Find your sock size band (S/M/L/XL) and numeric size from your US shoe size or foot length, with the EU and UK shoe equivalents.
Sock sizes are approximate and vary by brand — socks stretch, so one band fits several shoe sizes.
About this tool
This tool converts a shoe size or foot length into sock sizing, running entirely in your browser with nothing uploaded. Pick whether you're entering a US shoe size or a foot length, choose men's or women's, and read off the recommended sock size.
Socks are usually sold in bands (S, M, L, XL) that cover a range of shoe sizes, plus a printed numeric range such as 9–11 or 10–13. The tool maps your US shoe size to the correct band and numeric range using standard shoe-size brackets. If you enter a foot length instead, it first estimates your US shoe size (adding the usual last/ease allowance — about 18 cm for men, 16.5 cm for women) and then finds the band. It also shows the EU and UK shoe-size equivalents via the common offsets.
Because socks stretch, one band typically fits several shoe sizes. If your shoe size sits at the very top of a band, the next size up often feels better, especially for cushioned or compression socks.
Frequently asked questions
What do the numbers like 9–11 mean?
That is the sock's stated size range, historically the length of the foot in inches. A 9–11 sock suits smaller feet (about a men's shoe up to the mid-8s) and 10–13 covers larger feet.
I only know my foot length — can I still use this?
Yes. Switch to foot length, enter it in inches or centimeters, and the tool estimates your US shoe size first, then gives the matching sock band and numeric size.
Why do men's and women's give different results?
Men's and women's shoe sizes run on different scales, so the same foot maps to different numbers. Selecting the right gender ensures the shoe-to-sock band lookup and the EU/UK equivalents are correct.
How accurate are sock sizes?
They are approximate and vary by brand. Socks are stretchy and one band covers several shoe sizes, so use the result as a guide and check the brand's own range when it matters.