Diameter (mm)

United States & Canada

Europe

UK, Australia & South Africa

India

China

Singapore & Japan

Hong Kong

14.01

3

44

F½

4

6

4

6

14.33

45

G

5

5

14.5

3½

G½

7

7.5

14.65

46

H

6

6

14.97

4

47

H½

7

8

7

9

15.1

I

9

15.29

4½

48

I½

8

8

10

15.5

J

15.61

5

49

J½

9

10

9

11

15.92

50

K

10

16.1

5½

K½

11

10

12

16.24

51

L

11

16.56

6

52

L½

12

12

11

13

16.7

M

13

12

16.88

6½

53

M½

13

13

14.5

17.1

N

14

17.2

7

54

N½

14

14

16

17.52

55

O

15

15

17.7

7½

O½

15

17

17.83

56

P

16

16

18.15

8

57

P½

17

17

16

18.2

18

18.3

Q

18.47

8½

58

Q½

18

18

17

19

18.79

59

R

19

19.0

9

R½

19

18

20.5

19.11

60

S

20

20

19.43

9 ½

61

S½

21

19

22

19.6

T

21

19.75

10

62

T½

22

20

23

20.0

U

23

22

21

20.06

10½

63

U½

24

22

24

20.38

64

V

23

20.6

11

V½

25

23

25

20.70

65

W

24

21.02

11½

66

W½

26

25

24

26

21.2

X

21.34

12

67

X½

27

26

25

27.75

21.6

Y

28

21.66

12½

68

Z

26

21.97

69

Z½

29

22.29

13

70

30

27

30

22.4

Z+1

22.61

13½

71

Z+2

31

22.9

32

23.2

33

23.5

34

23.9

35

24.2

36