| Field | Value | Copy |
|---|---|---|
| {{ r.label }} | {{ r.value }} |
Shoe sizes look like fixed numbers, but they are really different labeling systems wrapped around foot length, shoe length, and retail convention. A foot that measures 26 cm can legitimately appear as JP 26.0, CN 260, UK 7.5, and EU 41.5, and that does not mean the charts disagree. It means the systems start from different units and different fit assumptions.
This converter is built for that gap between measurement and label. You can start from Foot length (cm), Foot length (in), or an existing size in US men, US women, UK, EU, JP, MX, CN, KR, or BR. The result is not just a translated number. It also surfaces Recommended Size, Foot length (cm), Last length (cm), a cross-system comparison, a Toe Room gauge, and warnings when the input looks unusual.
That makes the tool useful when a store shows only one regional chart, when you know a familiar size but need a different market's label, or when you want to see whether rounding and fit allowance are quietly moving the recommendation. The table can be copied or downloaded as CSV, exported to DOCX, and the charts and JSON view can be saved for later comparison.
All routine calculation stays in your browser after the page loads. That helps with privacy, but it does not remove the final retail check. Width, upper shape, sock thickness, and brand-specific lasts still decide whether a translated size will feel right on the foot.
The model here is length first. Current footwear standards treat foot length as the common denominator behind Mondopoint, European, UK, and US size conversion, even though the market labels still differ. European sizing is often discussed in Paris point increments, while the US and UK ladders use larger jumps. This tool normalizes every input into foot length in centimetres, adds a user-selected Fit allowance to derive last length, and then converts that result into the target systems. JP and MX stay tied to foot length in centimetres. CN and KR stay tied to foot length in millimetres. US, UK, EU, and BR are derived from the implied shoe length instead.
The tool's core conversion path is shown below.
Foot length (cm).Last length (cm) for systems that depend on shoe length rather than bare foot length.Recommended Size and the comparison table.| System | Quantity used here | Default step | What changes the result |
|---|---|---|---|
| US Men, US Women, UK | Last length in inches | 0.5 | Fit allowance, Rounding, and US/UK step all matter. |
| EU | Last length in centimetres | 0.5 | Fit allowance, Rounding, and EU step can move the label. |
| BR | EU-derived label | 1 | BR offset shifts the result, so this row is intentionally marked approximate. |
| JP, MX | Foot length in cm | 0.5 cm | These stay tied to the measured foot, not the implied shoe length. |
| CN, KR | Foot length in mm | 5 mm | These are the quickest place to spot a unit mix-up such as 260 cm instead of 260 mm. |
| Signal | Rule used here | Why it matters |
|---|---|---|
Warnings adult-range check |
Appears when Foot length (cm) is below 18 or above 31. |
This is a unit sanity check. It often means the wrong mode was chosen. |
Warnings allowance check |
Appears when Fit allowance is below 0.5 cm or above 2.0 cm. |
The tool still calculates, but the fit assumption is outside its everyday range. |
Toe Room gauge |
The gauge spans 0 to 25 mm and shifts from red to blue to green as room increases. | It shows the extra space implied by the rounded primary size, not just the raw allowance you typed. |
| Chart export status | The Toe Room CSV labels under 8 mm as Tight, 8 to 15 mm as Comfortable, and above 15 mm as Roomy. |
That gives you a quick verbal readout when saving results. |
Width is handled as a note, not a correction factor. The tool keeps a cleaned width code such as D, B, or 2E when it contains only letters and digits, then shows it in the summary table. It never changes the conversion math.
When you can, start from a real foot measurement rather than an old shoe label. Measure while standing, use the longer foot if they differ, and keep your heel against a wall or baseboard so the length is honest. Late-day measurements and the socks you normally wear give a better buying reference than a quick barefoot guess taken first thing in the morning.
The standard path is simple: enter Foot length (cm), leave Fit allowance at 1.5 cm, and keep Rounding on Nearest. That gives you a neutral starting point for everyday footwear. If you want a closer feel, lower the allowance or choose Floor. If you are planning for thicker socks, swelling, or a roomier boot fit, raise the allowance or choose Ceil. The point is not to hunt for the biggest or smallest label. The point is to match the intended space inside the shoe.
EU or CN (mm) when you are translating a chart, then check whether the derived Foot length (cm) still matches your own measurement.Toe Room before trusting Recommended Size. A familiar label can still be too tight if the rounded result leaves very little extra length.Advanced only when the retailer's chart uses unusual steps, skips half sizes, or needs a custom BR offset.2E or B, but it does not reshape the converter's length model.The best use of this tool is as a cross-check, not a substitute for the seller's own chart. If the converted label and the retailer's foot-length table point to the same size, confidence improves. If they disagree, trust the measurement and inspect the product chart before ordering.
Mode. Use a foot-length mode when you measured your foot. Use a regional size mode only when you are translating a known label.Value and confirm the unit suffix beside the input. Numbers such as 260 or 265 usually belong in CN (mm) or KR (mm), not in centimetres.Gender if you want the headline recommendation to default to US men or US women when you start from a foot measurement.Fit allowance preset or enter your own value. Watch how Last length (cm) and Toe Room respond.Size Summary first, then open Across Systems and Step Sizes if you need to compare labels or understand how coarse each size ladder is.Warnings appears, resolve that before using the result. Most bad outputs come from the wrong mode, the wrong unit, or an unrealistic allowance.Recommended Size is the primary label for the active path, not a universal truth across brands. If you entered EU, the headline stays in EU. If you entered a foot measurement, the headline defaults to US men or US women according to the selected gender. The full table still shows every supported system either way.
Foot length (cm) is the anchor row. If that number does not match your real measurement, stop there. A familiar US or EU size is not enough to rescue a bad input. Last length (cm) is the internal space implied by the chosen allowance. The gap between those two rows explains why the same foot can land on different shelf labels when you switch from a snug fit to a roomy fit.
Across Systems compares nominal labels for US, UK, EU, and BR against foot-length-based values for JP, MX, CN, and KR. The chart is useful for orientation, but the bars are not all the same unit.Toe Room is based on the rounded primary recommendation. If rounding nudges a size up or down, the effective toe room changes with it.Step Sizes converts each system's increment into millimetres. A bigger step means bigger jumps between available labels and less precision around the boundary.JSON stores the same inputs, derived lengths, raw sizes, rounded sizes, display labels, and warnings shown elsewhere in the tool.BR deserves extra caution. The tool exposes BR (approx.) because the result is derived from EU sizing plus BR offset, and real retailer charts can differ. Use that row as a practical translation aid, then compare it with the brand's own BR table before you buy.
A measured foot with an everyday allowance. Enter 26.0 in Foot length (cm), keep Fit allowance at 1.5 cm, and leave Rounding on Nearest. The tool resolves to Recommended Size US M 8.5, with Last length (cm) 27.50. The comparison rows show UK 7.5, EU 41.5, BR 39, JP 26, MX 26, and CN and KR 260 mm. Toe Room lands a little above 15 mm, which is a solid everyday baseline rather than a tight performance fit.
Pushing the fit too close. Keep the same 26.0 cm foot but drop Fit allowance to 0.4 cm and change Rounding to Floor. Now Recommended Size falls to US M 7, while UK drops to 6 and EU to 39.5. The gauge shrinks to about 2.5 mm of toe room and Warnings flags the allowance as unusual. That is a clear sign that the result may match a number you want to see, but not the space most people want to wear.
Starting from a store label instead of a measurement. Set Mode to EU and enter 42 with the standard allowance. The headline stays at Recommended Size EU 42, but the useful part is the back-solved measurement: Foot length (cm) becomes 26.50. The rest of the table translates that to US M 9, US W 10, UK 8, JP and MX 26.5, and CN and KR 265 mm. This is the right path when a retailer shows only EU sizing and you want to know what foot length that label implies.
Fixing a unit mistake before it becomes a bad order. If you enter 260 while Mode is still Foot length (cm), the output explodes into impossible sizes and Warnings says the foot length is outside a typical adult range. Change the same value to CN (mm) and the tool immediately reinterprets it as Foot length (cm) 26.00, bringing Recommended Size back to US M 8.5 and the gauge back to about 15 mm of toe room. When the result looks absurd, the first thing to check is the unit mode.
No. It gives a consistent length-based translation, which is useful, but it cannot see the brand's last shape, upper volume, or break-in behavior. Use the result to narrow the choice, then compare it with the retailer's own chart for that model.
Those rows are tied directly to foot length in this tool. Fit allowance mainly changes the systems that are derived from last length, which is why US, UK, EU, and BR react more strongly.
It changes which US label is promoted as Recommended Size when you start from a foot measurement and keeps the labeling aligned with US men or US women. The table still calculates and shows both US rows either way.
Toe Room not always equal the allowance I entered?The gauge reflects the rounded primary size, not just the raw allowance. If the chosen size rounds up or down, the implied last length moves with it, and the effective toe room can gain or lose a few millimetres.
The tool keeps only letters and digits after trimming spaces. That means D, B, and 2E survive, while punctuation or other characters are dropped. Even a valid width code remains a note and does not alter the length conversion.
Routine calculation, charts, CSV output, DOCX export, and the JSON summary are all generated locally after the page loads. There is no extra server-side sizing step hidden behind the results.