Shoe Size Conversion
Please provide a shoe or foot size below to convert to the shoe sizes of other countries.
What Is the Shoe Size Conversion Calculator and Why It Matters
A shoe size conversion calculator translates shoe sizes between different international sizing systems — including US, UK, European (EU), and centimeters (CM) or Mondopoint measurements. Because there is no universal shoe sizing standard, the same foot can be labeled with completely different numbers depending on the country of origin, making conversion tools essential for accurate footwear purchases.
The complexity arises because each sizing system uses a different scale, starting point, and increment. US sizes differ from UK sizes by approximately 0.5 to 1 size. European sizes use the Paris point system (each size equals 6.67 mm). The Mondopoint system used in some countries and military applications measures foot length directly in millimeters. Additionally, men's and women's sizes differ within the same country system.
With the growth of international e-commerce, shoe size conversion has become a practical necessity. Ordering shoes from an Italian, British, or Japanese retailer requires reliable conversion, and sizing errors result in costly returns and exchanges. The shoe size conversion calculator eliminates guesswork and reduces the likelihood of ordering the wrong size.
How to Accurately Use the Shoe Size Conversion Calculator for Precise Results
Step-by-Step Guide
- Select the source sizing system: Choose the system your known size uses (US, UK, EU, CM, or Mondopoint).
- Specify gender: Select men's, women's, or children's sizing, as conversion ratios differ by gender and age group.
- Enter your known size: Input your shoe size in the selected system.
- Review all conversions: The calculator displays your equivalent size in every other sizing system simultaneously.
Major Sizing Systems Explained
- US sizing: Separate scales for men, women, and children. Women's sizes are typically 1.5 sizes larger than men's for the same foot length (a men's 8 is approximately a women's 9.5).
- UK sizing: Similar to US but offset by approximately 0.5 size for men. UK women's sizing typically matches UK men's sizing (unlike US).
- EU (European) sizing: Uses the Paris point (6.67 mm per size) and is unisex — the same number applies to both men and women.
- CM/Mondopoint: Measures foot length in centimeters or millimeters. The most objective system, used in Japan and for international standardization.
Tips for Accuracy
- Measure your foot length in centimeters for the most reliable starting point, as this eliminates the variability between sizing systems.
- Measure feet in the afternoon when they are slightly larger from natural swelling throughout the day.
- Different brands may vary by half a size even within the same country system — use conversions as a starting point and check brand-specific size charts.
- Width also varies significantly. Standard width designations (B, D, E, EE) are primarily used in US sizing and may not have direct equivalents in other systems.
Real-World Scenarios and Practical Applications
Scenario 1: Online Shopping from European Retailers
An American man who wears US size 10 wants to order running shoes from a European retailer that uses EU sizing. The conversion calculator shows that US men's 10 corresponds to EU 43. The man also notes that his foot measures 28 cm, which he can verify against the retailer's centimeter-based size chart for added confidence.
Scenario 2: Buying Shoes While Traveling in the UK
An American woman wearing US size 8 is shopping in London and needs to know her UK size. The calculator converts US women's 8 to UK 6. She can now confidently ask shop assistants for her size without confusion. The same foot in EU sizing would be approximately 39.
Scenario 3: Children's International Shoe Shopping
Parents ordering shoes from a Japanese brand for their child who wears US children's size 12 need the centimeter equivalent. The conversion shows 18.1 cm, which corresponds to the Japanese sizing system. Children's feet grow rapidly, so the parents also check the next size up (US 12.5 = 18.4 cm) for room to grow.
Who Benefits Most from the Shoe Size Conversion Calculator
- Online shoppers: Purchase footwear from international retailers with confidence in size selection.
- Travelers: Shop for shoes abroad without sizing confusion or language barriers.
- Retailers and e-commerce businesses: Provide accurate conversion charts for international customers.
- Parents: Convert children's sizes across systems when shopping from various international brands.
- Athletes: Find correct sizes for specialty athletic footwear that may use different sizing standards.
Technical Principles and Mathematical Formulas
Foot Length to EU Size
EU Size = (Foot Length in cm + 1.5) × 1.5
The 1.5 cm addition accounts for the standard toe room (functional allowance).
US Men's Size from Foot Length
US Men's = (Foot Length in inches × 3) − 22
Or approximately: US Men's = (Foot Length in cm − 22) / 0.847
US Women's to US Men's
US Women's = US Men's + 1.5
US Men's to UK Men's
UK Men's = US Men's − 0.5
Common Conversion Reference Table
| US Men's | US Women's | UK | EU | CM |
|---|---|---|---|---|
| 7 | 8.5 | 6.5 | 40 | 25 |
| 8 | 9.5 | 7.5 | 41 | 26 |
| 9 | 10.5 | 8.5 | 42.5 | 27 |
| 10 | 11.5 | 9.5 | 43 | 28 |
| 11 | 12.5 | 10.5 | 44.5 | 29 |
| 12 | 13.5 | 11.5 | 46 | 30 |
Frequently Asked Questions
Why are shoe sizes different in every country?
Each country developed its sizing system independently before global trade made standardization desirable. The US system evolved from English barleycorn measurements, the EU system uses Paris points, and Asian systems often use direct centimeter measurements. No international standard has yet replaced these entrenched national systems.
Is there a universal shoe size?
The closest to a universal system is the Mondopoint standard (ISO 9407), which measures foot length and width in millimeters. It is used by NATO, some Asian countries, and ski boot manufacturers. However, it has not replaced traditional sizing systems in consumer footwear markets.
Do shoe sizes vary between brands?
Yes, significantly. Even within the same sizing system, a size 10 from one brand may fit differently than a size 10 from another. This variation is due to different last shapes (the foot model used to construct the shoe), design philosophies, and manufacturing tolerances. Conversion charts provide a starting point, but individual brand size guides should always be consulted.
How do I measure my foot correctly?
Stand on a piece of paper with your heel against a wall. Mark the longest point of your foot (usually the big toe or second toe). Measure the distance from the wall to the mark in centimeters. Measure both feet and use the larger measurement. Measure in the afternoon for the most representative size, as feet swell slightly during the day.
What does shoe width mean and how is it measured?
Shoe width measures the horizontal dimension across the widest part of the foot. In the US system, widths are designated by letters: A/AA (narrow), B (standard women's), D (standard men's), E/EE (wide), and EEE/EEEE (extra wide). European and Asian sizing systems generally do not include width designations, though some brands offer multiple width options.