OptiDrop

Shoe Size Converter — US, UK, EU, CM

Convert shoe sizes between US, UK, EU, and CM for men, women, and kids. Select your size and see all equivalents instantly. 100% free, no sign-up.

Free Shoe Size Converter Online — US, UK, EU, CM

OptiDrop's Shoe Size Converter lets you instantly convert between US, UK, EU, and CM shoe sizes for men, women, and kids. Simply select your gender, choose the sizing system you know, pick your size, and the tool displays all equivalent sizes across the other systems.

How Do Shoe Size Systems Differ?

Different countries use different shoe sizing systems. US sizing uses separate scales for men and women. UK sizing is similar to US but typically 0.5 to 1 size smaller. EU sizing uses a continuous scale based on the Paris point (2/3 cm). CM (or Mondopoint) directly measures foot length in centimeters and is the most universal system.

Tips for Buying Shoes Online

When buying shoes internationally, always use the CM measurement as your reference since it is based on actual foot length. Measure your feet in the afternoon when they are slightly larger. Remember that shoe fit also depends on width, brand, and style, so size charts are a guide, not a guarantee.

Frequently Asked Questions

Select your gender (men or women), choose your US shoe size from the dropdown, and the tool will instantly display the equivalent EU, UK, and CM sizes. Note that men's and women's size conversions differ because the sizing systems are not the same.
No, men's and women's shoe sizes differ in most sizing systems. In US sizing, women's sizes are typically 1.5 to 2 sizes larger than men's for the same foot length. For example, a men's US 8 is roughly equivalent to a women's US 9.5 or 10.
CM (centimeters) or Mondopoint is a sizing system based on the actual length of your foot in centimeters. It is the most precise sizing method and is commonly used for ski boots, military footwear, and in many Asian countries. To find your CM size, measure your foot from heel to longest toe.
Place your foot on a piece of paper against a wall. Mark the tip of your longest toe. Measure the distance from the wall to the mark in centimeters. This is your foot length. Use this CM measurement in the converter to find your size in any system.

Last updated: June 2026