Shoe Size from Foot Length
Measure your foot length in cm or inches and get your shoe size across US, UK, EU and Japan.
This maps your measured foot length to the nearest standard published shoe size. Always check the specific brand's own chart before buying — brands cut a given length differently in width and last shape, and foot width isn't captured by length alone.
Starting from your actual foot, not a remembered size
Every shoe-size conversion page on this site makes the same point in different ways: converting a size number between countries is always an approximation, because US, UK, EU, and Japanese sizing were built around genuinely different measuring conventions (barleycorns, Paris points, and literal centimetres, respectively) rather than one shared scale. This tool sidesteps that approximation for the input side by starting from your real foot length instead of a size you're converting from a different system, then mapping that length across all four conventions at once.
Why length is more useful than any single country's size number
A US size, a UK size, and a EU size are all, in their own way, indirect proxies for the same underlying foot length — US and UK sizing derive from an old inch-based unit, EU sizing from centimetre-based Paris points, and only Japanese sizing states the length directly. Working from your measured length rather than converting through one of those coded systems avoids compounding the rounding that happens at each conversion step, which matters more the further apart two systems are.
How to get a length measurement worth using
Stand on a piece of paper against a wall, mark the tip of your longest toe and the back of your heel, and measure the straight-line distance between the marks — do this in the evening rather than first thing in the morning, since feet swell slightly over the course of a normal day and an evening measurement better reflects how a shoe will actually fit during typical wear. Measure both feet, since it's common for one foot to be very slightly longer, and use the larger measurement.
What this tool can't tell you
Foot length is the dominant factor in shoe size, but it isn't the only one — foot width varies independently of length, and brands differ meaningfully in how wide or narrow they cut a given length, something this tool's length-to-size mapping can't capture on its own. The number this tool hands back is a length-based starting point for searching, not a guaranteed match to what a specific style has in stock in your exact half size — check that brand's own chart before finalizing an order it's hard to return.
Built from the same canonical size tables as the rest of the site
The length-to-size mapping behind this tool uses the identical published size-table data that underlies every dedicated shoe conversion and chart page here, so the size it returns for a given length matches what you'd find navigating to the corresponding chart directly — this tool exists to save the step of converting your foot length into a US, UK, or EU size manually before comparing systems.
Frequently asked questions
Why measure foot length instead of just converting my usual size?
Converting a size number always goes through a country-specific coded scale (inches, Paris points, and so on), adding a rounding step each time — measuring your actual foot length and mapping it directly across systems avoids compounding that rounding.
Does this tool use different data than the site's shoe conversion pages?
No — it uses the same canonical size-table data, so the size returned for a given length matches what the corresponding dedicated conversion or chart page shows.
I measured in centimetres but the result looks off — could I have entered the wrong unit?
That's the most common input mistake with this tool — double-check the unit toggle before assuming the conversion itself is wrong, since a centimetre figure entered as inches (or the reverse) produces a confidently wrong but plausible-looking result.
If two different brands' charts disagree slightly for the same measured length, which should I trust?
The brand's own published chart, if it publishes one — brands sometimes round their last shape slightly differently even within the same national system, so this tool's general mapping is the right starting point, but a specific retailer's own stated conversion for its own product takes priority when the two disagree.
Does this tool work the same way for kids' shoe sizes as adult sizes?
The underlying length-to-size logic is the same, but children's growth means a measurement more than a few months old is far more likely to already be outdated than an adult's would be — remeasuring closer to the actual purchase date matters more here than for an adult using this same tool.