cm

inches

American

English

French

cm

inches

48

18.73

6

5.875

0.5

41.0

15.99

49

19.13

6.125

6

1

41.8

16.32

50

19.52

6.25

6.125

1.5

42.7

16.66

51

19.91

6.375

6.25

2

43.5

17.00

52

20.30

6.5

6.375

2.5

44.4

17.33

53

20.70

6.625

6.5

3

45.2

17.67

54

21.09

6.75

6.625

3.5

46.1

18.00

55

21.48

6.875

6.75

4

46.9

18.34

56

21.88

7

6.875

4.5

47.8

18.67

57

22.27

7.125

7

5

48.7

19.01

58

22.66

7.25

7.125

5.5

49.5

19.34

59

23.05

7.375

7.25

6

50.4

19.68

60

23.45

7.5

7.375

6.5

51.2

20.01

61

23.84

7.625

7.5

7

52.1

20.35

62

24.23

7.75

7.625

7.5

52.9

20.68

63

24.62

7.875

7.75

8

53.8

21.02

64

25.02

8

7.875

8.5

54.6

21.35

Square size

Hat size

Head circumference

"IJ Fedora" Size Chart

[square side] = [head circumference]/1.1716