US vs UK vs EU Shoe Size Conversion

A US men’s size 9 equals a UK size 8 and an EU size 42-43. Swap systems, and the number on the box changes even though your foot stays the same.

This guide gives you the real conversion tables. It also covers the one method that beats them all: measuring your foot in centimeters.

US, UK, and EU Sizes Side by Side

Three systems, three different starting points. The US and UK scales count in half-sizes. The EU scale jumps in whole numbers based on a French unit called the Paris point.

US and UK sizes share roots. EU sizes stand apart.

Men’s Shoe Size Chart

Use foot length in centimeters as your anchor. Everything else follows from that.

All lengths above are measured heel to toe.

Women’s Shoe Size Chart

Women’s sizing runs on its own scale. It doesn’t match men’s sizing at the same number.

A men’s US 8 and a women’s US 8 are not the same foot.

A men’s US 8 measures 26.7 cm. A women’s US 8 measures 24.1 cm. That’s a 2.6 cm gap between two shoes wearing the same size label.

Why the Same Size Fits Differently Across Brands

Shoe size isn’t a fixed unit like a centimeter. It’s a label built around a last.

A last is the foot-shaped mold a brand builds its shoes on. Every brand’s last is slightly different.

Picture two shoes both labeled US size 9. One’s a running shoe, the other a dress shoe, each from a different maker. Their actual internal length can differ by half a size.

That’s why size charts vary brand to brand, even at the same stated number. Width compounds the problem. Two shoes marked the same length can still fit differently if one last is cut narrower through the midfoot.

The last shapes fit far more than the size label does.

Where EU Sizing Actually Comes From

EU sizes trace back to the Paris point. It’s an old French unit equal to 2/3 of a centimeter.

Here’s the formula: multiply a shoe’s internal length in centimeters by 1.5, then add a small toe allowance. Take a 25 cm foot. 25 x 1.5 = 37.5.

Add roughly 2.5 for allowance and you get 40. That matches the men’s US 7 row above.

This math explains why EU sizes climb in bigger steps than US half-sizes. It also explains why a precise foot measurement rarely lands on a clean EU number. Rounding to the nearest available size is normal.

What a Half-Size Difference Looks Like

Half a US size equals about 0.42 cm. That’s roughly the thickness of two stacked credit cards.

It sounds tiny. But it’s often the gap between a snug toe box and one with breathing room.

Cross a system boundary and the stakes go up. Converting a US 9 to UK means subtracting one, landing on UK 8. Get the direction backward, and you’ll order a size that’s a full number off.

On a men’s shoe, that’s over a centimeter of extra or missing length.

Kids’ Shoe Sizes: A Separate Scale

Kids’ sizing runs on its own numbering before switching over to adult sizes. That switch is where most parents get confused.

Kids’ numbering resets before it meets adult sizing.

Around a US kids’ 6 to 7, the numbering shifts into adult women’s sizing. A kids’ 6.5 lands close to a women’s 8. That overlap is why some retailers list “big kid” and small-adult sizes side by side.

The Most Reliable Method: Measure Your Foot

Charts are a starting point, not a guarantee. Measuring beats converting every time.

1. Stand on a sheet of paper. Trace your foot, holding the pencil straight up against your skin.

2. Measure the longest point from heel to longest toe, in centimeters.

3. Match that number to the specific brand’s own chart, not a generic US/UK/EU table.

4. Measure both feet. Most people have one foot that’s slightly longer, so size for the bigger one.

A tape measure beats guesswork every time.

This matters most when you’re buying from an overseas retailer. A generic conversion table can miss a specific brand’s actual sizing.

International returns are usually slower and pricier than a local exchange. Getting it right the first time saves real money.

Which Approach Fits Which Situation

A generic US/UK/EU table works fine for a rough estimate. Guessing a gift size for a friend is a good example.

It also works when you’re staying within one familiar brand you’ve bought before. Measuring in cm matters more for a new brand or a different country.

It matters most for athletic shoes, where fit tolerances run tighter. A running shoe half a size off can cause blisters over a long distance. A slightly loose dress shoe usually just needs a thicker sock.

Common Mistakes When Converting Shoe Sizes

Here are the errors that trip people up most.

• Treating the systems as a fixed offset. The US-to-UK gap shifts slightly across the range, especially in women’s sizing.
• Ignoring width. A correctly converted length can still feel wrong if the last runs narrower or wider than you’re used to.
• Assuming kids’ and adult sizing overlap cleanly. The transition point moves by brand.
• Trusting a generic chart over a brand’s own. A brand’s own foot-length chart beats any cross-system table, including the ones above.

Frequently Asked Questions

Is a UK shoe size just a US size minus one?
Roughly, yes, for men’s sizing. US 9 lands close to UK 8. It’s not exact across the whole range, and women’s sizing has a wider, less consistent gap.

Why do some EU sizes show a range like “42-43” instead of one number?
Because the two grids don’t align. EU sizing moves in whole Paris-point steps, while US sizing moves in half sizes. One US half-size can span two EU numbers.

Is measuring foot length in cm more reliable than converting a size?
Yes. Foot length in centimeters is fixed. A shoe size number is just a brand’s label, and labels vary. Measure first when ordering internationally.

Do men’s and women’s sizes convert the same way between US, UK, and EU?
No. They’re separate scales. A men’s US 8 measures about 26.7 cm; a women’s US 8 measures about 24.1 cm. Confirm which chart you’re reading before you convert.

At what age do kids’ shoe sizes switch to adult numbering?
It varies by brand. Most switch around a US kids’ 6 to 7, near a 22.5-23.5 cm foot. That’s why some retailers list overlapping “big kid” and small-adult sizes.

Why doesn’t a foot measurement in cm convert to a clean EU size?
Because EU sizing adds a manufacturing toe allowance on top of the Paris-point math. Rounding to the nearest available size is expected. Trying the shoe on beats doing the math by hand.

Should I size up or down when trying a new brand?
Size up, generally, for closed-toe shoes. A loose fit is easy to fix with a thicker sock. A too-short shoe isn’t fixable at all. Athletic shoes are the exception, since many already build in extra toe room — follow the maker’s own guidance there instead.