US to EU Shoe Size Conversion: Finding Your Perfect Fit Globally
Shopping for shoes internationally? Use our guide to convert US sizes to European standards for men, women, and children.
Introduction
Shoe sizing is the least standardised measurement in everyday life. Unlike a metre or a kilogram, there is no international body defining what a size 9 is, and no two systems even agree on what they are measuring. Some describe the foot, some describe the last the shoe was built on, and the increments differ.
That is why a conversion chart gets you close and almost never gets you exact. This guide explains what each system counts, gives the usual equivalents, and sets out the one measurement that travels reliably across all of them.
What Each System Actually Measures
US and UK sizes descend from the barleycorn, an old English unit of one third of an inch. Each full size step is one barleycorn, or about 8.5 mm, and each half size is half of that. The systems are offset from each other, so a UK size is typically about one less than the equivalent US men's size.
European sizes use the Paris point, which is two thirds of a centimetre, or about 6.67 mm per size. Because the increment is smaller, European sizes climb faster: a single US size step spans roughly one and a half European sizes.
That mismatch in step size is the root of the problem. The two scales cannot line up neatly, so any conversion table is rounding somewhere, and half sizes in one system frequently have no exact partner in the other.
The Usual Equivalents
For men's sizes, the rough relationship is that the European size is about one and a half times the US size, plus roughly 33:
- US 7 ≈ EU 40
- US 8 ≈ EU 41
- US 9 ≈ EU 42.5
- US 10 ≈ EU 44
- US 11 ≈ EU 45
- US 12 ≈ EU 46
Women's sizing carries an additional offset, because US women's sizes run roughly one and a half to two sizes above men's for the same foot length:
- US W 6 ≈ EU 36 to 37
- US W 7 ≈ EU 37 to 38
- US W 8 ≈ EU 38 to 39
- US W 9 ≈ EU 39 to 40
- US W 10 ≈ EU 40 to 41
The ranges are honest rather than vague. Manufacturers genuinely disagree at this level of precision.
Measure Your Foot Instead
The one number that survives every conversion is the length of your foot in millimetres. This is the basis of Mondopoint, the system used for ski boots and by several militaries, and increasingly the figure that online retailers publish alongside their size charts.
To measure properly:
- Stand on a sheet of paper with your heel against a wall, with your weight on the foot.
- Mark the paper at the tip of your longest toe, which is not always the big toe.
- Measure from the wall to the mark in millimetres.
- Repeat for the other foot, and use the larger figure. Most people have feet of slightly different length.
- Measure late in the day, when feet are at their largest.
Given a length in millimetres, a brand's own chart will place you far more accurately than any generic conversion. Length in centimetres also converts directly between systems, which our guide to meters and feet covers at larger scales.
Why the Chart Still Gets It Wrong
Three factors defeat even a correct conversion.
Brands differ. Two shoes both labelled EU 43 from different manufacturers can differ by most of a size. Sports brands in particular have reputations for running consistently large or small, and those reputations are usually accurate.
Width is invisible. The number describes length only. A foot that is wide for its length will feel cramped in a correctly sized shoe, which is why some ranges offer width fittings and why the same size fits differently across styles.
Shape matters more than size. A pointed dress shoe and a running shoe built on a rounded last will fit differently at identical stated sizes, because the space is distributed differently.
Buying Online Across Systems
A few habits reduce the risk considerably. Work from the retailer's own chart rather than a generic one, since the retailer knows its own lasts. Look for a foot length in centimetres and match to that rather than to a size number. Read reviews for consistent reports that an item runs large or small, which is often the most reliable signal available. And check the returns policy before ordering internationally, because return shipping frequently costs more than the difference between two sizes is worth.
Common Mistakes Worth Avoiding
Treating a conversion as exact
The increments genuinely do not align. A converted size is a starting point for a fitting, not an answer.
Using men's and women's charts interchangeably
The offset between them is one to two sizes, which is more than enough to make a shoe unwearable.
Measuring one foot only
Asymmetry is normal. Fit the larger foot; the smaller one can be adjusted with lacing or an insole.
Conclusion
The step sizes in the American and European systems were never designed to align, so conversion charts approximate by necessity. Use the chart to narrow the range, then trust a foot measurement in millimetres and the individual brand's own guidance for the final decision.
Try our shoe size converter for quick and accurate conversions across international sizing systems.