whatsizetobuy

Adidas to On 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 · Samba OG Check current prices · Cloudmonster

(paid link)

Full converter (model + shoes you own) · Reverse: On → Adidas

Adidas → On chart

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

Adidas UScmOn USOn EU
6.023.56.038.5
6.524.06.539.0
7.024.57.040.0
7.525.07.540.5
8.025.48.041.0
8.525.98.542.0
9.026.29.042.5
9.526.79.543.0
10.027.110.044.0
10.527.510.544.5
11.027.911.045.0
11.528.411.545.5
12.028.812.046.0
13.029.713.047.5

How this Adidas → On chart actually maps

Adidas US 10 is 27.1 cm and the nearest On US is also 10 (EU 44). The table is 1:1 from US 6 (23.5 cm) to US 13 (29.7 cm). The wear-box “Adidas 10 ≈ On 10.0” is that centimeter match — not “Samba equals Cloud 5.” On prints EU 44 at US 10 here; Adidas does too on this page.

The lasts disagree. Samba OG is TTS length with a skinny T-toe; Gazelle often feels a half long for narrow/average feet; Ultraboost and Campus 00s are volume stories. On Cloud 5 is the snug everyday last (half-up is common; speed-lace). Cloudmonster is the roomier cushion trainer; Cloudsurfer sits with that family. Taking a Samba you already half-up for width, then adding another half because “Cloud 5 runs small,” stacks two unrelated offsets on a 1:1 chart.

Convert from the Adidas size that fits in length (usually TTS Samba, or 27.1 cm), then pick the On model. If Cloud 5 still feels short after that, the next half on this table is 27.1 → 27.5 cm (~4 mm). If the pinch is midfoot, Cloudmonster at the same US is the width/volume move, not a second length jump. Do not copy Gazelle’s half-down into Cloudmonster — that terrace length quirk is not an On rule.

Model fit matters

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

Adidas: Samba OG · Gazelle · Ultraboost 1.0 · Campus 00s

On: Cloudmonster · Cloud 5 · Cloudsurfer

Also compare Adidas to: Puma · Reebok · New Balance

Check prices: Adidas On (paid link)

FAQ

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