Nike men's to women's and women's to men's shoe sizes

Convert Nike men's to women's or women's to men's US shoe sizes using only pairs printed together in the brand's official charts.

Men's to women's

At Nike, women's US is 1.5 above men's US: men's 9 is women's 10.5.

From Nike's men's chart.

Men's US	Women's US	UK	EU	cm
3.5	5	3	35.5	22.5
4	5.5	3.5	36	23
4.5	6	4	36.5	23.5
5	6.5	4.5	37.5	23.5
5.5	7	5	38	24
6	7.5	5.5	38.5	24
6.5	8	6	39	24.5
7	8.5	6	40	25
7.5	9	6.5	40.5	25.5
8	9.5	7	41	26
8.5	10	7.5	42	26.5
9	10.5	8	42.5	27
9.5	11	8.5	43	27.5
10	11.5	9	44	28
10.5	12	9.5	44.5	28.5
11	12.5	10	45	29
11.5	13	10.5	45.5	29.5
12	13.5	11	46	30
12.5	14	11.5	47	30.5
13	14.5	12	47.5	31
13.5	15	12.5	48	31.5
14	15.5	13	48.5	32
14.5	16	13.5	49	32.5
15	16.5	14	49.5	33
15.5	17	14.5	50	33.5
16	17.5	15	50.5	34
16.5	18	15.5	51	34.5
17	18.5	16	51.5	35
17.5	19	16.5	52	35.5
18	19.5	17	52.5	36
18.5	20	17.5	53	36.5
19	20.5	18	53.5	37
19.5	21	18.5	54	37.5
20	21.5	19	54.5	38
20.5	22	19.5	55	38.5
21	22.5	20	55.5	39
21.5	23	20.5	56	39.5
22	23.5	21	56.5	40

At Nike, men's US is 1.5 below women's US: women's 8 is men's 6.5.

From Nike's women's chart.

Women's US	Men's US	UK	EU	cm
3.5	2	1.5	33.5	21
4	2.5	1.5	34.5	21
4.5	3	2	35	21.5
5	3.5	2.5	35.5	22
5.5	4	3	36	22.5
6	4.5	3.5	36.5	23
6.5	5	4	37.5	23.5
7	5.5	4.5	38	24
7.5	6	5	38.5	24.5
8	6.5	5.5	39	25
8.5	7	6	40	25.5
9	7.5	6.5	40.5	26
9.5	8	7	41	26.5
10	8.5	7.5	42	27
10.5	9	8	42.5	27.5
11	9.5	8.5	43	28
11.5	10	9	44	28.5
12	10.5	9.5	44.5	29
12.5	11	10	45	29.5
13	11.5	10.5	45.5	30
13.5	12	11	46	30.5
14	12.5	11.5	47	31
14.5	13	12	47.5	31.5
15	13.5	12.5	48	32
15.5	14	13	48.5	32.5
16	14.5	13.5	49	33
16.5	15	14	50	33.5
17	15.5	14.5	50.5	34
17.5	16	15	51	34.5
18	16.5	15.5	51.5	35
18.5	17	16	52	35.5
19	17.5	16.5	52.5	36
19.5	18	17	53	36.5
20	18.5	17.5	53.5	37
20.5	19	18	54	37.5
21	19.5	18.5	54.5	38
21.5	20	19	55	38.5
22	20.5	19.5	55.5	39
22.5	21	20	56	39.5