Shoe Size Converter

Shoe Size Converter

Convert between US, European (EU), UK, and centimeter (CM) shoe sizing systems for men, women, and children. Whether you are buying on an international retailer’s website, ordering from a European brand, or checking a Japanese sizing chart, this converter shows your equivalent size in every system instantly — so you order the right size the first time.

How Shoe Size Conversion Works

Each sizing system uses a different base unit and starting offset. EU sizes follow the Paris point system, where one Paris point = 2/3 of a centimeter. The formula is: EU size = foot length in cm x 1.5 + 1.5. US sizes are based on 1/3-inch increments from a fixed starting barleycorn (a historical unit of 1/3 inch). Men’s US sizes start from a different offset than women’s, which is why a women’s US 8 and a men’s US 6.5 correspond to the same foot length. UK sizes run approximately 1 size lower than US men’s. CM (Mondopoint) is simply the foot length in centimeters, used primarily in Japan, Korea, and military procurement.

Worked Examples

Scenario 1 — Buying Nike shoes from a US site (European shopper) A shopper in Germany wears EU 42 men’s. US men’s equivalent is US 9. She verifies on Nike’s own size chart: EU 42 = US 9 = UK 8 = 27 cm. She selects US 9 and the shoes arrive fitting perfectly.

Scenario 2 — Buying Italian leather shoes in women’s sizing A US women’s size 8 buyer finds an Italian brand that lists only EU sizes. US Women’s 8 = EU 38-39. The brand’s fit notes say “runs narrow, size up.” She orders EU 39 (US 8.5) and gets the correct fit.

Scenario 3 — Children’s shoe shopping for a growing toddler A parent’s child measured at 16.5 cm foot length. In EU children’s sizing: 16.5 cm x 1.5 + 1.5 = 26.25, rounding to EU 26. In US kids sizing that is approximately US 9 Toddler (9T). The parent notes the child is between sizes and orders EU 27 for growing room.

Men’s Size Conversion Chart

Women’s Size Conversion Chart

When to Use This Tool

• Shopping on a US, UK, or EU retailer website that only lists sizes in one regional system
• Buying shoes as a gift for someone whose size you know in one system but the product lists another
• Ordering children’s shoes where foot grows quickly and you want to buy one size up based on a current CM measurement
• Comparing athletic shoes across brands that use different sizing conventions (e.g., Adidas EU sizing vs. Nike US sizing)
• Confirming your size before purchasing from a brand with no return shipping to your country

Common Mistakes

1. Assuming US men’s and US women’s sizes use the same scale. They do not — a women’s US 8 corresponds to the same foot length as a men’s US 6.5. When buying unisex or men’s shoes as a woman, subtract 1.5 from your women’s size to get the men’s equivalent.
2. Treating EU sizes as exact when they span half-sizes. A US men’s 10 maps to approximately EU 43, but some brands label it 43 and others label it 44. Always check the CM foot length measurement against the specific brand’s chart to resolve ambiguity.
3. Ignoring width sizing when converting. International size conversion covers length only. A UK 9 in a narrow (C) width is not the same fit as a UK 9 in a standard (E) or wide (G) width. Width conventions vary significantly between US, UK, and European brands.
4. Using shoe size instead of foot length for children. Children’s feet grow about one full size every 3-4 months. Measuring the actual foot in centimeters and converting to size is more reliable than going by a previous purchase.

Context and Applications

Shoe size conversion is a practical need driven by international e-commerce. In online retail, a US consumer buying from a UK brand or a German consumer buying from a US brand faces different size scales with no physical try-on option. Getting the conversion wrong means return shipping, restocking fees, and delays. In professional sports and fitness, athletes ordering footwear from international sponsors or technical suppliers need exact size matches since performance footwear fit is critical. In children’s footwear, pediatricians in many countries recommend measuring foot length in cm and converting to size rather than relying on age-based guesses, since growth rates vary widely between children.

Tips

1. Measure both feet at the end of the day when they are slightly larger from activity, then size to the larger foot
2. A good fit leaves about 1 cm (roughly a thumb’s width) between the end of your longest toe and the front of the shoe
3. When ordering a half-size that falls between EU whole sizes, go up to the next EU size — EU sizes run slightly smaller than their half-size US equivalent
4. Athletic running shoes typically fit half a size smaller than casual shoes in the same brand — consider ordering a half size up for running footwear
5. For children, re-measure foot length every 8-10 weeks since feet grow fastest between ages 2 and 6
6. If a brand’s size chart conflicts with this converter, trust the brand’s own chart — there is no legal standard for shoe sizing and manufacturers vary