Barker Black Shoes tend to run a half size large, if you normally wear a size 10 in US shoes please order a size 9.5.

US UK EU
7 6.5 39.5
7.5 7 40
8 7.5 40.5
8.5 8 41
9 8.5 41.5
9.5 9 42
10 9.5 42.5
10.5 10 43
11 10.5 43.5
11.5 11 44
12 11.5 44.5
12.5 12 45
13 12.5 45.5