Utility July 13, 2026 · 8 Min Read

Shoe Size Calculator – Guide & Formulas

Convert shoe sizes between US, UK, EU, JP, and CM systems, and estimate perfect shoe size based on your actual foot length.

Finding the perfect shoe fit can be difficult due to differing size standards across the United States, Europe, United Kingdom, and Asia. This Shoe Size Calculator allows you to easily convert shoe sizes between major regional sizing charts and calculate your recommended shoe size using actual foot length measurements in inches or centimeters.

Key Takeaway

Use the free Shoe Size Calculator to convert shoe sizes between us, uk, eu, jp, and cm systems, and estimate perfect shoe size based on your actual foot length. Get instant results with step-by-step explanations.

How to Use the Shoe Size Calculator

  1. Select whether you are calculating for Men, Women, or Children.
  2. Enter your actual foot length in centimeters or inches, or choose your known size in a regional standard.
  3. Instantly read matching shoe sizes for the US, UK, Europe, Japan, and Centimeters (Mondopoint).
  4. Review tips for checking shoe width and ensuring optimal comfort.

The Formula

EU Shoe Size = 1.5 * (Foot Length in cm + 1.5) | US Men's Size = 3 * Foot Length (inches) - 22

Variable Definitions

  • Foot Length: The absolute distance from the heel to the tip of the longest toe
  • Mondopoint: The international standard sizing system based on foot length in millimeters

Converting Foot Length to International Sizes

A man measures his foot length and finds it is exactly 27 cm (10.6 inches).

  1. Step 1: Set Foot Length = 27 cm.
  2. Step 2: Calculate EU size: 1.5 * (27 + 1.5) = 1.5 * 28.5 ≈ 43 EU.
  3. Step 3: Calculate US size: (27 / 2.54) * 3 - 22 ≈ 10.6 * 3 - 22 = 31.8 - 22 = 9.8 (Size 10 US).
  4. Step 4: The recommended shoe sizes are US 10, UK 9, and EU 43.

Frequently Asked Questions

How should I measure my foot length for shoes?

Place a piece of paper flat on the floor against a wall. Stand on it with your heel lightly touching the wall. Trace around the front of your foot with a pen held vertically. Measure the distance from the edge of the paper (heel) to the furthest point of your drawing (longest toe) in inches or centimeters.

Should I buy shoes that are slightly larger than my foot length?

Yes. It is recommended to add approximately 1 to 1.5 cm (about 0.4 to 0.6 inches) to your actual foot length when choosing a shoe. This extra "wiggle room" allows your foot to expand naturally as you walk or run and prevents your toes from crowding.