1Y (GS) in men’s and women’s sizes
A 1Y (grade school) is a men’s US 1 and a women’s US 2.5 by the standard size tables: Y sizes use men’s numbers.
EU 31–31.5, for a foot of 19.0 to 19.5 cm.
How 2 brands map 1Y
| Brand · their big-kid size | On their adult chart | Foot, 1Y | Matched by |
|---|---|---|---|
| Jordan size chart (opens the brand’s site)US 1Y | M US 1 · W US 2.5 | 20.1 cm | printed beside its US 1Y |
| Nike size chart (opens the brand’s site)US 1Y | M US 1 · W US 2.5 | 20.1 cm | printed beside its US 1Y |
From each brand’s own charts, linked: the other side’s size where the chart prints it beside this one, or both sizes on one row; otherwise the row on the other chart with the same EU (or UK) size; otherwise the nearest foot length, within 3 mm. “Foot” is the brand’s own foot length for 1Y, where its chart gives one, not for the size it maps to. Highlighted rows differ from the standard tables. Not affiliated with any brand.
Who wears 1Y?
The median child’s foot reaches this size at about 7½ years, in the US Consumer Product Safety Commission’s survey of children.
The foot each brand’s own chart makes 1Y for runs from 19.0 cm (Vans) to 20.5 cm (Golden Goose) across 6 charts; the standard size tables make it for a foot up to 19.5 cm. Pick the brand whose foot length is at or just above yours.
Shops label 1Y differently: Foot Locker calls it PS (preschool) and ASICS GS (grade school), so search both labels.
Convert another size
1Y in every system
| System | Size |
|---|---|
| Foot length (cm) | 19.0–19.5 |
| US men’s | 1 |
| US women’s | 2.5 |
| UK | — |
| EU | 31–31.5 |
| Mondopoint (mm) | 195 |
| Japan (cm) | 19.5 |
From the standard size tables; where the foot range spans two sizes, both are shown.
Size tables checked 2026-10-23; brand sizes from each brand’s own charts, linked above. An estimate to help you choose: fit varies by brand and model. Not medical advice.