Sneaker Size Conversion: US, UK, EU, and CM Explained

Why size conversion is tricky

Sneaker sizes are expressed in several different systems around the world. The US, UK, EU, and centimeter (or mondopoint) systems each measure the same foot but assign different numbers. Because these systems were developed independently, they do not map to each other in a simple, fixed way.

A size that fits in one brand may run differently in another, even within the same regional system. That is why a reliable size conversion is less about memorizing a chart and more about knowing your foot length in centimeters and comparing it with the brand's published measurements.

For general guidance on foot health and proper footwear, the American Academy of Orthopaedic Surgeons (AAOS) and its OrthoInfo patient education site provide expert-reviewed information. These resources emphasize the importance of a well-fitted shoe, but you must still rely on each sneaker brand's specific sizing.

The four systems explained

The US system uses inches and is commonly used in North America. The UK system also uses inches but with a different numbering offset. The EU system is based on the Paris point, a metric unit of length, and is widely used in Europe. The centimeter, or mondopoint, system directly states the length of the foot in centimeters and is often found on running and technical sneakers.

Because the EU and centimeter systems are metric, they tend to be more straightforward if you know your foot length. In contrast, the US and UK systems are based on traditional measurements that can vary between brands and even between models from the same manufacturer.

Why conversion charts are not universal

Many online size conversion charts claim to show the relationship between US, UK, EU, and cm. However, these charts are often generalized and may not reflect the actual sizing of a specific sneaker. Sneaker lasts (the forms shoes are built on) differ, and some brands intentionally size their shoes larger or smaller to suit a particular fit philosophy.

A size that fits you in one sneaker model may not fit you in another, even from the same brand. This is why it is essential to treat any conversion chart as a starting point, not a guarantee. Always check the brand's official size guide for the exact model you plan to purchase.

Measure your foot in centimeters

The most reliable way to determine your sneaker size is to measure the length of your foot in centimeters. Place a piece of paper on the floor against a wall. Stand on the paper with your heel touching the wall, and mark the longest point of your foot. Measure the distance from the edge of the paper to that mark with a ruler.

Repeat this for both feet, as one foot is often slightly larger. Use the larger measurement as your baseline. It is best to measure at the end of the day, when your feet have expanded slightly from standing and walking. You can find detailed steps in our guide on measuring foot size.

Use each brand's size chart

Once you have your foot length in centimeters, look up the brand's official size chart for the specific sneaker you want. Most reputable sneaker manufacturers publish a chart that converts cm to their US, UK, and EU sizes. These charts are the only accurate source for that brand's sizing.

If you are buying from a brand that does not provide a cm measurement, it is worth contacting their customer support or looking for a physical store where you can try the sneaker on. This is especially important when buying from best running sneakers or best men's sneakers.

Buying sneakers from another region

When you order sneakers from a brand based in another country, the size label may be in that region's system. This is where a cm measurement becomes invaluable. Even if you are used to a certain US size, the same numeric size from an EU brand may fit differently. Always convert using the brand's own chart, not a generic conversion table.

Many international brands now include cm on their labels or websites, making the conversion more straightforward. If you cannot find it, ask customer service for the foot length in centimeters that corresponds to the size you are considering.

Width and fit matter as much as length

Length is only one part of the fit. The width of your foot also plays a critical role in comfort. Some brands offer wide or narrow versions, and many sneaker models have different volume and toe-box shapes. Converting your length without considering width can lead to a snug or pinched fit.

Our guide on shoe width explains how to assess your width and what to look for. For sneakers with a narrow build, you might need to size differently. Similarly, if you have wide feet, you should look for models labeled as wide fit, as we outline in our best wide sneakers guide.

What to pick for your use

Questions

Are US and UK sneaker sizes the same?

No. US and UK systems are different. The relationship is not fixed and varies by brand. Always refer to the brand's conversion chart.

What is the most accurate way to convert sneaker sizes?

The most accurate method is to measure your foot length in centimeters and use the brand's official size chart for the specific model. This avoids the inaccuracies of generalized conversion charts.

Does a EU size 42 always equal a US 9?

No. EU sizing is based on the Paris point, and while there are common correspondences, the exact conversion can differ between brands and even between sneaker models. A cm measurement is more reliable.

Should I size up or down for sneakers?

It depends on the brand's fit and the purpose of the sneaker. For athletic shoes, you may need extra room in the toe box. Always refer to the brand's sizing guidance and your foot measurement in cm.

Can my foot size change over time?

Yes. Feet can change shape and size due to age, weight, and activity. It is wise to remeasure your feet periodically, especially before buying new sneakers.