On Running Shoes / Footwear Size Chart, UK, EU, USA, Mondo

On Running Shoe sizes are correct if you refer to Mondo, US or UK Women's sizing. Their 'translation' to UK men's and to EU sizes is different to most other brands and is not correct because in the EU and the UK there is no difference between men's and women's sizes but, according to the data in the On shoe size table below, there is!  We therefore recommend:

    ●  If you have owned On running shoes before, simply order the same size again.

    ●  Use Mondo or US sizing.

    ●  If using UK men's sizing, choose a half size bigger than your normal shoe size.

         If your normal shoe size is UK 10, buy an On UK 10.5 =Mondo 29.0

    ●  Ignore On's EU sizing. 

         If you prefer to use EU sizing we have added an "EU Absolute" column showing the correct conversion from Mondopoint.  EU shoe sizes increase in 3.333mm increments - which is why, when presented to a single decimal point, they should always end with .0, .3 or .7 and never with .5.  

On Running Shoe Sizes

22.0 3 5 3635.3
22.5 3.5 5.5 36.536
23.0 4 6 3736.7
23.5 4.5 6.5 37.537.3
24.0 5 7 3838
24.5 5.5 7.5 38.538.7
25.06.5 *678403939.3
25.57 *
26.07.5 *789414140.7
26.58 *
27.08.5 *891042.54242
27.59 *8.59.510.54342.542.7
28.09.5 *91011444343.3
28.510 * 10.5 44.5 44
29.010.5 * 11 45 44.7
29.511 * 11.5 46 45.3
30.011.5 * 12 47 46
30.512 * 12.5 47.5 46.7
31.012.5 * 13 48 47.3
31.513 * 13.5 49 48

 Source: On / Absolute-Snow

* UK men's overstated by a half size.  If you need a UK 10, buy a UK 10.5 = Mondo 29

Absolute Confidence

We are experts on shoe sizing and are confident in the information we have provided because we:

Tick  Have been selling shoes in our Sports Shop for years.

Tick  Carefully research sizes for every brand we sell.

Tick  Are very proud of our extremely low returns rate.

Tick  Have been selling footwear online since 2004.

Tick  We have been selling footwear online since 2004.

How to Measure Your Mondo Size

The Mondopoint size of a shoe is the length of the shoe's insole measured in cm. To work out your size, the best way is to look it up on a pair shoes which fit you well or to measure the length of the insole on your best fitting pair of shoes. Remove the insole and measure, using a steal measuring tape, from the extreme tip of the toe to the extreme tip of the heel. The measurement will ALWAYS be exact to the nearest 0.5cm. You will never get 30.2 or 28.8; it will always be 30.0 exactly. This is your mondo shoe or boot size. Checkout this video to have Adam explain it all in plain English.  He is using a snowboard boot but the same principle applies to all footwear.

Still not sure what size to get?

Buy a few pairs to try at home. We offer:

Tick  FREE Delivery on most orders to most destinations.

Tick  Low Cost Returns within the UK.

Additional Help & Advice

Tick  Browse our Advice Centre for more buying guides.

Tick  Email any time.

Tick  Phone during normal Shop Hours

Tick  Visit our Mountain Sports ShopAddress