Understanding SHoe Sizes: UK, EU and Finding the Perfect Fit

Finding the right fit can be frustrating, especially when sizinf varies between brands and countires. In this guide, we'll explain how shoe sizing works, compare UK and EU sizing systems, and show you how to measure your feet accurately at home.

Quick Answer

To find your correct shoe size, measure both feet in millimetres and use the larger measurement when comparing against a sizing chart. Because shoe lasts and sizing systems vary between brands, your size may differ slightly between styles and manufacturers.

Why Shoe Sizes Vary

We all have unique feet—different shapes, widths, and proportions. At AG Meek, we recognise this individuality, but it does present a challenge: there's no universal shoe sizing standard. From ancient barleycorns to modern Paris points, sizing systems vary across regions. Understanding how they work helps you choose footwear with confidence.

Even if two pairs of shoes are labelled as the same size, they may fit differently depending on how they have been designed and manufactured. Understanding the factors that influence fit can help you choose footwear with greater confidence.

Understanding SHoe Lasts and Sole Units

Every shoe is built on a last—a mould that determines the shoe's shape, style and internal volume. The same size in different lasts can feel completely different on your feet. A last that suits one person perfectly may feel too narrow or too roomy for another.

This is why you may find that a size 6 in one brand feels perfect, while a size 6 in another feels too tight or too loose. The size number may be the same, but the last used to create the shoe can be very different.

Another important factor affecting fit is the shape of the sole unit. Many modern shoes use moulded sole units, which can vary significantly between brands and styles. These variations can affect how a shoe feels underfoot and how it fits around the foot.

The best footwear brands work hard to maintain consistent sizing standards. While this can increase manufacturing costs, it helps ensure a reliable fit year after year, giving customers confidence when purchasing the same brand again.

Your Shoe Size Can Change

Many people assume their shoe size remains the same throughout their lives, but this is not always the case.

Weight gain or loss can affect foot width and volume, while ageing causes the ligaments in the feet to relax, often resulting in feet becoming longer and wider over time. Pregnancy can also cause permanent changes to foot size and shape.

For this reason, it is worth measuring your feet periodically rather than assuming your shoe size will always remain the same.

UK and EU Sizing Systems Explained

The UK sizing system traces back to the 13th century, when King Edward II standardised measurement using the barleycorn—a unit equal to 1/3 inch (8.46mm). Each UK shoe size increases by one barleycorn in length, working backwards from a UK 13, which was orginally based on a 12-inch foot length.

The EU system uses Paris points, where each size increases by 6.67mm (two-thirds of a centimetre). This system is widely used throughout Europe and forms the basis for many shoes sold in the UK today.

Because barleycorns and Paris points are different lengths, UK and EU sizes do not align perfectly. For example, a UK size 4 is not equivalent to an EU size 37. To help manufacturers and consumers, the International Organisation for Standardisation (ISO) has developed conversion standards that make size comparisions more consistent.

How to Measure Your Feet at Home

Accurate measurement is the foundation of finding your correct size. You'll need just two things: a tape measure and a heavy book. Follow these simple steps:

Step 1. Remove your shoes and socks, then position your heel against a wall.

Step 2. Place the heavy book parallel to the wall and slide it gently up to your longest toe (ask someone to help if needed).

Step 3. Step away carefully without moving the book or wall.

Step 4. Use your tape measure to find the distance in millimetres between the wall and the book.

Step 5. Repeat for your other foot—they're rarely the same size.

Most people have one foot slightly larger than the other, so always use the measurement from your larger foot when selecting your shoe size. For example, if one foor measures as a size 6 and the other as a size 7, you should generally choose the size 7 for comfort.

Please note that US sizes and UK sizes are different. Us women's sizes are typically around two sizes larger than their UK equivalent, while US men's sizes are generally around half a size larger than UK sizing.

UK And EU Size Comparison Chart