On Shoe Size Chart: US, UK, EU & Foot Length Guide (Men, Women & Kids)

On Men’s Shoe Size Chart (US, UK, EU, JP)

This is On’s men’s chart, converted across the sizing systems On lists. JP and MX sizes are the same number in centimeters. The last column is an approximate foot length: it is the JP size minus 1 cm, following On’s measuring rule. Brazil shows N/A where On does not list a size.

Source: On size chart for men, US 7 to 15. Approx. foot length = JP size minus 1 cm (On’s rule).

On Women’s Shoe Size Chart (US, UK, EU, JP)

On’s women’s range is sized 1.5 above the men’s equivalent, so a men’s 7 and a women’s 8.5 are the same pair. The women’s JP column is therefore half a size different from the men’s column for the same US number. Always read the women’s table when you shop women’s models.

Source: On size chart for women, US 5 to 12. Approx. foot length = JP size minus 1 cm (On’s rule).

On Kids’ Shoe Size Chart (Cloud Play)

On’s kids’ chart covers the Cloud Play shoe. For kids, the centimeter and inch columns are the foot length that matches each size, so you can measure your child’s foot and read across. Kids’ sizes switch to 1, 1.5, 2 and so on after US 13.5, which is the normal US youth reset.

Source: On kids’ size chart for Cloud Play. Measure your child’s foot standing, and check again every few months.

Do On Shoes Run True to Size?

Yes, going by On’s own ratings. On shows a size and fit rating on each product page, and every model we checked says True to size. That includes road runners like the Cloudmonster 3, Cloudsurfer 2 and Cloudrunner 3, everyday shoes like the Cloud 6 and Cloudtilt, the waterproof Cloudrock Low WP, the trail Cloudsurfer Trail 2 and the kids’ Cloud Play. On’s FAQ adds that men’s shoes are designed wider than women’s, so the width feel changes with the gender you pick, even at the same length.

Ratings are On’s, read from product pages on October 30, 2026. They can change when a model is updated, so check the page for the exact pair.

Men’s vs Women’s On Sizes: How to Convert

On’s rule is simple: women’s sizes are 1.5 larger than men’s. A men’s 7 is a women’s 8.5, a men’s 9 is a women’s 10.5, and a men’s 8 is a women’s 9.5. EU and UK numbers stay the same for the same shoe (men’s 9 and women’s 10.5 are both UK 8.5 and EU 42.5). If you want a deeper look at the maths, see our men’s to women’s shoe size conversion chart.

Buying across genders can also change the fit. Because On designs men’s shoes wider, a woman moving to a men’s pair will usually get more width, and a man moving to a women’s pair will get a slimmer shape.

On Wide Fit Options

On makes wide versions of some popular models. On’s product pages list wide variants of the Cloudmonster 3, Cloudrunner 3 and Cloud 6, each rated true to size. On’s FAQ says wide sizes exist on certain models only, and that you can use the “Wide Fit” filter on the site. It also notes that this filter is not available in every country. Wide versions use the same size numbers as the regular model, so you pick your normal size and change the width. For general guidance on width letters, read our shoe width guide.

Running Shoes vs Everyday On Shoes

On suggests choosing running shoes at least half a size bigger than your street shoes, so your toes have room in the toe box as your feet swell and push forward when you run. Everyday models like the Cloud 6 or Cloudtilt do not need that extra room if you only walk in them. If you wear orthotics, On says to look for a wider base or go up half a size.

• Running: at least half a size up from your street shoe size, with room at the toe box.
• Everyday and lifestyle: your normal size, as the models we checked are rated true to size.
• With orthotics: a wider base, or half a size up.

How to Measure Your Foot for On Shoes

On’s method is built around your bare foot. Stand with your heel against a wall, mark or measure to your longest toe, and then add about 1 cm. That number is your approximate JP size in centimeters, which you can read across to US, UK and EU in the tables above. Measure both feet and use the longer one, ideally late in the day when feet are at their largest. We have a full walkthrough in how to measure foot size at home.

Between Sizes? What to Do

If your measurement lands between two On sizes, think about how you will use the shoe. For running, take the larger size. For all day wear, the true to size rating suggests your usual size is fine, but go up if you wear thick socks or have a wider foot and no wide version is available. Remember that On does not list a Brazilian size in every half size, so those rows show N/A.

On vs Other Brands: Size Comparison

If you already own a pair from another brand, start from the converter above and compare with that brand’s own chart. We keep matching guides for HOKA, Brooks, New Balance and Nike. Do not copy a size across brands without checking the chart, because every brand builds its last differently.

Frequently Asked Questions About On Shoe Sizes

Final Takeaway

On keeps its sizing simple: women’s is men’s plus 1.5, JP is your foot length in centimeters, and the models we checked are all rated true to size. Pick your table, use the converter, and add half a size if the pair is for running.

More Shoe Size Guides

Sources

• On FAQ: sizing and stock
• On product pages (size and fit panels)