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United Kingdom Size 38–40 to US: M (31–33)

Cross-market men’s underwear and boxer brief conversion mapping 38–40 specifications into M (31–33).

From Standard & Size
UK
Converted Equivalent
US
XL (38–40)
Based on row equivalence: US XL (38–40) | EU 54–56
Standard cross-walk matching active anthropometric row parameters.
United Kingdom Size 38–40 to US: M (31–33) Conversion

Analyzing Underwear Size Equivalence Across Markets

United Kingdom Size 38–40: Corresponds to a waist stretch range of 96.5–101.6 cm\text{cm} (38–40 in\text{in}), hip circumference of 111.8 cm\text{cm} (44 in\text{in}), thigh clearance of 63 cm\text{cm} (24.8 in\text{in}), and fit style Relaxed Boxers & Extended Boxer Briefs.

US: M (31–33): Corresponds to a waist stretch range of 78.7–83.8 cm\text{cm} (31–33 in\text{in}), hip circumference of 96.5 cm\text{cm} (38 in\text{in}), thigh clearance of 55 cm\text{cm} (21.7 in\text{in}), and fit style Briefs, Boxers & Boxer Briefs.

Other Conversions to US: M (31–33)

United Kingdom Size 26–28 → us-m-31-3326–28 to us-m-31-33
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United Kingdom Size 28–30 → us-m-31-3328–30 to us-m-31-33
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United Kingdom Size 31–33 → us-m-31-3331–33 to us-m-31-33
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United Kingdom Size 34–36 → us-m-31-3334–36 to us-m-31-33
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United Kingdom Size 38–40 → us-m-31-3338–40 to us-m-31-33
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United Kingdom Size 42–44 → us-m-31-3342–44 to us-m-31-33
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United Kingdom Size 46–48 → us-m-31-3346–48 to us-m-31-33
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