectly.
Use the adjusted range as a more personalized reference point than a single ideal-weight number, especially if you're muscular, larger-framed, or petite-framed. Re-measure every few months if you're tracking changes, since body composition shifts don't always show up on a bathroom scale.
Example: A 6ft man with a 40.2" waist and 15.2" neck has a Navy-method body fat estimate of about 26.8%. With a wrist of 7.5", he falls into the large-frame category for his height, which nudges his ideal weight range upward from the base Devine estimate.
Standard ideal weight formulas use only height and sex. This calculator adds your wrist-based frame size and body composition, so a naturally larger-framed or more muscular person gets a range that fits them better instead of one flat number.
Body shape here is calculated from your waist-to-hip ratio, not self-reported. This keeps the result based on an actual measurement rather than a guess in the mirror.
The Navy method used here is a validated field estimate, generally within a few percentage points of more precise methods like DEXA scans. It's a strong estimate for everyday use, not a clinical diagnostic.