United Kingdom Size 16–18 to US: M (8–10)
Cross-market women’s underwear, panty, and thong conversion mapping 16–18 specifications into M (8–10).

Analyzing Women’s Underwear Size Equivalence Across Markets
United Kingdom Size 16–18: Waist contouring range of 76.2–81.3 (30–32 ), full hip range of 101.6–106.7 (40–42 ), style variants Briefs, High-Waist Panties & Boy Shorts, and fit classification Comfort Stretch Fit.
US: M (8–10): Waist contouring range of 71.1–73.7 (28–29 ), full hip range of 96.5–99.1 (38–39 ), style variants Panties, Briefs, Bikinis & Boy Shorts, and fit classification Classic Regular Fit.
Other Conversions to US: M (8–10)
United Kingdom Size 4–6 → us-m-8-104–6 to us-m-8-10
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United Kingdom Size 8–10 → us-m-8-108–10 to us-m-8-10
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United Kingdom Size 12–14 → us-m-8-1012–14 to us-m-8-10
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United Kingdom Size 16–18 → us-m-8-1016–18 to us-m-8-10
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United Kingdom Size 20–22 → us-m-8-1020–22 to us-m-8-10
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United Kingdom Size 24–26 → us-m-8-1024–26 to us-m-8-10
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United Kingdom Size 28–30 → us-m-8-1028–30 to us-m-8-10
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