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Shoe Size Converter

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Note
Shoe sizes are approximate and vary by manufacturer. Always consult the specific brand size chart when possible.

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About This Tool

Shoe Size Converter: Convert Between International Sizing Systems

The Shoe Size Converter is a free online tool that instantly converts shoe sizes between six major international sizing systems: US Men's, US Women's, UK, EU (European), Japan, and Mondopoint. Whether you are shopping for shoes from an overseas retailer, comparing size charts across different brands, or trying to determine your size in an unfamiliar system, this converter provides quick and reliable approximate conversions with the corresponding foot length measurement.

All conversions are performed entirely on the client side using foot length in centimeters as the normalized base measurement. Enter a shoe size in any supported system and the tool instantly calculates the equivalent in all other systems, along with the approximate foot length. Enable the "Show all sizing systems" option to view a complete reference table grouped by region.

Supported Sizing Systems

The converter covers six sizing systems that represent the most widely used standards across North America, Europe, Asia, and international industrial applications.

US Sizing (Men's and Women's)

  • US Men's Sizes — The standard sizing system for men's footwear in the United States. US Men's sizes typically range from 6 to 16, with half sizes available. The system is based on the Brannock Device measurement, invented in 1927, which measures both foot length and width. A US Men's size 9 corresponds to a foot length of approximately 26.2 centimeters. The scale increases by roughly 8.5 millimeters per full size.
  • US Women's Sizes — Uses the same underlying measurement scale as US Men's but with a different offset. US Women's sizes run approximately 1.5 numbers higher than the equivalent Men's size. For example, a US Women's 10.5 is roughly the same foot length as a US Men's 9. This offset exists because the women's scale starts at a smaller foot length while using the same size-number progression.

UK Sizing

  • UK Sizes — The British sizing system is one of the oldest standardized shoe sizing methods, dating back to the 14th century. It uses barleycorn units, where each full size equals one- third of an inch (approximately 8.47 millimeters). UK sizes are generally one number below the equivalent US Men's size. For example, a US Men's 10 is approximately a UK 9. The UK system is used throughout the United Kingdom, Ireland, and many Commonwealth nations including Australia and New Zealand, though some of these countries also recognize other systems.

EU (European) Sizing

  • EU Sizes (Paris Point System) — The European Continental sizing system measures shoe length in Paris Points, where each size increment equals exactly two-thirds of a centimeter (6.67 millimeters). The formula is: EU size equals foot length in centimeters multiplied by 1.5, plus 2 (for the toe allowance). EU sizing is unisex, meaning the same size number applies to both men and women with the same foot length. Common adult EU sizes range from approximately 36 to 48. This system is used across continental Europe and has become the most widely recognized international sizing standard alongside the US system.

Japan and Mondopoint

  • Japan (cm-based) — The Japanese sizing system is remarkably straightforward: the shoe size number directly represents the foot length in centimeters. A size 27 shoe is designed for a 27- centimeter foot. This system is used in Japan and is one of the most intuitive sizing methods because it requires no conversion formula to understand the underlying measurement. Japanese sizes are commonly listed in 0.5 cm increments.
  • Mondopoint (mm-based) — An international standard defined by ISO 9407, Mondopoint expresses shoe size as foot length in millimeters. A Mondopoint size of 270 means the shoe fits a 270 mm (27.0 cm) foot. Mondopoint is the most precise and unambiguous sizing system because it directly maps to a physical measurement with no conversion needed. It is widely used for military footwear, ski boots, safety shoes, and professional athletic equipment where precise fit is critical. Many international organizations and defense forces have adopted Mondopoint as their standard.

How Shoe Size Conversion Works

Every conversion is normalized through foot length in centimeters in two steps. First, the input shoe size is converted to its equivalent foot length using the source system formula. Then that foot length is converted to the target sizing system using the target formula. This two-step approach ensures consistent results across every possible pair of sizing systems.

As an example, converting US Men's 10 to EU sizing:

  • US Men's 10 converts to foot length: (10 + 22) / 1.181 equals approximately 27.1 cm.
  • 27.1 cm converts to EU: (27.1 times 1.5) + 2 equals approximately EU 42.7, which rounds to EU 43.

Results are rounded to the nearest half-size for systems that use half-size increments (US, UK), or to the appropriate step for other systems. This rounding reflects real-world availability since shoes are manufactured in discrete sizes rather than on a continuous scale.

Common Size Equivalents Reference

  • US Men 7 = US Women 8.5 = UK 6 = EU 40 = JP 25 cm = MP 250
  • US Men 8 = US Women 9.5 = UK 7 = EU 41 = JP 26 cm = MP 260
  • US Men 9 = US Women 10.5 = UK 8 = EU 42.5 = JP 27 cm = MP 270
  • US Men 10 = US Women 11.5 = UK 9 = EU 43.5 = JP 28 cm = MP 280
  • US Men 11 = US Women 12.5 = UK 10 = EU 45 = JP 29 cm = MP 290
  • US Men 12 = US Women 13.5 = UK 11 = EU 46 = JP 30 cm = MP 300

Important Considerations for Shoe Sizing

  • Manufacturer Variation: There is no universal enforcement of sizing standards, and different brands interpret size numbers differently. A size 42 from one European brand may fit differently than a 42 from another. Athletic shoe brands, dress shoe makers, and casual footwear companies often use slightly different lasts and internal measurements for the same labeled size.
  • Width Differences: This converter focuses on length- based sizing. Shoe width is a separate measurement that varies independently from length. Common width designations include Narrow (B for men, AA for women), Standard (D for men, B for women), and Wide (E or EE for men, D for women). Some systems like Mondopoint include width as a separate number.
  • Foot Measurement Tips: For the most accurate size determination, measure your foot in the afternoon when feet are slightly swollen from activity. Stand with full weight on the foot being measured. Measure from the heel to the tip of the longest toe, which is not always the big toe. Always measure both feet and use the larger measurement, as most people have one foot slightly larger than the other.
  • Toe Room Allowance: Most properly fitted shoes include additional space beyond the foot length, typically 10 to 15 millimeters, to allow for toe movement. The conversion formulas used in this tool account for standard toe allowance, but individual comfort preferences and shoe styles may require slight adjustments.
  • Children's Sizing: Children's shoe sizes use different scales than adult sizes in most systems. This converter focuses on adult sizing. For children, consult the specific brand chart and measure the child foot frequently, as children feet grow rapidly and may change size every few months.

Tips for Using the Shoe Size Converter

  • Enable "Show all sizing systems" to see your size in every supported system at once. This is especially useful when shopping internationally or comparing products from brands that use different regional sizing.
  • Pay attention to the foot length measurement displayed alongside the conversion. If you know your exact foot length in centimeters from measuring at home, you can enter it as a Japan size (which uses centimeters directly) and convert to all other systems for the most accurate starting point.
  • Use the Swap button to quickly verify conversions in both directions. If you found a shoe listed as EU 44 and want to know the US equivalent, and then want to double-check by converting back, the swap feature makes this effortless.
  • When in doubt between two sizes, most shoe fitting experts recommend choosing the larger size. It is easier to add an insole or adjust lacing for a slightly larger shoe than to stretch a shoe that is too small. This is especially true for athletic and hiking footwear where feet swell during activity.

Frequently Asked Questions

Is the Shoe Size Converter free?

Yes, Shoe Size Converter is totally free :)

Can I use the Shoe Size Converter offline?

Yes, you can install the webapp as PWA.

Is it safe to use Shoe Size Converter?

Yes, any data related to Shoe Size Converter only stored in your browser (if storage required). You can simply clear browser cache to clear all the stored data. We do not store any data on server.

What shoe sizing systems does this converter support?

The Shoe Size Converter supports six sizing systems: US Men's, US Women's, UK, EU (European/Paris Point), Japan (centimeter-based), and Mondopoint (millimeter-based). All conversions normalize through foot length in centimeters for consistent results across every system pair.

How accurate are these shoe size conversions?

The conversions use widely accepted approximate formulas that provide a reliable starting point for finding your size in a different system. However, actual shoe fit varies by manufacturer, shoe style, last shape, and materials. These conversions should be treated as guidelines rather than exact matches. Always try on shoes when possible or consult the specific brand's size chart.

What is the difference between US Men's and US Women's sizing?

US Women's sizes are approximately 1.5 sizes larger in number than US Men's for the same foot length. For example, a US Men's 9 is roughly equivalent to a US Women's 10.5. Both systems use the same underlying scale but with different starting offsets. The converter handles this automatically when you switch between the two systems.

What is the Mondopoint sizing system?

Mondopoint is an international sizing standard (ISO 9407) that measures foot length in millimeters. It is the most precise sizing system because it directly represents the physical foot measurement. Mondopoint is commonly used for military footwear, ski boots, and safety shoes. A Mondopoint size of 270 means the shoe is designed for a foot that is 270 mm (27.0 cm) long.

How does EU shoe sizing work?

European shoe sizes use the Paris Point system, where each size increment equals 6.67 millimeters (two-thirds of a centimeter). The formula is: EU size = (foot length in cm multiplied by 1.5) + 2. EU sizing is unisex, meaning the same number applies to both men and women for the same foot length. Common adult sizes range from about 36 to 48.

How can I measure my foot length accurately?

Stand on a piece of paper with your heel against a wall. Mark the tip of your longest toe on the paper. Measure from the edge of the paper at the wall to the mark in centimeters. Measure both feet and use the larger measurement. It is best to measure in the afternoon when feet are slightly larger from walking. Wear the type of socks you plan to use with the shoes.