How do I convert Asics shoe size to Altra?

Match by foot length in centimeters on each brand’s chart. Example: Asics US 10 ≈ Altra US 9.5 (about 27.0 cm). Model fit can still differ — check model guides.

Is a Asics US 10 the same as a Altra US 10?

Not always. Labels can map to slightly different foot lengths. Use the cm column, then adjust for the specific model’s fit.

Asics to Altra size conversion

Match sizes by foot length (cm), then check model fit — US labels alone can mislead across brands.

Chart match · verify brand charts

Check current prices · Gel-Kayano 31 Check current prices · Lone Peak 8

(paid link)

Your Asics size (US)

Full converter (model + shoes you own) · Reverse: Altra → Asics

Asics → Altra chart

Static conversion table (crawlable). Interactive tool above uses the same cm matching.

Asics US	cm	Altra US	Altra EU
6.0	23.4	6.0	38.5
6.5	23.9	6.5	39.0
7.0	24.4	7.0	40.0
7.5	24.9	7.5	40.5
8.0	25.3	8.0	41.0
8.5	25.8	8.5	42.0
9.0	26.1	9.0	42.5
9.5	26.6	9.5	43.0
10.0	27.0	9.5	43.0
10.5	27.4	10.0	44.0
11.0	27.8	11.0	45.0
11.5	28.3	11.5	45.5
12.0	28.7	12.0	46.0
13.0	29.6	13.0	47.5

Model fit matters

Even when charts match, lasts differ. Check these guides:

Asics: Gel-Kayano 31 · Gel-1130

Altra: Lone Peak 8

Also compare Asics to: Brooks

Check prices: Asics Altra (paid link)

FAQ

How do I convert Asics shoe size to Altra?: Match by foot length in centimeters on each brand’s chart. Example: Asics US 10 ≈ Altra US 9.5 (about 27.0 cm). Then adjust for the specific model’s fit (runs big/small/narrow).
Is a Asics US 10 the same as a Altra US 10?: Not always. Labels can map to slightly different foot lengths. Use the cm column, then check model guides on both brands.
Which direction should I read first?: Start from the brand you already wear, then open the model fit pages linked below — lasts differ even when charts match.

Clothes sizing uses a separate compare path.