Every conversion below is verified against the brand's official chart and backed by daily fittings in the shop. Pick your brand — each guide has full US, UK, EU and centimetre conversions, our honest fit advice, and how each brand sizes against your Asics number.
Running shoes
- Asics — the true-to-size baseline; roomy toebox, wide widths
- HOKA — runs about a half size short of Asics
- On — true to size, narrow-to-medium fit
- norda — size up: half in the 001 and 005, a full size in the 002 and 003
- New Balance — true to size with the widest width range in the store
- Saucony — true to size; Endorphin race shoes taper up front
- Adidas — race lines run long and narrow
- Mizuno — true to size; wide feet go half up in the racier models
- Altra — keep your usual size; the FootShape toebox adds width, not length
- Nike — true to size on a narrower last
- Hettas — women-specific last; runs about a half size short
Run apparel and outdoor
- Tracksmith — true to size, no vanity sizing; Brighton base layers run small
- Satisfy — numeric 0–4 sizing; between sizes take the larger
- Bandit Running — true to size; compression pieces run tight
- SOAR — tailored British race fit; North American buyers go one up in tops
- Peak Performance — true to size, European athletic cut
- Arc'teryx — true to size; size up one in Beta LT or SV for heavy layering
- Houdini — slim Scandinavian fit; sleeves run long by design
- Lululemon — Swiftly runs small; Align and Wunder Train fit true
- Snow Peak — Japanese sizing; most Western buyers go up one
How shoe brands compare
Our anchor is your Asics size — the most true-to-size fit in running. On, Adidas, Saucony, Mizuno, New Balance and Altra carry the same number over; HOKA and Hettas run about a half size short; norda asks for a half to full size up depending on the model. Every brand page above has the full conversion, and every product page on enroute.run carries the same charts in its size-guide button.