Free Shoe Size Converter Online

A shoe size converter translates a shoe size between US men's, US women's, UK, EU, and centimeter foot-length systems, which matters the moment you're buying from an overseas retailer, checking a size chart on an imported pair, or just trying to make sense of a shoebox label printed for a different market than the one you shop in. Worth saying up front, because it shapes everything else in this article: shoe sizing was never standardized globally the way, say, a liter or a kilogram is, so any US-UK-EU-CM conversion is an approximation rather than an exact figure — this shoe size converter uses a documented, internally consistent model, but a specific brand's actual last (the mold a shoe is shaped around) can still put its true fit half a size or more off from the converted number.

How the Shoe Size Converter Works

On the tool page, you enter a US men's size and the result comes back with the EU, UK, and centimeter foot-length equivalents shown together in a single output.

• Type your US men's size into the input field — this is the converter's reference starting point on the page.
• The result returns the EU size, the UK size, and the foot length in centimeters all at once, so you don't need to run three separate lookups.
• If your starting size is in US women's, UK, EU, or centimeters instead of US men's, the API version of this converter (linked below) accepts any of those five systems as the starting point and any other as the target.

The conversion runs entirely on your own device — the size you enter is never sent off anywhere to be processed. If you're building shoe size conversion into a sizing tool, a checkout flow, or a product catalog rather than checking sizes one at a time on the page, this converter is also available as a documented API endpoint, with the full parameter list at /docs.

Why You'd Convert a Shoe Size

Shoe size conversion tends to come up whenever a purchase or fitting crosses a regional boundary:

• Ordering from an overseas online retailer. A European shoe site will list sizes in EU numbering, and if your own reference point is a US or UK size, converting first is the difference between ordering confidently and guessing.
• Traveling and needing to buy shoes abroad. If a shoe wears out or a special occasion comes up mid-trip, a local shop's sizing will be in whatever system that country uses, and knowing the rough equivalent to your home size saves an awkward back-and-forth with a salesperson.
• Buying a gift for someone whose size you only know in a different system. If you know a friend or family member's UK size but you're shopping a US-only retailer, converting first narrows down which size to actually order.
• Double-checking a size before a non-refundable overseas purchase. Some international sellers don't accept returns or charge steep return shipping, which makes getting the converted size right before checkout more valuable than it would be for a local, easily-returnable purchase.
• Reading a secondhand or resale listing. Resale marketplaces sometimes list sizes in whichever system the original seller's region uses, which may not match the system the platform's search filters default to, so double-checking the conversion avoids ordering the wrong size.
• Comparing kids' and adult sizing at the transition point. As a foot approaches adult length, distinguishing between a youth size and the equivalent adult size in another region's numbering is a common point of confusion this kind of tool helps sort out.
• Filling out an international shipping or customs form. Some cross-border retailers ask for a size in a specific system on their intake form regardless of what system you shop in day to day, and converting ahead of time avoids submitting a size that doesn't match what the form expects.

Technical Deep Dive: How the Conversion Model Works — and Where It Breaks Down

This converter pivots every size through foot length in centimeters, using a widely cited reference anchor: US men's size 9 corresponds to UK 8.5, EU 42.5, and a 27 cm foot length. From that anchor, US and UK sizes step by 1/3 of an inch of foot length per full size (the traditional English "Barleycorn" measurement rule), while EU sizing — sometimes called the Paris point system — steps by 2/3 of a centimeter per full size. US women's sizing in this model runs 1.5 sizes higher than the equivalent US men's size, and UK sizing runs half a size below US men's, which is exactly what the anchor point above reflects (US men's 9 = UK 8.5).

The honest caveat, and the reason "converter" here means "well-informed estimate" rather than "exact answer": no two shoe brands cut their lasts identically, so a size that converts cleanly on paper can still fit differently between, say, a running shoe brand and a dress shoe brand, or even between two models from the same brand. A size that this model puts at EU 42.5 might genuinely fit as a 42 in one brand's last and a 43 in another's. The conversion is a solid starting point for narrowing down which size to try or order, not a guarantee that it will be the exact right fit for every manufacturer.

US Men's	US Women's	UK	EU	Foot length (cm)
7	8.5	6.5	40	25.3
8	9.5	7.5	41	26.2
9	10.5	8.5	42.5	27.0
10	11.5	9.5	44	27.8
11	12.5	10.5	45	28.7

That table is generated from the same anchor-and-step model described above, and it's worth reiterating that the EU column values are rounded to the nearest half size for readability — the underlying centimeter-based math is continuous, which is exactly why the tool computes it rather than relying on a fixed lookup table.

It's also worth noting what this model deliberately leaves out: width. A shoe size number by itself, in any of the five systems here, describes length only, not how wide or narrow the shoe is cut. Two people with an identical foot length can need noticeably different shoes if one has a narrow foot and the other a wide one, and no length-based conversion — this one included — can account for that on its own. Some brands add a separate width designation (like "D" or "EE" for men's US sizing) precisely because length alone doesn't fully describe fit, and that designation doesn't have a general cross-brand conversion the way length does.

Shoe Size Converter vs Other Approaches

• The specific brand's own size chart. If you're buying from a brand that publishes its own US-to-EU-to-UK chart, that's more accurate for that specific brand's shoes than any general conversion, since it reflects their actual last rather than an industry-wide average.
• Measuring your foot with a Brannock device at a shoe store. The most reliable way to establish your true foot length in centimeters or inches, which then feeds into any conversion — this is the gold standard, but it requires an in-person visit rather than a quick online check.
• A generic printed conversion chart on a shoebox or retail sign. Convenient at the point of purchase, but usually condensed to whole sizes only and not always built from a documented, consistent model.
• A dedicated shoe size converter. Gives you a quick, consistent, half-size-aware estimate across US men's, US women's, UK, EU, and centimeters without needing a specific brand's chart on hand — useful as a starting point before checking that brand's own sizing if precision matters.

Common Questions About Shoe Size Conversion

How accurate is a shoe size converter, really?

It's a reliable approximation — typically within about half a size of most brands' own charts — but not an exact guarantee, since no single global standard governs how shoes are sized, and each manufacturer's last shapes the actual fit slightly differently.

Why does my actual shoe size differ from what the converter says?

Because the converter applies one consistent model across all brands, while real shoes are shaped around each manufacturer's own last. A brand that runs narrow, wide, long, or short relative to the industry average will naturally diverge from any general conversion by roughly half a size in either direction.

What's the actual difference between US men's and US women's sizing?

US women's sizing runs about 1.5 sizes higher than the equivalent US men's size for the same foot length — so a US men's size 9 is roughly equivalent to a US women's 10.5, not the same number carried over from one scale to the other.

How do I measure my own foot length for a more accurate conversion?

Stand on a sheet of paper, trace your foot, and measure the longest point from heel to toe in centimeters — that figure can be converted directly using the "cm" option in this tool, which tends to be more reliable than starting from a size you're unsure was accurate to begin with.

Is EU sizing the same across all of Europe?

Broadly yes — the EU (Paris point) system is used consistently across most of continental Europe, which is one of its practical advantages over UK or US sizing when shopping from multiple European retailers.

Does this converter handle kids' shoe sizes?

No — this model is built around adult foot-length ranges. Kids' sizing uses its own separate numbering system in most regions rather than a straightforward extension of adult sizing, so it isn't covered by this converter's anchor points.

Does a shoe size converter account for shoe width?

No, and this is worth understanding before ordering based on a converted size alone. Every system covered here — US men's, US women's, UK, EU, and centimeters — describes foot length, not width, so two people with the same converted size can still need different width fittings depending on their individual foot shape.

Should I round a converted size up or down when it lands between two numbers?

When in doubt, most footwear guidance leans toward rounding up rather than down, since a slightly roomier shoe is generally more comfortable than a slightly tight one — but this is a general guideline, not a rule, and it can vary by shoe type and personal preference.

Related Tools

If you're working from a raw foot-length measurement rather than an existing shoe size, the Length Converter is useful for moving between centimeters and inches before you even open this tool. For broader body-measurement needs alongside shoe fitting, the BMI Calculator and Body Fat Calculator cover other common personal-measurement questions people look up in the same session. And if a package or gift ships with weight limits to check before sending shoes overseas, the Weight Converter handles that conversion too. Developers integrating shoe size conversion into a sizing widget or product page instead of using this tool directly can find the full API reference at /docs.