The Following is a chart showing foot dimensions and their relative boot sizes.
Foot LengthBoot Size
    US AUS  AUS   Mondo
Inch Cm Men Women UK Europe Point
8 20.3 2 3 1 33.0 21.3
8 1/6 20.7 33.6 21.7
8 1/3 21.2 3 4 2 34.3 22.2
21.6 34.9 22.6
8 2/3 22.0 4 5 3 35.5 23.0
8 5/6 22.4 36.2 23.4
9 22.9 5 6 4 36.8 23.9
9 1/6 23.3 37.5 24.3
9 1/3 23.7 6 7 5 38.1 24.7
24.1 38.7 25.1
9 2/3 24.6 7 8 6 39.4 25.6
9 5/6 25.0 40.0 26.0
10 25.4 8 9 7 40.6 26.4
10 1/6 25.8 41.3 26.8
10 1/3 26.2 9 10 8 41.9 27.2
10½ 26.7 10½ 42.5 27.7
10 2/3 27.1 10 11 9 43.2 28.1
10 5/6 27.5 10½ 11½ 43.8 28.5
11 27.9 11 12 10 44.5 28.9
11 1/6 28.4 11½ 12½ 10½ 45.1 29.4
11 1/3 28.8 12 13 11 45.7 29.8
11½ 29.2 12½ 13½ 11½ 46.4 30.2
11 2/3 29.6 13 14 12 47.0 30.6
11 5/6 30.1 13½ 14½ 12½ 47.6 31.1
12 30.5 14 15 13 48.3 31.5
12 1/6 30.9 14½ 15½ 13½ 48.9 31.9
12 1/3 31.3 15 16 14 49.5 32.3
12½ 31.7 15½ 16½ 14½ 50.2 32.7
12 2/3 32.2 16 17 15 50.8 33.2
12 5/6 32.6 16½ 17½ 15½ 51.5 33.6
13 33.0 17 18 16 52.1 34.0
13 1/6 33.4 17½ 18½ 16½ 52.7 34.4
13 1/3 33.9 18 19 17 53.4 34.9
Inch Cm US US UK Europe Mondo
    Men Women     Point
Inter size gap 1/3" 1/3" 1/3" 2/3 Cm 1 Cm
Inter size gap " 1/3" 1/3" 1/3" 0.26" 0.39"
Inter size gap mm 8.5 mm 8.5 mm 8.5 mm 6.7 mm 10 mm