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Shoe Sizing & Fit Guide

Sizing varies more between brands than most people expect, so the number on the box is really just a starting point. A size 9 in one running shoe brand can fit like a 9.5 in another, especially between brands built on different foot shapes (wider toe boxes, narrower heels, and so on). When you’re between sizes, it’s usually safer to size up for athletic and running shoes, since your feet swell during activity and a little extra room in the toe box prevents black toenails on long runs or hikes. Dress shoes and boots, on the other hand, tend to fit truer to size or even run slightly large, so sticking with your usual size is often the better call there.

Reading Width, Not Just Length

If a shoe brand offers width options (narrow, standard, wide, extra-wide), it’s worth checking, especially for boots, sandals, and everyday sneakers you’ll wear for hours at a time. A shoe that’s the right length but too narrow is one of the most common reasons for returns. Product listings on Amazon usually note available widths in the size selector, so check there before ordering if you know you run wide or narrow.

When in Doubt, Check the Listing

Because sizing differs by brand and even by specific shoe model, the most reliable thing to do before buying is check that specific product’s size chart and recent buyer comments on fit, which are usually available right on the Amazon listing.

Read our full Shoe Buying Guide for more on sizing across brands, materials, seasonal picks, and care.