Intergtm

Shoe Size Converter

Enter your shoe size in EU, US, UK, or Japan and get every equivalent in one click.

Inputs

EU: 35–48 · US Men's: 3.5–13 · US Women's: 5–14 · UK: 2.5–12 · JP: 220–305

Results update as you type, and the address bar keeps your numbers so the link you share reopens this exact calculation.

EU size

42

US Men's size

8.5

US Women's size

10

Detailed results
UK size7.5
Japan (JP) size265 mm

What this result means

EU size: 42.

EU 42 = EU 42 · US Men's 8.5 · UK 7.5

How this is calculated

EU sizes follow ISO 9407 (Mondopoint) — based on foot length in cm.
UK ≈ EU − 33.5 · US Men's ≈ EU − 33 · US Women's ≈ EU − 31 · JP = foot length in mm.

Shoe size systems

| EU | US Men's | US Women's | UK | JP (mm) | |----|----------|------------|----|---------| | 38 | 5.5 | 7 | 4.5 | 240 | | 39 | 6 | 7.5 | 5 | 245 | | 40 | 7 | 8.5 | 6 | 255 | | 41 | 7.5 | 9 | 6.5 | 260 | | 42 | 8.5 | 10 | 7.5 | 265 | | 43 | 9 | 10.5 | 8 | 270 | | 44 | 10 | 11.5 | 9 | 280 | | 45 | 10.5 | 12 | 9.5 | 285 |

US Men's vs Women's

US Women's sizes run about 1.5 sizes larger than Men's for the same foot. EU sizing is gender-neutral — a EU 42 is the same physical shoe regardless of the label.

Japan (JP) sizing

JP sizes are foot length in millimeters. EU 42 = JP 265 (26.5 cm foot). Used by many Japanese brands (Asics, Mizuno, Onitsuka Tiger) and some European athletic labels for technical sizing.

Tips for buying shoes online

  • Measure both feet — most people have one foot slightly larger. Buy to fit the larger foot.
  • Add 0.5–1 cm to your measured foot length: toes should not press the front of the shoe.
  • Leather shoes stretch; synthetic shoes do not. Size down slightly for leather, true-to-size for synthetics.
  • When between two sizes, go up for casual footwear, true-to-size for running shoes.

Assumptions

  • Based on ISO 9407 Mondopoint reference and industry-standard conversion tables.
  • Nearest equivalent shown where exact half-sizes don't exist in a system.
  • Actual fit varies between brands and styles regardless of nominal size.

Frequently asked questions

›What is EU 42 in US shoe size?

EU 42 = US Men's 8.5 = US Women's 10 = UK 7.5 = JP 265 mm.

›What is EU 38 in US women's?

EU 38 = US Women's 7. Men's equivalent is US 5.5, UK 4.5.

›What is EU 43 in US?

EU 43 = US Men's 9 = US Women's 10.5 = UK 8.

›What is EU 44 in US?

EU 44 = US Men's 10 = US Women's 11.5 = UK 9.

›What is EU 45 in US?

EU 45 = US Men's 10.5 = US Women's 12 = UK 9.5.

›Why are US Men's and Women's shoe sizes different?

US men's and women's shoes use different sizing scales. Women's sizes run about 1.5 sizes larger than men's for the same foot length. EU and UK systems use a single unified scale — EU 42 fits the same foot regardless of whether it's labeled Men's or Women's.

›How accurate are shoe size conversions?

Conversions give the closest nominal equivalent. Actual fit varies between brands — a Nike EU 42 may fit differently than an Adidas EU 42. Always check the brand's specific size guide for technical footwear like running shoes.

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