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Shoe Size Conversion

Use this Shoe Size Conversion tool to convert between US, UK, EU, and Japan/CM systems for men, women, and kids. Because brands and lasts vary, treat results as approximations.

Tip: If you choose Japan/CM, enter your foot length in centimeters. For half sizes, use decimals (e.g., 9.5).

Note: Conversions are rounded to typical retail increments (0.5 for US/UK, 0.5 for EU where applicable, and 0.5 cm for JP/CM). Always try on shoes when possible.

Shoe Size Conversion Calculator: Convert US, UK, EU, and CM

Finding the right shoe size across different regions can be confusing. Our Shoe Size Conversion calculator makes it simple to convert between US, UK, EU, and Japan/CM systems for men, women, and kids—so you get a reliable starting size before you buy.

Why shoe sizes differ by region

Footwear is produced for global markets, but sizing systems developed independently. The US and UK systems are based on different historical lasts, EU sizing typically follows the Paris point scale, and Japan uses centimeters (often referred to as Mondopoint). As a result, a US men’s 9 doesn’t match a UK 9 or an EU 42 without conversion. Our calculator bridges these systems so you can shop confidently across brands and countries.

How the Shoe Size Conversion calculator works

Enter your known size, select the “from” and “to” regions, choose the gender or age group, and submit. The tool applies common industry conversion relationships to estimate the target size. For Japan/CM, enter your foot length in centimeters. The output is rounded to typical retail increments for easier selection.

Supported size systems

  • US: United States (men, women, youth)
  • UK: United Kingdom (men, women, youth)
  • EU: European sizing
  • JP/CM: Japan and centimeter-based lengths

Typical conversion relationships

While brands vary, the following guidelines are widely used:

  • Men: UK = US ? 1; EU ? US + 33; JP/CM ? US + 18
  • Women: UK = US ? 2; EU ? US + 31; JP/CM ? US + 17
  • Kids/Youth: UK ? US ? 0.5; EU ? US + 32; JP/CM ? US + 18.5

These align closely with common retail charts and provide a practical estimate for most shoppers.

Measuring your foot for best results

  1. Place a sheet of paper on a hard floor against a wall.
  2. Stand with your heel against the wall and mark your longest toe.
  3. Measure the distance from the wall to the mark in centimeters.
  4. Use the calculator with JP/CM as your “from” size to convert to US, UK, or EU.

Measure both feet and use the larger measurement. If you stand or walk a lot, consider a small size increase for comfort.

Understanding width and brand differences

Length conversion is only part of fit. Width (e.g., D, E, EE for men; B, D for women) and last shape differ by brand and model. Even within a brand, performance vs. lifestyle shoes can fit differently. Use our conversion as your baseline, then check brand-specific fit guides when available.

Tips for buying shoes online

  • Check the brand’s size chart for the exact model.
  • Read reviews for notes on fit (runs large/small, narrow/wide).
  • Consider half-size adjustments if you wear thick socks or prefer more room.
  • Look for flexible return policies to try multiple sizes.

Common examples

  • Men: US 9 ? UK 8 ? EU 42 ? JP/CM 27
  • Women: US 8 ? UK 6 ? EU 39 ? JP/CM 25
  • Kids/Youth: US 4Y ? UK 3.5 ? EU 36 ? JP/CM 22.5

Remember: these are approximations. Depending on the brand’s last and materials, you may need a different half size.

Bottom line

The Shoe Size Conversion calculator gives you a quick, practical translation across US, UK, EU, and CM systems for men, women, and kids. Use it to narrow your choices, then fine-tune using brand guidance and real-world try-ons whenever possible.

FAQs

How accurate is the Shoe Size Conversion calculator?

It provides widely used approximations. Brand lasts vary, so use it as a starting point and check brand fit guides.

Can the Shoe Size Conversion calculator convert from CM to US or EU?

Yes. Select Japan/CM as the source, enter your foot length in centimeters, and choose US, UK, or EU as the target.

Does the Shoe Size Conversion calculator handle men, women, and kids?

Yes. Choose Men, Women, or Kids/Youth to apply the appropriate conversion relationships.

Why do my results from the Shoe Size Conversion calculator differ from a brand chart?

Brands use different lasts and rounding. Our tool uses common industry rules; brand charts may refine them.

What increments does the Shoe Size Conversion calculator use?

US/UK sizes round to the nearest 0.5, EU often to 0.5, and Japan/CM to 0.5 cm for practical selection.

Can I use the Shoe Size Conversion calculator for wide or narrow feet?

The calculator converts length only. Check brand width options (e.g., D, E, EE) for the best fit.

Does the Shoe Size Conversion calculator support half sizes?

Yes. Enter half sizes like 9.5 and the result will round to typical retail increments.

Is the Shoe Size Conversion calculator suitable for online shopping?

Yes. Use it to pick a starting size, then verify with brand charts and reviews before ordering.