🔄 US to UK Shoe Size Converter

How US and UK Shoe Sizes Convert

Select men's or women's, pick the direction, enter the size, and the converter applies the standard offset. Men's UK is US minus 0.5; women's UK is US minus 2. Reverse direction adds instead of subtracting. Results round to the nearest half size, the smallest step shoe sizes use.

The Rules

Both systems measure in barleycorns (1/3 inch per whole size) from different zero points, so the offset is constant across the whole range. Men's US 10 is UK 9.5; women's US 8 is UK 6. Reversed, men's UK 9 is US 9.5 and women's UK 6 is US 8. The calculator round-trips cleanly because the offset never changes.

Worked Example

Ordering British-made men's shoes in US 10: subtract 0.5 to get UK 9.5. A women's US 8 ordering from a UK site: subtract 2 to get UK 6. Coming back, UK 9.5 men's is US 10, and UK 6 women's is US 8. Four conversions, one rule each, zero ambiguity.

Why the Offset Exists

UK sizing starts its scale at a different foot length than US sizing, a legacy of separate shoemaking traditions that both used the barleycorn inch. The men's and women's US scales themselves start at different points too, which is why the two offsets differ. EU sizing sidesteps all of this with the Paris point, which is why three systems describe the same foot three ways.

Brand Variation Warning

The 0.5 and 2 offsets are the industry standard, but individual brands tune fits: some run a half size small or large deliberately. Nike's chart, for example, lists men's US 9 as UK 8 rather than 8.5. For shoes over $100 or performance footwear, check the brand's own chart and read reviews for "runs small" or "runs large" notes before ordering across systems.

Quick Reference

Memorize two numbers: men's minus a half, women's minus two. Everything else on this page is commentary. When a UK site lists only UK sizes, apply the rule and order with confidence; when it lists both, you now know how to sanity-check their conversion.

Ordering Shoes From Abroad

Cross-border shoe shopping is where conversion errors cost real money in return shipping. Convert with the tool above, then check the retailer's own chart before paying: international listings sometimes convert sloppily. Read the reviews for fit notes, confirm the return policy covers international orders, and remember that sale items are often final. When the price is good and the chart checks out, the 0.5/2 rule has your back.

A Second Worked Example: The EU Detour

Ordering from a European site adds a third system. The Paris point, the EU unit, is 2/3 cm, and the standard conversions run: men's US 9 is UK 8.5 is EU 42; US 10 is UK 9.5 is EU 43; US 11 is UK 10.5 is EU 44.5. Women's US 7 is UK 5 is EU 37.5; US 8 is UK 6 is EU 38.5; US 9 is UK 7 is EU 39.5. So a women's US 8 ordering from a French site wants EU 38.5, and a men's US 10 wants EU 43.

EU sizes are the least standardized of the three in practice: brands interpret the scale differently, and half sizes vanish at some makers. Treat the EU number as a starting point and check the brand's centimeter chart, which is the only part of a European size chart you can fully trust.

Foot Length in CM: The Universal Language

Every size system is just a way of encoding foot length, so skip the encoding and use the length. Stand on paper, mark heel and longest toe, measure in centimeters. That number, compared against the brand's cm chart, beats any US/UK/EU conversion. The barleycorn behind the UK and US systems is 1/3 inch, about 0.85 cm per whole size, which is why sizes step the way they do.

Measure in the afternoon, wearing the socks you will wear with the shoes. Feet swell through the day, and a morning measurement in thin socks undersizes an afternoon foot in hiking socks by a half size or more. Measure both feet and fit the larger; most people have one foot up to a half size bigger than the other, and shoes are sold in pairs.

Common Conversion Mistakes

First: applying the men's offset to women's sizes. Men's UK is US minus 0.5; women's is US minus 2. Mixing them up puts you a size and a half off. Second: assuming the conversion is the fit. The offset converts the scale, not the last: a UK 9.5 from one British maker fits differently than a UK 9.5 from another. The brand chart still rules.

Third: forgetting width. US/UK length conversions say nothing about width, and European shoes often run narrower than American ones. If you wear wide, check the width designation, not just the length conversion. Fourth: converting kids' sizes with adult offsets. Kids' scales are their own systems with different zero points; use a kids' chart. Fifth: ordering sale shoes in a rush without checking. Final-sale footwear in the wrong converted size is an expensive souvenir.

The Barleycorn: Why Sizes Are Thirds of an Inch

US and UK shoe sizes descend from the barleycorn, an old English unit equal to one-third of an inch. Each full size is one barleycorn longer than the last, which is why the scale is linear and the US/UK offset is a constant one size for men. The system is medieval but functional: a men's US 10 is 10 and 2/3 inches of last length in theory, though modern lasts add wiggle room. Children's sizes reset at a different zero, which is why kids' 13 becomes adult 1 with no continuity. The whole edifice is folk measurement that survived because it works well enough, not because it is precise.

Worked Example: The EU Detour, Done Right

You wear US men's 10, which is UK 9. Ordering from a German site, the chart says EU 43. But EU sizing runs in two-thirds-centimeter steps with no half sizes standardized, and brands round differently: some call US 10 a 43, others a 44. The fix is the centimeter number. Measure your foot at 27.5 cm; buy the size whose "foot length" spec is 27.5 to 28 cm, ignoring the converted number entirely. For running shoes add a half centimeter for toe splay; for dress shoes buy exact. The conversion chart gets you close. The centimeter gets you home.