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

Mondo Sizes
On running shoes use the Mondo sizing system, where each whole size is equivalent to exactly 1cm in length.  To ensure the best fit we recommend:

    ●   If you have owned On before buy the same again; their sizing has not changed.

    ●  Shop using Mondo or US sizes.

    ●  Follow our "How to Measure Your Mondo Size" advice and video lower down this page.   

US Sizes
On US sizes run true to size for a perfect fit right out of the box.  No need to go up or down a size.

UK Sizes
On UK women's sizes run true to size for a perfect fit right out of the box.  No need to go up or down a size. On UK men's sizes run half a size too small.  If you want a UK size 10, buy an On UK 10.5 instead = Mondo 29.  On have clearly made a mistake - there is no difference between men's and women's sizes in the UK.  The correct UK size conversions from Mondo are shown in the "Absolute" column.

EU Sizes
On have clearly made a mistake - there is no difference between men's and women's sizes in the EU.  The correct EU size conversions from Mondo are shown in the "Absolute" column.

On Our Website.....
On our website we use On sizes (even though they are not always correct) because these are what appear on the shoe boxes and the shoes themselves.

On Running Shoe Sizes

 Size Conversions by:
 OnAbsolute
MondoUS
Men
US
Wmn
UK
Men
UK
Wmn
EU
Men
EU
Wmn
UKEU
22 5 3 36335.3
22.5 5.5 3.5 36.53.536
23 6 4 37436.7
23.5 6.5 4.5 37.54.537.3
24 7 5 38538
24.5 7.5 5.5 38.55.538.7
25786.5 *64039639.3
25.57.58.57 *6.540.5406.540
26897.5 *74141740.7
26.58.59.58 *7.54241.57.541.3
279108.5 *842.542842
27.59.510.59 *8.54342.58.542.7
2810119.5 *94443943.3
28.510.5 10 * 44.5 9.544
2911 10.5 * 45 1044.7
29.511.5 11 * 46 10.545.3
3012 11.5 * 47 1146
30.512.5 12 * 47.5 11.546.7
3113 12.5 * 48 1247.3
31.513.5 13 * 49 12.548

 Source: On / Absolute

* UK men's run small 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