Buying shoes online can be tricky – especially when sizes vary from one country to another. A size 40 in Europe doesn’t necessarily match a UK 7 or a US 9. These differences can be confusing, but they stem from historical traditions, different measuring systems, and small variations in production. Here’s a guide to help you find the right shoe size and navigate the differences between international sizing systems.

Why shoe sizes aren’t the same everywhere

There’s no single global standard for shoe sizes. Instead, each region uses its own system:

• EU sizes (Continental European) are based on Paris points, where one point equals two-thirds of a centimetre.
• UK sizes (British) are measured in inches, starting from a “zero” that doesn’t correspond to 0 cm – hence the offset.
• US sizes (American) are similar to UK sizes but usually one size larger.
• Mondopoint (Asian and military system) measures the actual length of the foot in millimetres – the most precise system, though rarely used in everyday retail.

Because of these differences, an EU 42 won’t necessarily feel the same as a UK 8 or a US 9.5, even if they’re listed as equivalents.

How to measure your foot correctly

The best way to find your true size is to start with your foot’s actual length. All you need is a piece of paper, a pencil, and a ruler:

1. Stand on the paper with your heel against a wall.
2. Mark the tip of your longest toe.
3. Measure the distance from the wall to the mark in millimetres.
4. Repeat for both feet – they can differ slightly.
5. Use the longer measurement as your reference.

Once you know your foot length, compare it with the brand’s size chart. Many shoe companies have their own guides, and it’s always best to check them before ordering.

Small differences between brands and models

Even within the same country, sizes can vary. An EU 40 from an Italian brand might feel smaller than an EU 40 from a German one. This comes down to differences in the last (the mould the shoe is built around), materials, and design.

• Italian and French brands often have a narrower fit.
• German and Scandinavian brands tend to be slightly wider.
• Sports shoes may run larger to allow for movement and socks.
• Leather shoes can stretch a little with wear, while synthetic materials keep their shape.

It’s a good idea to read reviews or try on shoes from the same brand if you already own a pair.

Conversion charts – helpful but not perfect

Most online stores show conversion charts between EU, UK, and US sizes. They’re useful as a starting point, but remember they’re only approximate. A typical comparison might look like this:

• EU 38 ≈ UK 5 ≈ US 7.5 (women)
• EU 42 ≈ UK 8 ≈ US 9 (men)

Even a 2–3 millimetre difference can be noticeable, especially in snug-fitting shoes. Always combine the chart with your foot measurement and the brand’s own information.

What about children’s shoes?

Children’s feet grow quickly, so accuracy is especially important. Always start with the foot length in millimetres and add 10–15 mm for growth and movement. Many shoe stores offer measuring tools that show both foot length and recommended sizes across different systems.

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Tips for buying shoes online in New Zealand

• Check the return policy – particularly if you’re ordering from overseas.
• Read customer reviews – they often reveal whether a shoe runs true to size, small, or large.
• Try shoes on later in the day – feet tend to swell slightly, giving a more realistic fit.
• Use the right socks – test shoes with the type of socks you’ll normally wear with them.
• Be aware of regional differences – New Zealand retailers often list both UK and EU sizes, so double-check which system is being used.

A step towards the perfect fit

Finding the right shoe size isn’t just about numbers – it’s about comfort, movement, and wellbeing. Once you know your foot length and understand how different countries measure sizes, choosing the right pair becomes much easier. It saves you time, return shipping, and sore toes – and helps you step out in comfort and confidence.