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UK to US Shoe Size Converter

Find your US shoe size from your UK size — with EU and CM conversions included.

Understanding the UK to US Size Conversion

UK shoe sizing dates back to a 19th-century English measuring system based on the barleycorn — literally the length of a grain of barley, about a third of an inch. Each whole UK size steps up by one barleycorn, which is also why UK and US sizes track closely but never line up exactly: they were built from different base units almost two centuries apart.

One scale for both sexes

The biggest structural difference from US sizing is that the UK system doesn't really have a separate women's scale the way the US does. UK sizes are numbered on one continuous unisex range, and retailers apply a rough offset — usually around 1.5 sizes — to translate a UK number into a US women's size. That offset is a convention, not a formal standard, so it can vary slightly between brands.

Half sizes are less common

Many UK retailers and brands stock a narrower range of half sizes than their US counterparts, particularly outside sizes 6 to 9. If you're between sizes and shopping a UK-based site, it's worth checking stock on both the size below and above before assuming a half size will be available.

The most common mistake

A lot of UK retailers — including well-known ones — list sizes only in the UK scale with no US or EU conversion shown on the product page. Assuming your UK number simply carries over, or guessing at the conversion, is the single most common reason for a return when buying sneakers from a UK site. Running the exact UK number through a converter before you check out takes seconds and avoids most sizing returns.

Kids sizing runs straight into adult UK sizes

Unlike the US, where kids and adult scales are separate systems with their own numbering, UK kids sizing runs on the same continuous scale as UK adult sizing — a kids' UK 13 is followed directly by an adult UK 1. That makes it more straightforward to size up a growing kid using the same chart.

Sneaker Size Converter

Find your perfect fit across every sizing system, instantly. Convert between US, UK, EU, CM and Korean sizing for men, women and kids — with brand-specific fit guides for Nike, Adidas, Jordan and more.

Men's Sneaker Size Converter

Select your size system, pick your size, and every equivalent appears instantly.

I know my size in
Select your size
US—
UK—
EU—
CM—
Korean—
Enter your foot length above for a size recommendation.

⚠ Sizing varies between brands and styles. These conversions are a guide — always check the brand's own size chart before buying.

Women's Sneaker Size Converter

Select your size system, pick your size, and every equivalent appears instantly.

I know my size in
Select your size
US—
UK—
EU—
CM—
Korean—
Enter your foot length above for a size recommendation.

⚠ Sizing varies between brands and styles. These conversions are a guide — always check the brand's own size chart before buying.

Kids' Shoe Size Converter

Choose an age category, then select your size system for instant conversions across US, UK and EU.

Age category
I know my size in
Select your size
US—
UK—
EU—
CM—
Enter your child's foot length above for a size recommendation.

⚠ Kids' feet grow fast — measure regularly and always allow a little extra room. Check the brand's own chart before buying.

Sneaker Brand Size Guide

Not all sneakers fit the same. Here's how the major brands run relative to your true size — so you know before you buy. We've noted which specific models are affected and how much to adjust.

Brand Fit Adjustment Notes
Nike True to Size None needed Generally TTS across most styles. Air Force 1 fits slightly roomy. React and Pegasus running shoes can run narrow — wide-footer types should consider half a size up.
Adidas Runs Small Go ½ size up Ultraboost and NMD run about half a size small. Stan Smith and Gazelle are TTS but fit narrow — if you have wider feet, go half a size up. Yeezy sizing varies by model.
New Balance True to Size None needed TTS with excellent width options (B through 4E). Known for a comfortable, slightly roomier toe box than Nike. 990, 574 and 550 are all reliably TTS.
Jordan True to Size None needed Most Jordan models are TTS. Air Jordan 1 fits wide and roomy — narrow-foot types can size down half. Jordan 11 runs a touch large; some people prefer half a size down.
Vans Runs Large Go ½ size down Old Skool and Sk8-Hi run slightly long — go half a size down if between sizes. Canvas styles stretch a little with wear. Slip-ons tend to feel roomy, so size down more confidently.
Converse Runs Very Large Go 1–1.5 sizes down Chuck Taylors are famous for running big. Men should go 1 to 1.5 sizes down. Women should go down 2 full sizes (they use unisex sizing). The roomy toe box gets roomier as the canvas breaks in.
Puma True to Size None needed Suede Classic and RS models are reliably TTS. Puma fits slightly narrow across most styles — wider feet may prefer to go half a size up for comfort on longer wear days.
Reebok True to Size None needed Classic Leather and Club C are TTS. Reebok generally fits well across widths. Instapump Fury runs slightly narrow. Classics tend to have a slightly roomier toe box than running styles.

Fit notes reflect general fit across popular models and community feedback. Individual styles may vary. Always check the specific product page for fit recommendations before purchasing.

Sneaker Sizing — Frequently Asked Questions

How do I convert US shoe sizes to EU? +
To convert US men's sizes to EU, add roughly 33 to your US size — so a US 10 is approximately EU 44. For women, add about 31 to your US size, so a US 8 is around EU 38.5. The easiest approach is to use the converter above, which gives you the exact EU equivalent for your size instantly.
What is my shoe size in CM? +
Your shoe size in CM refers to the length of your foot in centimetres. You can measure it by standing on a piece of paper, tracing around your foot and measuring from heel to the tip of your longest toe. A US men's 10 is approximately 28cm, and a US women's 8 is approximately 25cm. Use the foot length helper in the converter above for an instant size recommendation.
Do Nike shoes run true to size? +
Nike shoes generally run true to size, but fit can vary by model. Running shoes like the Pegasus and React Infinity tend to be accurate to your normal size, while lifestyle styles like the Air Force 1 can feel slightly roomy. If you're between sizes in Nike, most people are comfortable going half a size down.
What is the difference between men's and women's shoe sizing? +
Men's and women's shoe sizes use different numbering systems even though they can refer to the same foot lengths. A women's US 8 is roughly equivalent to a men's US 6.5 — women's sizes run about 1.5 sizes larger than men's for the same foot. Women's shoes are also typically made on a narrower last, which matters when buying unisex or crossover styles.
How do I convert kids' shoe sizes to adult sizes? +
Big kids' sizes (Y) run up to a US 7Y, which is close to a US 7 in women's or a US 5.5 in men's. Kids' sizes and adult women's sizes overlap closely — a kids' 5Y is roughly a women's US 6.5. If you have wide feet, adult sizing is usually a better option since it comes in more width choices than kids' shoes.
What shoe size is EU 42 in US? +
EU 42 is a US men's 8.5 or a US women's 11, depending on the gender sizing chart you're using. EU sizes use the same number across men's and women's but the equivalent US size differs between the two. Use the converter above to check both conversions instantly.
Do Converse run big or small? +
Converse sneakers are well known for running big — most people go 1 to 1.5 sizes down from their usual size. The classic Chuck Taylor has a roomy toe box and uses unisex sizing, so women typically need to go down 2 full sizes compared to their normal women's size. If you're a US men's 10 in most brands, start with a Converse 9.

Frequently Asked Questions

What is UK 9 in US?

UK Men's 9 converts to US Men's 10. UK Women's 9 is approximately US Women's 11, though the women's offset can vary slightly by brand.

Is UK shoe size the same as US?

No — US men's sizes generally run one full size larger in number than the equivalent UK size for the same foot length. The two systems were built from different base measurements, so they never line up as a simple round conversion.

What is UK 7 in US women's?

UK 7 is approximately a US Women's 9. Since the UK scale is unisex, the same UK 7 converts to a US Men's 7.5 if you're checking the men's chart instead.

Are UK and Australian sizes the same?

Men's UK and Australian sizes are generally identical, since both markets historically used the same barleycorn-based system. Women's and kids' sizing can differ slightly by brand, so it's worth double-checking on anything other than a standard men's style.

Why don't UK sizes have a separate women's scale?

UK sizing was built as one continuous numbering system rather than the split men's/women's scales the US uses, so retailers apply their own offset — usually around 1.5 sizes — to give a women's-equivalent number. That offset isn't standardized, which is why conversions can shift slightly between brands.

Do UK sizes run in half sizes?

Yes, but stock of half sizes is often narrower than in the US, especially outside the UK 6–9 range. If you're between sizes on a UK site, it's worth checking availability on both the half size and the whole size above before ordering.