Shoe Size Converter: Translate US, UK, EU, and Mondopoint Sizes in Seconds
The Shoe Size Converter instantly converts between US men, US women, US kids, UK, EU, CM, and Mondopoint systems so you can buy shoes online with confidence.
Table of Contents
Buying shoes should be simple. You know your size, you pick a pair, you check out. Then the pair arrives from an overseas store, and it either pinches your toes or slides off your heel. The culprit is almost never the shoe — it is the size label. A US 9, a UK 8, and an EU 42.5 are roughly the same shoe, but nothing on the box tells you that.
The Shoe Size Converter solves this problem in one screen. Enter a size in any system — US men, US women, US kids, UK, EU, centimetres, or Mondopoint — and it instantly shows the equivalent in all seven systems at once, updating live as you type. No sign-up, no ads in the way, no guessing.
In this guide, we will walk through how the converter works, why shoe sizing systems diverge the way they do, and how to use conversion correctly when shopping for footwear online — including the common traps that catch out even experienced shoppers.
Why Use the Shoe Size Converter?
- All seven systems at once. Most size charts show two or three columns and force you to squint across rows. This tool gives you US men, US women, US kids, UK, EU, CM, and Mondopoint simultaneously in a single breakdown table.
- Convert from any direction. Start from an EU size, a UK size, a foot measurement in centimetres, or a raw Mondopoint figure — every system is an input, not just an output.
- Physically grounded. The converter pivots every conversion on Mondopoint (ISO 9407), the foot length in millimetres, so all systems stay mutually consistent instead of drifting the way chained lookups do.
- Live results as you type. There is no "Calculate" button to hunt for. Change the number or the system and the full breakdown refreshes instantly.
- Copy the whole table. A single copy button puts the full conversion breakdown on your clipboard — handy for saving next to a wishlist item or sending to family.
- Free, private, and instant. Everything runs client-side in your browser. Your measurements never leave your device, and there is nothing to install or register for.
Key Features
| Feature | What it does |
|---|---|
| Seven-system conversion | US men, US women, US kids, UK, EU, CM, and Mondopoint in one view |
| Any system as input | Pick your source system from the dropdown, not just US |
| Mondopoint pivot model | All systems derive from foot length in mm (ISO 9407) for consistency |
| Live breakdown table | Results refresh in real time as you type |
| Copy-all to clipboard | One click copies the complete conversion summary |
| Client-side processing | Fast, private, free — runs entirely in your browser |
Two details worth calling out. First, the tool distinguishes US men's, US women's, and US kids' numbering explicitly, because a "US 9" means three different lengths depending on which chart you are reading. Second, results include the raw centimetre and Mondopoint values, which are the most reliable numbers to compare against a manufacturer's own size chart when accuracy matters.
How to Use
- Open the Shoe Size Converter.
- Choose your source system from the dropdown — for example, US men if that is what you already know.
- Type the size value you have, including half sizes like 9.5.
- Read the breakdown table: all seven systems update instantly, with EU rounded to whole Paris points and Mondopoint shown in millimetres.
- Use the copy button to grab the full breakdown if you want to keep it beside a product page or share it with someone shopping for you.
Understanding Shoe Size Systems
Shoe sizing is a mess of historical accidents, and understanding why helps you convert correctly.
US sizes trace back to the Brannock device and count barleycorn-length increments (a third of an inch) from an arbitrary zero point. US men's numbering is the baseline; US women's shoes run about one full size larger on the same foot, so a US women's 10 fits the same foot as a US men's 9. US kids' and youth numbering restarts the scale, shifted by roughly 12.5 from the men's line.
UK sizes sit exactly one size below US men's numbering. A US men's 9 is a UK 8. The increment size is the same barleycorn; only the origin differs.
EU sizes use Paris points, where two-thirds of a centimetre equals one point. An EU 42 corresponds to a last length of 28 cm. Critically, EU sizes measure the last — the foot-shaped form the shoe is built around — not your foot, which is why the conversion includes roughly 2 cm of allowance and why EU sizing runs about a size and a half "generous" compared to a pure foot measurement.
CM and Mondopoint are the physical truth. Mondopoint (ISO 9407) is simply foot length in millimetres and is the standard used in ski boots, military footwear, and much of Asia. The converter pivots every calculation on this value: your input is first converted to a Mondopoint figure, then every other system is derived from it. Because the formulas are linear and share this single pivot, round-tripping between systems stays consistent — you never get the off-by-a-size drift that plagues chained chart lookups.
Finally, a caveat every converter should carry: manufacturers vary. A Nike US 10 and a New Balance US 10 can differ by half a size in real length. Treat conversions as a strong first approximation, then sanity-check against the brand's published chart using the centimetre value.
Practical Use Cases
Ordering shoes from overseas stores
You found the perfect pair on a Japanese site that lists EU and Mondopoint only. Enter the EU size, read the US equivalent to confirm it matches what you wear, and note the Mondopoint mm value to compare against the product's detailed spec. European and American sites differ by exactly the gap this tool closes.
Shopping for growing kids
Children's sizes are their own labyrinth — US kids, US youth, and EU sizes all shift at different points as feet grow. If you know your child's foot length in centimetres (measure it — it takes a minute), enter the CM value and read off every system at once. You will also see the youth line appear clearly, which tells you when it is time to stop shopping in the kids' section.
Measuring your foot properly and throwing away the label
If you have ever been between sizes in one brand but solidly a size in another, your true foot length is the answer. Measure your foot in centimetres, convert to every system, and you have a permanent reference that no brand's idiosyncrasies can confuse. This is also the approach to use for mail-order and gift shopping, where trying on is impossible.
Comparing sneaker and dress shoe sizing
Casual sneakers and dress shoes are built on different lasts with different allowances, which is why your running-shoe size and your oxford size often disagree. Converting both to centimetres shows you the actual length difference and helps you decide whether to size up or down for a specific style rather than guessing.
Best Practices
- Measure at the end of the day. Feet swell and are at their largest by evening; a morning measurement can leave you a half size short.
- Measure both feet. Most people have one longer foot. Size for the larger one.
- When in doubt, trust centimetres and Mondopoint. Physical length is the only value every sizing system ultimately refers back to.
- Check the brand's own chart. Use the converter to get in the neighbourhood, then confirm with the manufacturer's chart for the specific model.
- Respect half sizes. The converter accepts decimal inputs — enter 9.5, not "about 9 or 10".
- Remember that conversions are approximations. Last shapes, toe boxes, and intended fit (performance vs. comfort) all shift real-world fit beyond any table.
Convert Your Shoe Size Now
Stop squinting at conversion charts stitched together from three different websites. Open the Shoe Size Converter, enter the size you know, and get the full seven-system breakdown in the time it takes the page to settle. Bookmark it — the next time an overseas store lists sizes in a system you don't think in, you will be glad it's one click away.
Related Tools You Might Like
- Clothing Size Converter — the same idea for shirts, dresses, and trousers across regional systems
- Ring Size Converter — translate ring sizes between diameter, circumference, and regional standards
- Unit Converter — a general-purpose converter for length, weight, temperature, and more
Happy converting!