Shoe Size Conversion Chart — US, UK, EU, CM

Shoe sizing is one of the most confusing conversion systems in existence. A US men’s 10 is a UK 9, an EU 44, and 28 cm — four numbers for the same foot. Here’s how each system works and how to convert between them.

The conversion formulas

Men's conversions:
  UK = US − 1
  EU = (US + 31.5) × 1   (approximate: US + 33)
  CM = (US + 18) × 0.847  (approximate)

Women's conversions:
  UK = US − 2
  EU = US + 31
  CM = (US + 18.5) × 0.847

Universal (most reliable):
  Measure foot length in cm, then:
  EU = cm × 1.5 + 2
  US Men's = (cm − 22) × 1.5 + 7  (approximate)
  US Women's = (cm − 21) × 1.5 + 7  (approximate)

Quick reference — Men’s sizes

US	UK	EU	CM (foot length)
7	6	40	25.0
8	7	41	26.0
9	8	42.5	27.0
10	9	44	28.0
11	10	45	29.0
12	11	46	30.0

Quick reference — Women’s sizes

US	UK	EU	CM (foot length)
5	3	35.5	22.0
6	4	36.5	23.0
7	5	38	24.0
8	6	39	25.0
9	7	40	26.0
10	8	41.5	27.0

Worked example

Your foot measures 27.5 cm. What size do you need?

EU: 27.5 × 1.5 + 2 = 41.25 + 2 = 43.25 → size EU 43
US Men's: closest to 9.5–10
UK Men's: US − 1 = 8.5–9

If you're between sizes, always round up.

How to measure your feet properly

1. Stand on paper with your heel against a wall
2. Mark the longest toe with a pencil (keep it vertical)
3. Measure from the wall to the mark in centimeters
4. Measure both feet — use the larger one
5. Measure in the afternoon (feet swell throughout the day)

When to use shoe size conversion

• Shopping from international brands online
• Buying shoes while traveling abroad
• Converting between men’s and women’s sizing (women’s is typically US men’s + 1.5)
• Understanding children’s sizing progression
• Verifying that “European sizing” on a shoe actually matches the standard

Tips for the right fit

• Foot length isn’t everything — width matters too (narrow, standard, wide)
• Running shoes: go half a size up for toe room
• Leather shoes stretch; synthetic doesn’t
• Different brands within the same country vary by 0.5–1 size
• CM measurement is the most universal and brand-independent reference
• Socks matter: bring the socks you’ll actually wear when trying shoes

Convert your shoe size across any system with OurDailyCalc’s shoe size converter — enter your foot length in cm or any country’s size for instant conversion.

TL;DR

• US Men’s − 1 = UK; US + 33 ≈ EU
• Women’s: US − 2 = UK; US + 31 ≈ EU
• Measure your foot in cm for the most reliable conversions
• Always size up when between sizes
• Measure in the afternoon (feet are larger) and use the bigger foot