Reebok to Birkenstock shoe size

The short answer

Reebok 3.5 is Birkenstock 35 by the two brands' own charts.

At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.

Every Reebok size read across to Birkenstock. US women's sizes on the left, EU on the right.
Reebok	Birkenstock, by chart	Same label	Birkenstock also prints
3.5	35	not published	not published
4	35	not published	not published
4.5	35	not published	not published
5	36	not published	not published
5.5	36	not published	not published
6	37	not published	not published
6.5	37	not published	not published
7	38	not published	not published
7.5	38	not published	not published
8	39	not published	not published
8.5	39	not published	not published
9	40	not published	not published
9.5	40	not published	not published
10	41	not published	not published
10.5	41	not published	not published
11	42	not published	not published
11.5	42	not published	not published
12	43	not published	not published
12.5	43	not published	not published
13	44	not published	not published
13.5	44	not published	not published
14	44 or 48	not published	not published

Neither chart publishes the body each size is built for, so the rows line up the labels. 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.

Open in the converter Add an item you own

Sources

Reebok size guide, read on 2026-09-18. Reebok on TrueToSize
Birkenstock size guide, read on 2026-09-18.

Birkenstock to Reebok