NIKE (specific to men's models only)
Women should subtract 1.5 from their regular US size to get their size in men's. eg if you're usually a womens 6.5, your size in men's footwear would be US5)

US (default) 3.5 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 13
UK 2.5 3 3.5 4 5 5.5 6 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 12

 EUR

35.5 36

 36.5

 37.5

 38

38.5 

39

40 40.5

41

42 42.5 43 44 44.5 45 45.5 46 47.5
CN 22cm 22.5cm 23 23.5cm 24cm 24cm  24.5cm 25cm 25.5cm 26cm 26.5cm 27cm 27.5cm 28cm 28.5cm 29cm 29.5cm 30cm 31cm

 

 NIKE (specific to women's models)

 US (default) 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12
UK 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5
EUR 35.5 36 36.5

37.5

38 38.5 39 40 40.5 41 42 42.5 43 44 44.5
CN 22cm 22.5cm 23cm 23.5cm 24cm 24.5cm 25cm 25.5cm 26cm 26.5cm 27cm 27.5cm 28cm 28.5cm 29cm