A few sites that feature conversion charts from U.S. to U.K. shoe sizes are Zappos.com, ShoeMetro.com, ASICSAmerica.com and OnlineConversion.com. Each of these sites contains different features for converting shoe sizes.
Zappos.com features several different conversion charts including sizes for men, women, big kids, little kids, toddlers and infants. Shoe Metro has several different conversion charts as well, each of which compares inches to centimeters for a precise measure. ASICS includes many of the above-mentioned charts, and also features a chart exclusively for wrestling shoes. OnlineConversion.com allows users to select their country's shoe size, which then brings up conversions for several different countries including the U.K., Japan, Mexico, Korea and Australia.