Brooks vs ASICS Shoe Size Comparison
ASICS runs about 0.5 sizes larger than Brooks, so start by checking down from your usual size. The estimate uses a fit-offset difference of about 2mm plus each brand's fit evidence — not the size labels alone. Use the table below to convert any Brooks US size to a starting size in ASICS, with UK, EU and CM alongside.
Brooks → ASICS size chart
| Brooks US | ASICS US | ASICS range | ASICS UK | ASICS EU | ASICS CM |
|---|---|---|---|---|---|
| 7 | 7.5 | 6–8.5 | 6.5 | 37 | 25 |
| 8 | 8.5 | 7–9.5 | 7.5 | 38 | 25.5 |
| 9 | 9.5 | 8–10.5 | 8.5 | 40 | 26.5 |
| 10 | 10.5 | 9–11.5 | 9.5 | 41 | 27.5 |
| 11 | 11.5 | 10–12.5 | 10.5 | 42 | 28 |
| 12 | 12.5 | 11–13.5 | 11.5 | 43 | 29 |
| 13 | 13.5 | 12–14.5 | 12.5 | 45 | 30 |
Data confidence
Why Brooks and ASICS differ
Brooks runs ~0.5 size larger than ASICS.
That works out to roughly 2mm of real shoe length. We map every size through foot length in millimetres — the canonical axis — and then re-apply each brand's empirical fit offset, so the comparison reflects how the shoes actually fit rather than how they are labelled.
Brand-level estimate — per-model fit can vary by a full size or more within a brand. See how we calculate for how we measure fit offsets.