Unisex Trainer Sizing in the UK: Men’s, Women’s, US and EU Explained

“Unisex” tells you who a trainer is sold for; it does not give you a universal conversion rule. Before choosing a size, check whether that particular product uses a men’s/unisex chart, a women’s-based chart or its own brand mapping. This matters most when US sizes are shown, but UK and EU conversions can differ between brands too.

That is why shortcuts such as “add one size” or “subtract one and a half” cause so much trouble. A rule may describe one column in one brand’s chart and still be wrong for the next pair you open.

What does unisex sizing mean?

A unisex trainer is designed or marketed for more than one gender. The word does not tell you which sizing scale appears first on the label. Many brands base unisex footwear on their men’s chart; some products use a women’s-based chart instead.

Length and width are separate questions. ASICS’ size and width guidance, for example, uses B for its standard women’s width and D for its standard men’s width. That can make a men’s-width option useful for some women who need more room, but a men’s-based size chart does not prove that every unisex model has a wider forefoot or heel. Check the width code and the notes for the exact trainer rather than inferring its shape from the word “unisex”.

The distinction is not academic. If a product page simply shows “US 8” without saying whether that is US men’s or US women’s, the number is incomplete. In UK shopping, the product’s UK selector is usually the cleanest starting point, but you should still read the chart attached to that exact model rather than assume another brand converts it in the same way.

Why men’s-to-women’s conversion shortcuts go wrong

The familiar one-and-a-half-size difference belongs mainly to US men’s and women’s labels; it is not a universal instruction for converting a UK size. Nike’s current women’s-based unisex chart makes the distinction easy to see: US Women’s 8.5 and US Men’s 7 appear on the same row, while the UK size on that row is 6. The 1.5 difference sits between the two US columns.

Other brands may present the UK relationship differently. Saucony’s current UK chart for the ProGrid Omni 9 TMY says its unisex sizing runs as men’s sizing and tells women to select half a size below their normal women’s size. In that chart, unisex UK 7 sits alongside men’s UK 7 and women’s UK 7.5.

So, is a UK men’s size always the same as a UK women’s size? No safe answer applies to every brand and every product. Sometimes the same UK number is shared; sometimes the brand provides a separate adjustment. Read the heading above the chart before reading the numbers inside it.

How ASICS and Saucony label a UK 8

The examples below were checked on the manufacturers’ UK pages on 4 September 2026. They demonstrate the method; they are not a replacement for checking the current page when you order.

The ASICS and Saucony examples should not be blended into a new “YIO conversion formula”. Each remains a statement about the chart supplied for that brand and product at the time it was checked.

What is the safest way to convert UK, US and EU trainer sizes?

1. Start on the exact product page. Check whether it says men’s, women’s, unisex men’s-based or unisex women’s-based.
2. Measure both feet while standing. Use the longer measurement as your starting reference.
3. Open that brand’s current chart. Do not begin with the size of a different trainer you happen to own.
4. Find the foot-length guidance, then read across the same row. That keeps the UK, US and EU labels tied to one brand’s system.
5. Check the fit when the pair arrives. Conversion identifies a likely size; it cannot predict heel shape, forefoot width or room over the instep.

Be careful with centimetres as well. Nike explicitly says the CM/JP size printed on its boxes and labels differs from its “Foot Length (cm)” value. If you measure your foot in centimetres, match it to a row clearly described as Foot Length or Heel-to-Toe; do not assume every CM/JP box label means the same thing. Read each brand’s chart on its own terms.

Is EU sizing more reliable than UK or US sizing?

EU sizing avoids the separate US men’s and women’s numbers, which can make it look simpler. It is still not perfectly interchangeable between brands. Two companies can attach different EU values to the same UK size, and half-size steps are not presented consistently.

The live YIODesigner Sneaker Size & Fit Guide shows this with brand examples rather than pretending one conversion covers every trainer. Use it to understand the labels, then give priority to the manufacturer chart and sizing information shown for the pair you are considering.

What if your foot length falls between two sizes?

If your measured foot length falls between two sizes, the larger size is generally the safer starting point when the product page gives no different advice. A trainer that is physically too short cannot be corrected with lacing, and your longest toe should not be striking the front.

This is a rule for borderline length, not a fix for every tight shoe. If the smaller size is too short but the larger one slips noticeably at the heel, the model’s shape or internal volume may be the problem. Likewise, if the pressure is only across the sides of the forefoot, look for a roomier width or silhouette before adding unnecessary length.

What a conversion chart cannot tell you

A chart deals mainly with length and labels. It cannot tell whether a model has a narrow toe box, a broad heel, thick padding or limited space above the foot. Two trainers can be intended for a similar foot length and still feel completely different once they are laced.

When the pair arrives, check that your longest toe is clear of the front, your heel is controlled and the sides are not pinching. If one size is short but the next slips badly at the heel, the model’s shape may be the problem—not the conversion.

Before choosing a unisex pair at YIODesigner

Begin with the UK size selector and any fit information on the individual product page. Use the size and fit guide when you need to compare UK, US and EU labels, then check the manufacturer’s current chart for the final brand-specific mapping.

You can compare available unisex models in the full trainers and sneakers collection. The current trainers under £100 collection also includes ASICS and Saucony styles when stock is available.

Keep labels, packaging and soles in their original condition while checking the fit indoors, and read the YIODesigner returns policy before wearing a new pair outside.