Enter a men’s US shoe size to see the equivalent women’s US, UK and EU sizes — for shopping across sizing systems.
What Is a Shoe Size Converter?
A shoe size converter translates between the world’s sizing systems: a men’s US 9 is roughly a women’s US 10.5, a UK 8 and an EU 42. The US and UK systems share the barleycorn (1/3 inch per size) but start from different baselines; the EU system is based on the Paris point (2/3 cm per size). Conversions are approximate: brands fit differently, so always check the brand’s own chart for an exact match.
How to Use
- Enter the men’s US size.
- Click “Convert Shoe Size” for the women’s US, UK and EU equivalents.
Formula
Women’s US = men’s US + 1.5. UK = men’s US − 1. EU = men’s US + 33.
Worked Example
Men’s US 9 → Women’s US 10.5, UK 8, EU 42.
How It Works, In Plain Words
There is no single world shoe size, so this tool translates with three fixed offsets from the one number you type: your men’s US size. The women’s US figure is 1.5 sizes higher, because the women’s scale runs ahead of the men’s — the page’s mistakes list flags exactly that gap as the one shoppers trip over. The UK figure is 1 lower: the US and UK systems climb in identical barleycorn steps of 1/3 inch per size, but they start counting from different baselines, so the same foot carries a number one apart. The EU figure adds 33, bridging to a system built on the Paris point of 2/3 cm per size instead.
Worked through with the example, a men’s US 9 becomes a women’s US 10.5, a UK 8 and an EU 42. The input accepts half sizes too, and the same three offsets apply to them. What the tool cannot do — and says so under its own result — is guarantee a fit: these are the standard conversions, while the last, the mould a shoe is shaped on, belongs to each brand. That is why the result ends with the reminder to check the size chart before you buy.
Real-World Uses
A shopper in the UK ordering from an American store converts their size once instead of guessing at the checkout — the cross-border shopping this page was built for. Someone eyeing a European brand sold only in EU sizing checks that their men’s US 9 lands at EU 42 before paying for delivery. And a buyer choosing a unisex style, or a pair as a gift, uses the women’s conversion to move between the men’s and women’s scales — 9 on one side, 10.5 on the other — rather than assuming the numbers match across the aisle.
Benefits
- All four systems in one click
- The approximation honestly flagged
- Useful for cross-border shoe shopping
- Simple one-input tool
Features of Our Tool
- Instant results in your browser
- No sign-up, no download, 100% free
- Works on mobile, tablet and desktop
- Clear step-by-step explanation below the tool
- Private — your entries never leave your device
Common Mistakes
- Treating conversions as exact — brands vary by half a size or more
- Mixing men’s and women’s US (1.5 sizes apart)
- Assuming EU sizes are linear — they are, but last shapes differ
Common Mistakes to Avoid
The expensive mistake is treating the converted number as a promise: brands vary by half a size or more, so the conversion is your starting point, not the finish — the brand’s own chart settles it. Next comes mixing the men’s and women’s US scales, which sit 1.5 sizes apart; a straight swap buys the wrong shoe. Shoppers also assume that because EU sizes are linear, EU 42 fits the same everywhere, but last shapes differ between makers even at the same number. Finally, order with the approximation in mind: where a seller offers returns, they are worth having when a converted size is involved.
FAQ
What is US men’s 9 in UK?
UK 8.
What is US men’s 9 in EU?
EU 42.
What is US men’s 9 in women’s?
Women’s US 10.5.
Are shoe size conversions exact?
No — they are approximate; brands fit differently, so check each brand’s size chart.
How do EU sizes work?
EU sizes use the Paris point (2/3 cm per size), so a men’s US 9 ≈ EU 42.
Can I enter half sizes?
Yes — the input accepts half sizes, and the same three offsets apply: add 1.5 for women’s US, subtract 1 for UK, add 33 for EU. Half a size is also roughly the amount brands can vary by, as the mistakes list notes, so treat the result as a starting point and check the brand’s chart.
Why do UK and US sizes differ if they use the same steps?
Because they start from different baselines. As this page explains, both systems share the barleycorn — 1/3 inch per size — but count from different starting points, which is why the UK figure sits 1 below the men’s US figure here: US 9 becomes UK 8.