How do I convert Brooks shoe size to Altra?

Match by foot length in centimeters on each brand’s chart. Example: Brooks US 10 ≈ Altra US 10.0 (about 27.1 cm). Model fit can still differ — check model guides.

Is a Brooks 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.

Brooks 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 · Ghost 16 Check current prices · Lone Peak 8

(paid link)

Your Brooks size (US)

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

Brooks → Altra chart

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

Brooks US	cm	Altra US	Altra EU
6.0	23.5	6.0	38.5
6.5	24.0	6.5	39.0
7.0	24.5	7.0	40.0
7.5	25.0	7.5	40.5
8.0	25.4	8.0	41.0
8.5	25.9	8.5	42.0
9.0	26.2	9.0	42.5
9.5	26.7	9.5	43.0
10.0	27.1	10.0	44.0
10.5	27.5	10.5	44.5
11.0	27.9	11.0	45.0
11.5	28.4	11.5	45.5
12.0	28.8	12.0	46.0
13.0	29.7	13.0	47.5

Model fit matters

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

Brooks: Ghost 16 · Glycerin 21

Altra: Lone Peak 8

Check prices: Brooks Altra (paid link)

FAQ

How do I convert Brooks shoe size to Altra?: Match by foot length in centimeters on each brand’s chart. Example: Brooks US 10 ≈ Altra US 10.0 (about 27.1 cm). Then adjust for the specific model’s fit (runs big/small/narrow).
Is a Brooks 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.