Converse to Altra shoe size

The short answer

Converse 3 is Altra 5.5 by the two brands' own charts.

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

Every Converse Chuck Taylor size read across to Altra. US men's sizes on the left, US women's on the right.
Converse Chuck Taylor	Converse builds it for	Altra, by chart	Same label	Altra builds it for	Altra also prints
3	foot length 22 cm	5.5	5	foot length 22 cm	UK 3.5 · EU 36
3.5	foot length 22.5 cm	6	5.5	foot length 22.5 cm	UK 4 · EU 37
4	foot length 23 cm	6.5	6	foot length 23 cm	UK 4.5 · EU 37.5
4.5	foot length 23.5 cm	7	6.5	foot length 23.5 cm	UK 5 · EU 38
5	foot length 24 cm	7.5	7	foot length 24 cm	UK 5.5 · EU 38.5
5.5	foot length 24.5 cm	8	7.5	foot length 24.5 cm	UK 6 · EU 39
6	foot length 24.5 cm	8	8	foot length 24.5 cm	UK 6 · EU 39
6.5	foot length 25 cm	8.5	8.5	foot length 25 cm	UK 6.5 · EU 40
7	foot length 25.5 cm	9	9	foot length 25.5 cm	UK 7 · EU 40.5
7.5	foot length 26 cm	9.5	9.5	foot length 26 cm	UK 7.5 · EU 41
8	foot length 26.5 cm	10	10	foot length 26.5 cm	UK 8 · EU 42
8.5	foot length 27 cm	10.5	10.5	foot length 27 cm	UK 8.5 · EU 42.5
9	foot length 27.5 cm	11	11	foot length 27.5 cm	UK 9 · EU 43
9.5	foot length 28 cm	11.5	11.5	foot length 28 cm	UK 9.5 · EU 44
10	foot length 28.5 cm	12	12	foot length 28.5 cm	UK 10 · EU 44.5
10.5	foot length 29 cm	12 or 13	not published	foot length 28.5 cm	UK 10 · EU 44.5
11	foot length 29.5 cm	13	13	foot length 29.5 cm	UK 11 · EU 46
11.5	foot length 30 cm	13	not published	foot length 29.5 cm	UK 11 · EU 46
12	foot length 30.5 cm	not made	not published	not published	not published
13	foot length 31.5 cm	not made	not published	not published	not published
14	foot length 32 cm	not made	not published	not published	not published
15	foot length 33 cm	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Altra 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

Converse Chuck Taylor size guide, read on 2026-09-18. Converse on TrueToSize
Altra size guide, read on 2026-09-17. Altra on TrueToSize

Altra to Converse