Shoe Size Conversion: Charts and Tips for Finding the Right Size
The most reliable way to convert shoe sizes is to measure foot length in centimetres and find the appropriate row in a chart that uses centimetres as its starting point. Converting shoe sizes between the EU, UK, US, AU and JP systems works best when centimetres are at the centre, rather than any national sizing system, which differ from one another more than you might think.
Before opening the calculator, remember three things:
- Men’s, women’s and children’s size scales do not overlap evenly, so always check them separately.
- For comfort, add 0.5 to 1.0 centimetres to the foot length, depending on whether the wearer is an adult or a child.
- Example: a foot measuring 24 centimetres corresponds to approximately EU 38 and a US women’s size of around 7. The charts are a guide, but the manufacturer’s own chart always has the final say.
Key findings
Shoe size conversion is reliable when you use foot length in centimetres as the starting point and brand charts as a supplement, not as the only measurement.
| Point | Details |
|---|---|
| Measure in centimetres | Measure foot length while standing, from the heel to the longest toe, and use the longer of the two feet. |
| Add room for comfort | Add 0.5 to 1.0 centimetres depending on the type of footwear and intended use. |
| Separate the tables by group | Men’s, women’s and children’s size scales do not overlap in the same way, so check them separately. |
| Check the brand separately | The insole’s inner length and the shape of the last vary between manufacturers, even for the same size designation. |
| Choose an adjustable model | Copa-cop offers slippers with a verified inner length and the option to exchange them if a child falls between two sizes. |
Table of contents
- Complete conversion tables for men, women and children
- How to Measure Foot Length Accurately
- Quick conversion formulas and handling half sizes
- Why sizes vary between brands and types of footwear
- How to use the online footwear size converter
- Why the centimeter remains the most reliable reference point
- How to check customer reviews before buying footwear online
- What to do if the footwear does not fit properly
- How Copa-cop approaches choosing the right sizes for children
- Copa-cop makes it easier to choose the right slipper size
- Where else to check size charts and conversion tools
- Frequently asked questions about shoe size conversion
- Sources
Complete conversion tables for men, women and children
The centimetre is the only measurement that does not vary between manufacturers. While EU, UK and US sizes shift slightly from brand to brand, foot length in centimetres remains a physical fact. That is why it makes sense to read a shoe size conversion chart upward from the centimetre column, not the other way around. Larger shoe size converters organise their charts similarly, using centimetres as the reference value from which all other sizes are derived.
Men’s shoe size chart
Women’s shoe size chart
Children’s shoe size chart
A child’s foot grows faster than an adult’s, so the gaps between sizes are smaller, which means errors are more common. Insole-length tables, such as those used by the DZS advice centre, link specific centimetre values to EU sizes—for example, 15.5 centimetres corresponds to EU 26, while 25 centimetres corresponds to EU 41.
For half sizes, a simple guideline applies: if the measurement falls exactly between two rows, choose the larger number for children’s footwear and adjust according to foot width for adults. Children’s feet need some room for toe movement, whereas adult feet do not require the same amount of extra space.
Some practical tips for using these charts:
- Print the chart and keep it with your foot measurement, as a screen is rarely convenient for measuring.
- Always measure both feet, because almost everyone has a difference of a few millimeters between the length of the left and right foot.
- When in doubt between two sizes for adult footwear, choose the larger one; for children’s footwear, also check the insole’s inner length.
- For a printable version with standardized centimeter values, you can also use a PDF foot size chart, which you can keep as a reference for every subsequent purchase.
How to Measure Foot Length Accurately
Measuring at home is surprisingly accurate if you follow a few rules. The process requires no special equipment, just a sheet of paper, a pencil, and a ruler or measuring tape.
- Place the sheet of paper on the floor against the wall, with one edge aligned with the wall.
- Step onto the paper with your heel against the wall, distributing your weight evenly as if you were standing in shoes.
- Mark the point where the longest toe ends; for some people, this is not the big toe but the second toe.
- Measure the distance from the wall to the mark in centimeters.
- Repeat the process for the other foot and use the longer of the two measurements for conversion.
Measuring while standing is not a random detail but a key part of accuracy: the foot spreads and lengthens slightly under body weight, so measuring while seated often gives a smaller value than the actual one.
The comfort allowance is not decoration but functional space. The recommended range is 0.5 to 1.0 centimeters: use the lower value for elegant or close-fitting footwear and the higher value for sneakers or models where the foot needs more room during movement.
Expert advice: Measure children at the end of the day, when their feet are slightly swollen from playing, and stand beside them so they keep their foot naturally flat rather than curled up. The same advice applies to adults, whose feet are noticeably larger in the afternoon than in the morning.
Quick conversion formulas and handling half sizes
For moments when you don’t have the chart at hand, remember a few approximate rules. They are not as precise as the full chart, but they are sufficient for a quick estimate when shopping online.
- A men’s US size is approximately equal to the UK size plus 0.5, so US 9 corresponds to approximately UK 8.5.
- To convert a men’s US size to EU, add approximately 33, so US 9 becomes approximately EU 42.
- Women’s sizes use a different offset, as the difference between US and EU sizes for women’s models is usually around 31 to 32.
- The Japanese (JP) size is essentially a direct measurement in centimeters, rounded to the nearest 0.5 centimeter, making it the most intuitive to read.
In the European system, one half-size corresponds to approximately 4.2 to 6.7 millimeters of sole length, depending on the size range. So if your measurement falls between two whole EU sizes, this practically means that your foot is half a step above the smaller size. For example, a 26.3-centimeter foot falls between EU 41 and EU 42, which generally means choosing EU 42 for athletic shoes, but EU 41 with a thicker sock for dress shoes.
A general rounding rule: when in doubt, choose up for slippers you will wear with socks or while standing for long periods, and down for models where a snugger fit is important, such as dance shoes or lace-up ankle boots.
Why sizes vary between brands and types of footwear
Two pairs of shoes with the same EU 38 label can fit completely differently, and this is not a manufacturing defect but a consequence of different lasts. Sole shape, forefoot width, and inner length vary between manufacturers, sometimes by half a size or more, as also confirmed by comparisons of individual brands. Athletic shoes generally offer more room in the toe area because of cushioning, dress shoes are often narrower and shaped more precisely, while children's footwear must accommodate rapid growth and therefore often includes slightly more internal space.
When reading retailer notes such as “runs small” or “we recommend going up one size,” treat them as an addition to your measurement in centimeters, not as a substitute for it. Some online stores explicitly recommend comparing your foot measurement with the insole's inner length, which is printed or listed in the product description for many models.
For children's slippers, the inner length is an even more important factor than it is for adults. Children's feet grow unevenly, so a model with an insole that is slightly longer than the current measurement provides a few weeks or months of additional comfort before a new size is needed. When choosing between two sizes for a child, it is therefore also helpful to check how to choose slippers for children, which explains specific fit criteria for growing feet.
How to use the online footwear size converter
The online shoe size converter works best when you enter the correct input value rather than just any number you happen to have.
- Enter the measurement in centimeters, not the existing size from old shoes, as it may already differ from the actual length of your foot.
- Select the gender and age category (men, women, or children), since the same centimeter measurement corresponds to a different EU size in different categories.
- Select the target system you want to convert to, such as UK or US, and check the result.
For half sizes, most converters automatically round up, which is the safer choice in nearly all cases except with tightly fitting footwear. The converter's result is always a guideline, since converters calculate the starting value precisely but cannot account for the shape of an individual brand's last.
Before placing your order, also check:
- the manufacturer's own size chart for the specific model, not the brand's general chart,
- ratings and reviews from other customers about the fit of this specific product,
- the return policy and the option to exchange the item if the size turns out to be wrong.
Why the centimeter remains the most reliable reference point
Measuring while standing accounts for the foot spreading under load, so the recommended 0.5-centimeter allowance is not an arbitrary figure but reflects the foot's actual behavior while walking.
This finding explains why charts based on centimeters and insole lengths reduce errors in international shopping more reliably than simple linear formulas between sizing systems. An EU, UK, or US size is merely a label that each manufacturer has defined in its own way, whereas a centimeter describes a physical length that does not change depending on who makes the shoe.
That is why charts should be treated as guidelines, not guarantees. Differences between brands mean it is worth checking the chart for each specific model, especially with children's footwear, where the margin between two sizes is narrow and a child's foot can change enough within a few months to make an old chart useless.
How to check customer reviews before buying footwear online
Fit ratings often tell you more than the size chart itself because they reveal how the model performs in reality, not just on paper. Look for comments that mention a specific size and a specific impression, such as “I ordered a size 42 and it was too tight in the toes,” rather than just general assessments of the product's quality.
Pay attention to recurring patterns. If several customers independently write that a model “runs small” or that you should order one size up, this is not a coincidence but a consistent signal about the shape of the last. You can disregard individual contradictory reviews, but not the pattern.
For children's footwear, parents' reviews are especially useful because they often state the child's age and foot size at the time of purchase, allowing you to compare it with your own situation. Also check whether the seller provides the exact insole length in centimeters, as this is information you can compare directly with your own measurement without guessing between sizing systems.
When reviews are missing or scarce, offset the additional risk when choosing a size by being more cautious when you are between two sizes and checking the return policy before placing your order.
What to do if the footwear does not fit properly
Receiving the wrong size is common and does not mean the measurement was pointless, but rather that the specific model differed from expectations. The first step is always to check the store’s policy before doing anything with the box or product labels.
Most online shops, including those selling children’s footwear, allow exchanges for a different size within a specified period, usually 14 to 30 days from receipt. The footwear should remain unworn or only briefly tried on indoors, while the box and any labels should remain undamaged, as this speeds up the exchange process.
If an exchange is not possible or you want a different model, a refund is another option that most retailers also offer within the same time frame. It is advisable to photograph the product before sending it back, especially with more expensive leather models, where its condition upon return is often checked.
Before ordering a different size again, remeasure the foot, as the original measurement may have been taken while sitting or in the morning, when the foot is smaller than in the late afternoon. This second attempt is often more accurate than the first because you already know where the discrepancy occurred with the specific model.
How Copa-cop approaches choosing the right sizes for children
At Copa-cop, the measurement is not just the label on the box, but the actual internal insole length, which parents can compare with a foot measurement taken at home. Because children’s feet do not grow evenly, we offer the option to exchange the slippers if your child falls between two sizes.
If your child is between sizes, choose a model with a more flexible construction or a slightly longer internal length, as this extends the time before a new size is needed.
Copa-cop makes it easier to choose the right slipper size
Copa-cop offers what tables and converters cannot: a specific model made from natural materials, with an ergonomic and flexible sole that provides comfort even when the measurement falls exactly between two sizes.
For parents looking for a school shoe with a verified internal length, the Formula boys’ textile slippers are designed to give the foot enough room for the entire school day. If you would like to add a personal touch, the personalized embroidered textile slippers combine aesthetics with the same carefully selected construction. For parents looking for a more durable leather version, the Boy‘s flex boys’ leather slippers feature a flexible sole that follows the foot’s natural movement.
Since you know that even the most accurate measurement can occasionally be wrong, Copa-cop offers exchanges or returns and free shipping on orders over €50. Measure the foot by following the steps in this article, compare it with the foot-measuring instructions, and choose a model that adapts to the child’s foot, not the other way around.
Where else to check size charts and conversion tools
Before buying, always check the manufacturer’s own size chart first, and only then use a general converter as an additional check.
- Shoe size converter for quickly comparing different systems.
- PDF foot size chart for printing as a reference.
- Tips for measuring children’s feet before ordering online.
Frequently asked questions about shoe size conversion
How do I convert a shoe size from one system to another? Measure the foot length in centimeters and find the appropriate row in the chart that includes a centimeter column. This is more reliable than converting directly between EU and US sizes, since the relationships between systems vary slightly between brands.
Do I need to allow the same amount of room in children’s slippers as in adults’? Not completely. For children, it is recommended to allow a little extra room because their feet grow quickly, but too much room causes instability when walking. It is therefore better to choose a model with an adjustable inner length than to overcompensate with a larger size.
Why do two shoes with the same EU size fit differently? Manufacturers use different lasts, so the sole shape, width, and inner length vary. It is therefore worth checking the fit notes and the insole’s inner length for the specific model, rather than relying only on the brand’s general size chart.
What should I do if the footwear I ordered does not fit? Check the retailer’s exchange and return policy, leave the footwear unworn and in its original condition, then request an exchange for another size or a refund within the specified period.
How often should I check my child’s foot size? For young children, it makes sense to check the size every two to three months, as their feet grow faster than adults’ feet, and an old measurement can become unusable sooner than expected.
