Body Frame Size Calculator — Wrist Method
Find out whether you have a small, medium or large frame from your height and wrist circumference using two published methods, and see how frame size shifts a reference ideal weight.
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Wrist Size Bands at Your Height
Wrist circumferences for each frame size under the height ÷ wrist ratio method.
| Height | Small | Medium | Large |
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How this calculator works
Method 1 — height ÷ wrist ratio (r). Divide your height by your wrist circumference (same unit), then classify (Grant, 1980):
- Men: r above 10.4 = small · 9.6–10.4 = medium · below 9.6 = large
- Women: r above 11.0 = small · 10.1–11.0 = medium · below 10.1 = large
Method 2 — MedlinePlus wrist chart (U.S. National Library of Medicine), by height band:
- Women under 5′2″: small under 5.5″ · medium 5.5–5.75″ · large over 5.75″
- Women 5′2″–5′5″: small under 6″ · medium 6–6.25″ · large over 6.25″
- Women over 5′5″: small under 6.25″ · medium 6.25–6.5″ · large over 6.5″
- Men over 5′5″: small 5.5–6.5″ · medium 6.5–7.5″ · large over 7.5″ (the chart doesn't cover men 5′5″ and under)
The ideal-weight panel uses the Hamwi formula with the common ±10% frame adjustment, as a reference only.
By Suhaib Hassan · Reviewed 28 September 2026 against the published charts · How CalculatePilot verifies formulas →
Why frame size matters for weight goals
Ideal weight charts and BMI categories are based on averages that don't account for skeletal frame size — someone with a larger bone structure will naturally weigh more at the same body fat percentage than someone with a smaller frame. That's why frame size is sometimes used to adjust weight targets.
A worked example
A woman 5′5″ (65 in) tall with a 6.25″ wrist: 65 ÷ 6.25 = 10.4, which is a medium frame for women (10.1–11.0). On the MedlinePlus chart she falls in the 5′2″–5′5″ band, where 6–6.25″ is also medium, so both methods agree.
Measuring your wrist correctly
Measure around the wrist at the narrowest point, just below the wrist bone, using a flexible tape measure snug but not compressing the skin. Elbow breadth, measured with calipers, is another frame-size method used in research, but it needs equipment most people don't have. Like other simple anthropometric methods, the wrist method is a general estimate, not a clinical measurement.
Sources
- MedlinePlus Medical Encyclopedia — Calculating body frame size
- Grant JP. Handbook of Total Parenteral Nutrition. Philadelphia: WB Saunders, 1980.
- Hamwi GJ. Therapy: changing dietary concepts. In: Diabetes Mellitus: Diagnosis and Treatment. American Diabetes Association, 1964.
Frequently asked questions
Does frame size change how much I should weigh?
It's one factor some ideal-weight frameworks consider — a larger frame generally supports a somewhat higher healthy weight than a smaller frame at the same height, commonly by about 10% either way, though it's just one of many relevant factors.
Where exactly should I measure my wrist?
At the narrowest point of the wrist, just below the wrist bone — roughly where a watch strap would sit — using a flexible tape measure snug against the skin.
Why do the two methods sometimes disagree?
The ratio method scales smoothly with height, while the MedlinePlus chart uses broad height bands with fixed wrist ranges. Near a band edge they can land in neighbouring categories; if they differ, you're likely near the border between the two sizes.
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