Shoe Size Converter
Convert between US, UK, EU shoe sizes
How to Use This Converter
This shoe size converter makes it easy to find your correct size across different international sizing systems. Start by selecting your gender category (men, women, or children), as each uses different conversion scales. Choose the sizing system you already know from the dropdown menu, whether that is US, UK, EU, or your foot length in centimeters.
Enter your known size in the input field. Half sizes are supported, so you can enter values like 9.5 or 10.5 for precise conversions. Click the Convert button to instantly see your equivalent sizes in all four measurement systems. The results display your US, UK, European, and centimeter measurements simultaneously.
For the most accurate results, measure your foot using the steps outlined below. If you are between sizes, the converter shows the closest match. Remember that these are approximate conversions, and you should always consult brand-specific size charts when available, as sizing can vary between manufacturers.
Understanding Shoe Sizes
Shoe sizing systems developed independently across different regions, creating the complex landscape of measurements we navigate today. Understanding how each system works helps you make informed decisions when shopping internationally or ordering shoes online.
The US Sizing System
The American shoe sizing system evolved from the British barleycorn system but uses different starting points for its measurements. US sizes run numerically larger than UK sizes for the same foot length. Men's and women's sizes operate on separate scales, with women's sizes typically running about 1.5 numbers higher than men's for equivalent foot lengths. The system includes half-size increments and width designations ranging from narrow (N or AA) to extra wide (EE or 4E), providing numerous fit options.
The UK Sizing System
British shoe sizing has remained remarkably consistent since King Edward II standardized it in 1324 using the barleycorn (one-third of an inch) as the base unit. Each full UK size represents approximately 8.46 millimeters of foot length. UK sizes run smaller numerically than US sizes, and like the American system, men's and women's sizes use different scales. The UK system serves as the foundation for shoe sizing throughout the Commonwealth nations, including Australia, New Zealand, and India.
The European (EU) Sizing System
European sizing uses the Paris Point system, where each size represents two-thirds of a centimeter (approximately 6.67 millimeters). This creates the larger numerical values you see in EU sizes, such as 42 or 44. One significant advantage of European sizing is that it is unisex, meaning a foot of the same length will wear the same EU size regardless of gender. This simplicity makes EU sizes increasingly popular as a universal reference point.
The Centimeter (Mondopoint) System
Japan, China, Korea, and several other Asian countries use shoe sizing based directly on foot length in centimeters. This straightforward approach eliminates conversion confusion: a 27-centimeter foot simply requires a size 27 shoe. The centimeter system is the most logical and precise method because it directly corresponds to physical foot measurements rather than arbitrary numbered scales.
Why Sizes Vary by Brand
Despite these standardized systems, no universal enforcement exists for exact shoe dimensions. Each manufacturer creates proprietary lasts (the foot-shaped molds used in production) and interprets size charts according to their design philosophy. Italian brands often run narrow, while American athletic brands tend toward roomier fits. Always consult brand-specific sizing guides and read customer reviews mentioning fit when ordering unfamiliar brands.
Width Considerations
Length is only half the equation for proper shoe fit. Width varies significantly among individuals, and many brands offer multiple width options. Standard width is typically labeled D for men and B for women. Narrow options include B or N for men and AA or N for women, while wide options range from E to EEEE (4E). If you consistently experience tightness across the ball of your foot or your feet hang over the sole edges, consider trying a wider width rather than sizing up in length.
Frequently Asked Questions
How can I measure my foot at home?
To measure your foot at home, place a piece of paper on a hard floor against a wall. Stand on the paper with your heel touching the wall, distributing your weight evenly. Have someone mark the tip of your longest toe (which may be your second toe, not your big toe). Measure the distance from the wall to the mark in centimeters. Repeat for both feet and use the larger measurement. Wear the type of socks you typically wear with shoes, and measure in the afternoon when your feet are naturally at their largest.
Why do my shoe sizes vary between different brands?
Shoe sizes vary between brands because there is no universal standard that manufacturers must follow. Each brand designs their own lasts (shoe molds) based on their target customers, manufacturing processes, and design aesthetics. A European brand designing sleek dress shoes will have different proportions than an American brand creating athletic footwear. Additionally, shoes manufactured in different countries may use slightly different interpretations of sizing standards. This is why reading customer reviews about fit and consulting brand-specific size charts is essential when trying a new brand.
What should I do if I have wide or narrow feet?
If you have wide feet, look for brands known for generous fits or those offering explicit wide width options (E, EE, or EEE for men; D, E, or EE for women). Avoid sizing up in length to compensate for width, as this creates other fit problems. For narrow feet, seek brands offering narrow widths (B for men, AA or N for women) or look for styles with lacing systems that allow secure tightening. Some shoe types, like loafers, naturally accommodate certain foot shapes better than others.
How do UK and US shoe sizes compare?
For men's shoes, US sizes are approximately 0.5 to 1 size larger than UK sizes. A US men's 10 equals roughly UK 9 or 9.5. For women's shoes, the difference is greater: US sizes run about 2 full sizes larger than UK sizes, so a US women's 8 equals approximately UK 6. These differences exist because each country's system uses different starting points and baseline measurements, even though both derive from the same historical barleycorn unit.
How do children's shoe sizes work?
Children's shoe sizing can be particularly confusing because kids' feet grow rapidly through multiple size ranges. In the US, children's sizes typically run from 0 to 13, then reset to 1 when transitioning to youth or adult sizing. UK children's sizes follow a similar pattern. EU children's sizes are continuous and directly comparable to adult sizes, simply using smaller numbers. Children should have their feet measured frequently, approximately every two to three months, as they may grow through multiple sizes per year. Allow about a thumb's width of growing room in children's shoes.
How can I shop for shoes online successfully?
Successful online shoe shopping requires preparation. First, measure both feet using the home measurement method and record the results in centimeters. Check the specific brand's size chart, as these often include centimeter-to-size conversions. Read customer reviews focusing on fit comments, watching for patterns like "runs small" or "wide fit." Order from retailers with free returns or exchange policies. When your shoes arrive, try them on in the afternoon with appropriate socks, walk around on carpet (to keep soles clean for potential return), and check for proper toe room and heel security.
Can shoes be stretched if they are too tight?
Leather and suede shoes can often be stretched slightly using professional stretching services or home stretching tools. Shoe repair shops can stretch shoes by about a half size in length or width. Home methods include using shoe stretchers (adjustable devices inserted into shoes), wearing thick socks with the shoes while using a hairdryer to warm the material, or using commercial stretching sprays. However, synthetic materials and heavily structured shoes resist stretching. Shoes that are significantly too small cannot be safely stretched enough to fit properly and should be exchanged.
What are half sizes and do I need them?
Half sizes provide fit options between whole sizes, representing approximately 4 millimeters (about 1/6 inch) of additional length. Not all brands or styles offer half sizes, particularly in European sizing where half sizes are less common. If you fall between sizes, half sizes provide a better fit than sizing up or down by a full size. Many people find half sizes essential for achieving optimal comfort, especially in athletic footwear where precise fit affects performance. If half sizes are unavailable, sizing up and using an insole to take up extra space is generally preferable to wearing shoes that are too short.
Shoe Size Examples
Converting US to EU Sizes
Sarah wears US women's size 8 and wants to order boots from a European retailer. Using the converter, she enters her US size and finds her EU equivalent is approximately 38.5 to 39. She checks the brand's specific size chart and finds their EU 39 corresponds to a 25-centimeter foot length. Measuring her foot at 25.2 centimeters, she orders the EU 39 with confidence.
Finding Your International Equivalent
James is traveling to the UK and wants to buy dress shoes. He normally wears US men's size 10.5. Using the converter, he learns his UK equivalent is approximately 10 or 9.5, depending on the brand. He also notes his EU size of 44 for shopping in continental Europe and his foot length of 28.5 centimeters for Asian brands. Having all these measurements ready makes international shopping straightforward.
Converting Children's Sizes
A parent needs to order school shoes online for their child who wears US kids' size 2. The converter shows this equals approximately UK 1, EU 33, and a foot length of 21 centimeters. Because children's feet grow quickly, they order a size up (US 2.5, EU 34) to allow for several months of growth room while ensuring the shoes are not so large they cause tripping.
Shoe Fitting Tips
Measure both feet: Most people have feet of slightly different sizes, sometimes varying by as much as a full size. Always fit shoes to your larger foot. You can use an insole or heel pad in the shoe for your smaller foot if needed.
Shop in the afternoon: Feet naturally swell throughout the day due to walking and standing. They can be up to half a size larger in the evening compared to morning. Shopping later in the day ensures your shoes will fit comfortably all day long, not just when you first wake up.
Check for thumb-width room: When standing, there should be approximately one thumb's width (about 1 to 1.5 centimeters) between your longest toe and the end of the shoe. This space accommodates natural foot movement and prevents toe injuries. For athletic shoes and hiking boots, slightly more room helps during high-activity movements.
Consider the break-in period: Quality leather shoes typically require a break-in period of several wears before reaching optimal comfort. However, shoes should never cause pain or significant discomfort even when new. If shoes pinch, rub painfully, or cause numbness, they are too small or the wrong shape for your feet. Synthetic materials generally do not stretch or break in like leather, so they should fit comfortably from the first wear.
Walk around before deciding: Take time to walk on different surfaces when trying shoes. Stand on your toes, walk up and down stairs if possible, and move as you would in daily life. Shoes that feel acceptable standing still may reveal fit problems during movement. Your heel should stay securely in place without slipping, and the widest part of your foot should align with the widest part of the shoe.
How to measure your foot
Accurate foot measurement is the foundation of finding well-fitting shoes. Follow these steps for the most precise measurement:
- Stand on a piece of paper placed on a hard floor, with your heel against a wall
- Wearing the type of socks you plan to wear with the shoes, put your full weight on both feet
- Have someone mark the longest point of your foot (usually the big toe or second toe)
- Measure from the wall to the mark in centimeters
- Measure both feet and use the larger measurement, as most people have one foot slightly larger than the other
Measure your feet in the afternoon or evening, when they have naturally expanded from the day's activity. Feet can be as much as half a size larger at the end of the day compared to morning measurements.
Size chart notes
- Sizes vary by brand: These are approximate conversions; actual fit depends on the manufacturer
- Try before buying: When possible, always try shoes on before purchasing
- Measure in afternoon: Feet swell throughout the day, so measure later for accurate sizing
- Width matters: Some brands run narrow or wide; consider width if standard sizes do not fit well
- Athletic versus dress shoes: Athletic shoes often fit differently than dress shoes in the same marked size
Approximate conversion formulas
Men's conversions:
- US to UK: subtract 0.5 to 1
- US to EU: add 33
- CM to US: (CM - 22) / 0.847 + 3
Women's conversions:
- US to UK: subtract 2
- US to EU: add 31
- CM to US: (CM - 21) / 0.847 + 3
Note: These formulas provide estimates. Actual conversions vary by brand and shoe style.
Did you know?
- The modern shoe sizing system dates to 1324 when King Edward II declared the barleycorn (one-third of an inch) as the base unit for measuring feet.
- The average American man wears size 10.5 and the average woman wears size 8.5, both having increased a full size since the 1970s due to changes in nutrition and health.
- Left and right feet are usually different sizes, sometimes by as much as a full size. You should always fit shoes to your larger foot.
- Professional basketball player Shaquille O'Neal wears size 22 shoes, while the largest shoe ever made was size 37 for Robert Wadlow, the tallest person in recorded history.
- The European Paris Point system, still used today, was developed in the early 19th century and remains one of the most logical sizing systems because it directly relates to foot length.