Allbirds Size Chart

Allbirds's charts give these lengths — CM: size in cm. A measured foot length and a size in cm are about 8 mm apart for the same size, so compare your own foot length only with a column on the same scale.

Only in part. The chart gives the length each size is meant for; how a particular model fits also depends on its last, width and materials, which the chart does not show. Allbirds itself advises: The Tree Runner tends to run small; Allbirds recommends sizing up from your usual size. Allbirds Germany says most customers take their normal size; with wider feet or for more toe room, go half a size up, or a whole size for even more room. Allbirds Germany (women's): if you have wide feet or are between two sizes, take one size larger.

When the two charts list different lengths. A measured foot length and a size in cm are about 8 mm apart, and the length of a foot is not the inside length of a shoe, so such a match can be half a size or more off. The converter matches only lengths on the same scale and lists the other brands separately. Allbirds's chart does not say whether its lengths are foot or shoe lengths, so treat any match with another brand as approximate.

On 2026-10-24, against Allbirds's official size guide linked under each chart. The date changes only when the chart is checked again against the official page or its numbers change, not when this page's layout or wording changes.