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ASICS to New Balance shoe size

The short answer

ASICS 4.5 is New Balance 5 by the two brands' own charts. 11 of 18 ASICS sizes land on a different label at New Balance.

Both brands publish the foot length each size is built for, so every row matches a foot, not a label.

On 2 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every ASICS size read across to New Balance. US women's sizes on the left, US women's on the right.
ASICSASICS builds it forNew Balance, by chartSame labelNew Balance builds it forNew Balance also prints
4foot length 21.5 cmnot madenot publishednot publishednot published
4.5foot length 22 cm5not publishedfoot length 22 cmUS men's 3.5 · UK 3 · EU 35
5foot length 22.5 cm5.55foot length 22.5 cmUS men's 4 · UK 3.5 · EU 36
5.5foot length 22.8 cm5.5 or 65.5foot length 22.5 cmUS men's 4 · UK 3.5 · EU 36
6foot length 23 cm66foot length 23 cmUS men's 4.5 · UK 4 · EU 36.5
6.5foot length 23.5 cm6.56.5foot length 23.5 cmUS men's 5 · UK 4.5 · EU 37
7foot length 24 cm77foot length 24 cmUS men's 5.5 · UK 5 · EU 37.5
7.5foot length 24.5 cm7.57.5foot length 24.5 cmUS men's 6 · UK 5.5 · EU 38
8foot length 25 cm88foot length 25 cmUS men's 6.5 · UK 6 · EU 39
8.5foot length 25.5 cm8.58.5foot length 25.5 cmUS men's 7 · UK 6.5 · EU 40
9foot length 25.8 cm8.5 or 99foot length 25.5 cmUS men's 7 · UK 6.5 · EU 40
9.5foot length 26 cm99.5foot length 26 cmUS men's 7.5 · UK 7 · EU 40.5
10foot length 26.5 cm9.510foot length 26.5 cmUS men's 8 · UK 7.5 · EU 41
10.5foot length 27 cm1010.5foot length 27 cmUS men's 8.5 · UK 8 · EU 41.5
11foot length 27.5 cm10.511foot length 27.5 cmUS men's 9 · UK 8.5 · EU 42.5
11.5foot length 28 cm1111.5foot length 28 cmUS men's 9.5 · UK 9 · EU 43
12foot length 28.5 cm11.512foot length 28.5 cmUS men's 10 · UK 9.5 · EU 43.5
12.5foot length 28.8 cm11.5 or 1212.5foot length 28.5 cmUS men's 10 · UK 9.5 · EU 43.5
13foot length 29 cm1213foot length 29 cmUS men's 10.5 · UK 10 · EU 44
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the New Balance chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

New Balance to ASICS