Crocs Women's Shoes Size Chart:

U.S.A. 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12
U.K. 33.5 34 34.5 35.5 36.5 37 37.5 38 38.5 39 39.5 40 41 42 42.5 43 45

Crocs Men's Shoes Size Chart:

U.S.A. 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 16
U.K. 38 38.5 39.5 40 41 42 42.5 43 43.5 44 44.5 45 45.5 46.5 47.5 48 48.5 49 49 50-51

Crocs Unisex Shoes Size Chart:

Men's U.S.A 4 5 6 7 8 9 10 11 12 13 14 15
Women's U.S.A 6 7 8 9 10 11 12 - - - - -