Question

How shoe Size conversion is done ?

Answer 1

The adult shoe sizes are calculated from typical last length, which is converted from foot length in mm by adding an allowance of two shoe sizes:

 

European shoe size conversion

EUR	Mondo	UK	US men	US women
34	215	2	3	4
34.5	215	2.5	3.5	4.5
35	220	3	4	5
35.5	225	3.5	4.5	5.5
36	225	4	5	6
36.5	230	4	5	6
37	235	4.5	5.5	6.5
37.5	235	5	6	7
38	240	5.5	6.5	7.5
38.5	245	5.5	6.5	7.5
39	245	6	7	8
39.5	250	6.5	7.5	8.5
40	255	7	8	9
40.5	255	7.5	8.5	9.5
41	260	7.5	8.5	9.5
41.5	265	8	9	10
42	265	8.5	9.5	10.5
42.5	270	9	10	11
43	275	9.5	10.5	11.5
43.5	275	9.5	10.5	11.5
44	280	10	11	12
44.5	285	10.5	11.5	12.5
45	285	11	12	13
45.5	290	11.5	12.5	13.5
46	295	11.5	12.5	13.5
46.5	295	12	13	14
47	300	12.5	13.5	14.5
47.5	305	13	14	15
48	305	13	14	15
48.5	310	13.5	14.5	15.5
49	315	14	15	16
49.5	315	14.5	15.5	16.5
50	320	15	16	17

SOURCE          https://en.wikipedia.org/wiki/Shoe_size 

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Answer 2

The standard also includes quick conversion tables for adult shoe sizes; they provide matching sizes for shoes marked in Mondopoint, UK and US systems. Converted values are rounded to a larger shoe size to increase comfort.

                            

Mondopoint conversion

Mondo	EUR	UK	US men	US women
215	34	2.5	3.5	4.5
220	35	3	4	5
225	35.5	3.5	4.5	5.5
230	36.5	4	5	6
235	37	4.5	5.5	6.5
240	38	5.5	6.5	7.5
245	38.5	6	7	8
250	39.5	6.5	7.5	8.5
255	40	7	8	9
260	41	7.5	8.5	9.5
265	41.5	8.5	9.5	10.5
270	42.5	9	10	11
275	43	9.5	10.5	11.5
280	44	10	11	12
285	44.5	10.5	11.5	12.5
290	45.5	11	12	13
295	46	12	13	14
300	47	12.5	13.5	14.5
305	47.5	13	14	15
310	48.5	13.5	14.5	15.5
315	49	14	15	16
320	50	15	16	17

SOURCE             https://en.wikipedia.org/wiki/Shoe_size
 

 

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Answer 3

Shoe size in the United Kingdom, Ireland, India, Pakistan and South Africa is based on the length of the last used to make the shoes, measured in barleycorns (​1⁄3 inch) starting from the smallest size deemed practical, which is called size zero. It is not formally standardised. Note that the last is typically longer than the foot heel to toe length by about 1⁄2 to 2⁄3 inch (13 to 17 mm).

A child's size zero is equivalent to 4 inches (a hand = 12 barleycorns = 10.16 cm), and the sizes go up to size ​13 1⁄2 (measuring ​25 1⁄2 barleycorns, or 8 1⁄2 inches (21.59 cm)). Thus, the calculation for a children's shoe size in the UK is:

United Kingdom shoe size conversion

UK	Mondo	EUR	US men	US women
2	210	34	3	4
2.5	215	34.5	3.5	4.5
3	220	35	4	5
3.5	225	35.5	4.5	5.5
4	230	36.5	5	6
4.5	235	37	5.5	6.5
5	235	37.5	6	7
5.5	240	38	6.5	7.5
6	245	39	7	8
6.5	250	39.5	7.5	8.5
7	255	40	8	9
7.5	260	40.5	8.5	9.5
8	260	41.5	9	10
8.5	265	42	9.5	10.5
9	270	42.5	10	11
9.5	275	43.5	10.5	11.5
10	280	44	11	12
10.5	285	44.5	11.5	12.5
11	290	45.5	12	13
11.5	290	46	12.5	13.5
12	295	46.5	13	14
12.5	300	47	13.5	14.5
13	305	47.5	14	15
13.5	310	48.5	14.5	15.5
14	315	49	15	16
14.5	320	49.5	15.5	16.5
15	320	50	16	17

SOURCE       https://en.wikipedia.org/wiki/Shoe_size
 

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