A European size 42 in US women’s shoes is generally an 11.5. That mapping shifts from brand to brand, and some labels skip 11.5 entirely, forcing a choice between a tight 11 and a loose 12.
The width of your foot matters as much as the length: Naturalizer’s size chart shows nearly six-tenths of an inch of variation between narrow and wide within a single length size, which can move you up or down a half size.
Size 42 Shoe Conversion
A European size 42 generally maps to US women’s size 11.5. That is the starting point, not the finish line.
Fit shifts from label to label. One brand’s 11.5 runs generous in the toe box; another cuts narrow through the arch and the same foot swims or pinches.
The half-size gap between an 11 and a 12 is substantial when you are already at the larger end of standard ranges, where many brands simply stop.
Some houses do not produce an 11.5 at all, forcing a choice between sizing down and hoping the leather gives or sizing up and adding an insole.
This is why a tape measure beats a conversion table. Foot length in centimeters or inches tells you what the brand’s own size chart actually says, and from there you can account for how that last was shaped.
I treat 42 as a signal to check the chart, not as a number I can trust at checkout.
How to Measure Your Foot
Foot length alone tells only half the story when you are converting size 42 in US women’s shoes. Width matters just as much for whether a shoe actually fits, and the tracing method catches both.
- Stand on a blank sheet of paper and trace around the edges of one bare foot, keeping the pen upright. Tilting it even slightly adds width that is not really there.
- Measure the longest part of the tracing, heel to toe, for length. Then measure the widest part across the ball of the foot. Write both numbers down in inches or centimeters, whichever your preferred chart uses.
- Repeat with your other foot. Most people have one foot slightly larger, and that is the foot you size for.
- Compare those two measurements to a brand’s size chart, not just the conversion for size 42 in US women’s shoes. A 42 can translate to anywhere from 10 to 11.5 US depending on the maker, and the width measurement tells you whether to look for narrow, standard, or wide options within that size.
Width and Why It Changes the Size You Buy
A size 42 conversion chart gives you the length, but your foot has a second dimension that can move you up or down a half size.
Width matters just as much as length, especially if you have ever bought a shoe that technically fit while your toes were squeezed from the sides.
Naturalizer’s approach is to measure the widest part of your foot and match it to the same size row.
For a foot measuring 8.62 inches long, the narrow width starts at 2.99 inches and the wide width runs to 3.58 inches. That is nearly six-tenths of an inch of difference within a single length size.
A size 42 European length might translate to a US 10 in theory, but a foot at 3.39 inches wide would need the medium width in that length, and a foot at 3.58 inches would need the wide.
The length number alone would send you home with the wrong shoe.
To find your width, measure the widest part of your foot and use the table above to determine your size.
If you are between widths, the wider option almost always wins for daily wear. A slightly too-wide shoe can be tightened with laces or an insole; a too-narrow shoe will pinch for the life of the sole.
Frequently Asked Questions
What is size 42 in US women’s shoes?
A European size 42 generally maps to US women’s size 11.5. That is only a starting point, though.
Brand sizing varies, and a 42 can translate to anywhere from 10 to 11.5 US depending on the maker. Always check the brand’s own size chart before buying.
How to measure shoe size?
Stand on paper and trace around your bare foot with the pen held straight up. Measure the longest point from heel to toe, then the widest part across the ball of the foot.
Size for your larger foot if they differ, and compare both numbers to the brand’s chart rather than relying on a generic conversion.
