Birkenstock to PUMA shoe size

The short answer

Birkenstock 39 is PUMA 8 or 8.5 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 Birkenstock size read across to PUMA. EU sizes on the left, US women's on the right.
Birkenstock	PUMA, by chart	Same label	PUMA also prints
35	not made	not published	not published
36	5.5	not published	UK 3 · EU 35.5
37	6 or 6.5	not published	UK 3.5 · EU 36
38	7 or 7.5	not published	UK 4.5 · EU 37.5
39	8 or 8.5	not published	UK 5.5 · EU 38.5
40	9 or 9.5	not published	UK 6.5 · EU 40
41	10 or 10.5	not published	UK 7.5 · EU 41
42	11	not published	UK 8.5 · EU 42.5
43	not made	not published	not published
44	not made	not published	not published
48	not made	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. 4 sizes have no counterpart on the PUMA 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

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

PUMA to Birkenstock