Circumference (mm)

UK size

44

F

44.5

F½

45

G

45.5

G½

46

H

46.5

H½

47-47.5

I

48

I½

48.5

J

49-49.5

J½

50

K

50.5

K½

51-51.5

L

52

L½

52.5

M

53

M½

53.5-54

N

54.5

N½

55

O

55.5

O½

56

P

56.5-57

P½

57.5

Q

58

Q½

58.5-59

R

59.5

R½

60

S

60.5

S½

61-61.5

T

62-62.5

T½

63

U

63.5

U½

64

V

64.5

V½

65

W

65.5-66

W½

66.5

X

67

X½

67.5

Y

68

Y½

68.5

Z

69-69.5

Z½

70-70.5

Z+1

71-72.5

Z+2

73-79.5

Z+3