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.
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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 weight concerns in someone with a genuinely small frame and higher body fat.
What should I know about 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.
What should I know about 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.
What's the difference between BMI and 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 percentage, and waist circumference gives a far more complete picture than relying on any single measurement alone.