Find your shoe size from one foot measurement.

35 brands, grouped by what they make: athletic (Adidas, ASICS, New Balance, Nike, Puma, Reebok, Under Armour); running (Altra, Brooks, Hoka, Mizuno, On, Salomon, Saucony); hiking & outdoor (Columbia, Danner, Keen, LOWA, Merrell); boots (Blundstone, Dr. Martens, Red Wing, Timberland, UGG); casual & skate (Clarks, Converse, Skechers, Sperry, Steve Madden, TOMS, Vans); sandals & comfort (Birkenstock, Chaco, Crocs, Teva), plus a generic international estimate. A few have quirks worth knowing: Crocs uses whole sizes only, Birkenstock is sized natively in EU rather than US/UK, Blundstone's half sizes add width rather than length, and Dr. Martens' UK-to-US labeling varies by model. Each is flagged directly in that brand's result.

Stand on a piece of paper on a hard floor, have someone mark the back of your heel and your longest toe, then measure the straight-line distance between the marks. That's your foot length. It takes about two minutes with just paper, a pencil, and a ruler; the full step-by-step Measurement Guide below covers socks, weight distribution, and a few details that affect accuracy.

Measure straight across the widest part of your forefoot, from one side to the other, with your weight on the foot: a straight-line width, not a measurement taken around the foot. As a sanity check, an average adult forefoot is roughly 9 to 11cm across; a figure much above that is a circumference rather than a width. Width matters because length alone will not tell you whether a shoe pinches, and a shoe that is the right length but too narrow often gets mistaken for one that is too small. Full instructions are on the measuring guide, and you can enter the measurement in the calculator above to get a width letter.

Each brand designs its own "last" (the foot-shaped mold a shoe is built around) and publishes its own size chart against that last. Two brands can label very different foot lengths with the same size number. That's why this calculator works from your actual foot length in centimeters and looks it up against each brand's own published chart, rather than assuming a size number carries over between brands.

Each system was standardized independently and doesn't share a common reference point. EU sizing, for example, is based on the "Paris point," where each whole size represents about 6.67mm of length, a completely different basis than the US or UK scales. None of them convert to each other with one fixed offset, which is exactly why this calculator starts from your actual foot length instead of a size number in any single system.

It depends on the brand, which is the whole reason this site exists. A 26 cm foot is a men's US 8 in Nike and most other brands, but a US 7 in Birkenstock and a US 9 in Reebok, Keen and Steve Madden. That is the same foot spanning two full sizes depending on whose shoe it is. Rather than memorise a conversion, enter 26 in the calculator above and it will show you every brand at once. As a rough starting point, a men's US size is roughly your foot length in centimeters minus 18, but that approximation breaks down at the edges of the range and between brands.

The usual advice is to subtract 1.5, and for many brands that is right, but not for all, and the exceptions are why it matters. Where a brand publishes a women's chart separate from its men's one, the gap at the same foot length is a full 1 size for Adidas, Chaco, Columbia, New Balance, Nike, Red Wing, Sperry, TOMS and UGG; a full 2 sizes for Birkenstock and Blundstone; and half a size for LOWA. For Danner it is not even a fixed number: the gap shifts across their own size run. So a blanket "subtract 1.5" is wrong for at least 13 of the brands here. For the 16 brands that publish no separate women's chart, this site applies the conventional 1.5 offset to the brand's own measured foot lengths, so treat those women's numbers as a sound convention rather than something the brand printed. Teva publishes men's and women's charts that share no common foot length, so no offset applies at all. Either way, converting through foot length rather than between size numbers is the reliable method, and it is what the calculator does.

By default we round up to the next chart size, since a shoe that is slightly roomy is usually the safer starting point than one that is cramped, though the right amount of room varies by shoe type and by manufacturer. This matters most for kids' shoes, since feet keep growing between purchases. If you'd rather see the closest size instead (up or down), switch "If I'm between sizes" to "Use the closest size" in the calculator.

A common fitting guideline is roughly a thumb's width (very approximately 1 cm) between your longest toe and the end of the shoe, though the right amount varies by shoe type and manufacturer, and a little more for running shoes, since feet swell and slide forward on descents. Be careful not to add that room twice, though: some brands already build it into their published chart and some do not. Altra tells you to add 0.5 cm to your measurement before reading their chart, Mizuno suggests 1 to 1.5 cm, while LOWA states it has already included 15 mm for you. Where a brand gives its own instruction, this site shows it in that brand's fit notes rather than silently folding it into the numbers.

Yes. If you already know your size in one brand, the Brand Converter section lets you enter it and see the equivalent size across every other brand we cover, bridged through foot length rather than just matching size numbers, which don't line up reliably between brands. If you haven't measured your foot yet, the main calculator above does the same thing more directly.

Yes, and more than most people expect. Children's numbering restarts partway through, so a size 1 and a size 13 can be one step apart and a size 4 exists twice. Brands mark that restart differently: ASICS uses a K prefix, Skechers a T, Crocs C and J, Adidas a lowercase k, Nike and Merrell C and Y, and some use no marker at all. 29 of the 35 brands here publish a children's chart we could verify; Brooks has no children's range and uses its own adult-sizing guidance, while the remaining 5 use a standard youth scale that is labeled as such on the result. Select "Children" before calculating, or see the kids' size chart comparing every brand at once.

Every chart is checked against the brand's own published size guide, or against multiple independent retailer transcriptions of it when the brand's page can't be read directly. Even so, a size chart is a starting point, not a guarantee. Fit still varies by shoe model, materials, and width, so treat the result as your best starting size rather than a certainty. The full sourcing and verification process is on the methodology page.

Length and width are two different measurements. New Balance publishes a full numeric width chart (2A narrow through 6E extra-wide), so we match your measured forefoot width directly against their real chart. ASICS, Altra, Birkenstock, Brooks, Clarks, Converse, Danner, Hoka, Merrell, Saucony, Skechers, Sperry and Vans publish their own named width fittings, so we match your measurement to whichever of their real options is closest, anchored on each brand's own standard fitting. The letters do not mean the same thing across brands: a D is the standard men's fitting almost everywhere but Danner's wide women's fitting. For brands that don't publish width data at all, we show a general industry-standard estimate instead, clearly labeled as an estimate rather than a brand-specific figure.

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