Ideal Weight by Frame Size Calculator
Find your ideal weight range personalised to your frame size — small, medium, or large. More accurate than standard ideal weight tables that ignore build.
Frame Size and Ideal Weight Guide
Why Frame Size Matters
Bone structure and muscle density vary significantly between individuals of the same height. A large-frame person has heavier bones and typically more muscle mass — their ideal weight is genuinely higher than a small-frame person of the same height, not due to excess fat but due to structural differences. Applying a single ideal weight number regardless of frame can make large-frame individuals feel perpetually 'overweight' even at a healthy body composition, while potentially masking genuine we
Measuring Your Frame Size
Wrist circumference method: circle your non-dominant wrist just below the wrist bone with your opposite thumb and middle finger. If they overlap: small frame. If they just meet: medium frame. If they do not meet: large frame. For women: small (wrist under 14cm), medium (14–16cm), large (over 16cm). For men: small (under 16cm), medium (16–19cm), large (over 19cm). Elbow breadth (measured with arm raised, elbow bent at 90°) is the most accurate but requires calipers.
Frame Adjustment to Ideal Weight
The Hamwi formula provides a medium-frame baseline: men 48kg for 5 feet + 2.7kg per inch above (or 48 + 1.06 per cm over 152cm). Women 45.4kg + 2.27kg per inch above 5 feet. Frame adjustment: subtract 10% for small frame, add 10% for large frame. This gives a range of approximately 10–15 kg from small to large frame for any given height. Example: 5'9" (175cm) male medium frame baseline = 72.5kg. Small frame: 65kg. Large frame: 80kg.
BMI vs Frame-Adjusted Ideal Weight
Standard BMI (18.5–24.9) does not account for frame size and treats all individuals of the same height identically. Frame-adjusted ideal weight typically falls in the BMI 19–24 range for medium frame, 17–22 for small frame, and 21–26 for large frame individuals. Athletes with high muscle mass may have a healthy body composition at BMI 26–28 if their bone and muscle mass account for the 'excess' weight. For practical health assessment, combining BMI, frame-adjusted ideal weight, body fat %, and w
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