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New Balance to Altra shoe size

The short answer

New Balance 5 is Altra 5.5 by the two brands' own charts. 15 of 17 New Balance sizes land on a different label at Altra.

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

Every New Balance size read across to Altra. US women's sizes on the left, US women's on the right.
New BalanceNew Balance builds it forAltra, by chartSame labelAltra builds it forAltra also prints
5foot length 22 cm5.55foot length 22 cmUK 3.5 · EU 36
5.5foot length 22.5 cm65.5foot length 22.5 cmUK 4 · EU 37
6foot length 23 cm6.56foot length 23 cmUK 4.5 · EU 37.5
6.5foot length 23.5 cm76.5foot length 23.5 cmUK 5 · EU 38
7foot length 24 cm7.57foot length 24 cmUK 5.5 · EU 38.5
7.5foot length 24.5 cm87.5foot length 24.5 cmUK 6 · EU 39
8foot length 25 cm8.58foot length 25 cmUK 6.5 · EU 40
8.5foot length 25.5 cm98.5foot length 25.5 cmUK 7 · EU 40.5
9foot length 26 cm9.59foot length 26 cmUK 7.5 · EU 41
9.5foot length 26.5 cm109.5foot length 26.5 cmUK 8 · EU 42
10foot length 27 cm10.510foot length 27 cmUK 8.5 · EU 42.5
10.5foot length 27.5 cm1110.5foot length 27.5 cmUK 9 · EU 43
11foot length 28 cm11.511foot length 28 cmUK 9.5 · EU 44
11.5foot length 28.5 cm1211.5foot length 28.5 cmUK 10 · EU 44.5
12foot length 29 cm12 or 1312foot length 28.5 cmUK 10 · EU 44.5
12.5foot length 29.5 cm13not publishedfoot length 29.5 cmUK 11 · EU 46
13foot length 30 cm1313foot length 29.5 cmUK 11 · EU 46
Tinted rows change label or sit between two sizes. 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

Altra to New Balance