International Shoe Size Conversion Calculator | Accurate Size Chart

Buying shoes should be exciting, but it often turns into a headache when you’re unsure about sizes. Maybe you’ve seen a pair of sneakers on a UK website, but you only know your US size. Or you’re shopping for Italian dress shoes and don’t know what “EU 42” means in your system. That’s where an International Shoe Size Conversion Calculator makes life simple. With just three details — your gender, the country sizing system you know, and your shoe size — it instantly gives you the right equivalent size across regions like US, UK, EU, and Japan. No more guessing. No more tight or floppy shoes.

Why Shoe Size Conversion Matters

Getting the wrong size isn’t just an inconvenience — it affects comfort, performance, and even your health. Shoes that are too small can cause blisters, corns, or bunions. Too big, and you risk slipping, poor posture, and back pain. With so much online shopping and cross-border brands, knowing your accurate size in every region saves money, reduces returns, and helps you buy with confidence.

What the Calculator Asks You

To make things simple, the calculator only needs three quick inputs:

• Gender: Men’s, women’s, or kids’ sizes — these systems differ significantly. For example, a US women’s 8 is not the same as a men’s 8.
  
• From Country/System: The system you’re starting with (US, UK, EU, JP/Mondopoint). This tells the calculator which scale to convert from.
  
• Shoe Size: Your current size in that system. If you’re unsure, measure your foot length (heel to longest toe) in cm or mm and use that as your baseline.
  

The Logic Behind Conversion

Most shoe size conversions rely on foot length as the universal reference. Once your foot length is estimated, it maps to each country’s scale. Here’s how it works in simple terms:

• Mondopoint (JP) = Foot length in millimetres (e.g., 260 mm = JP 260).
  
• EU size ≈ Foot length in cm × 1.5.
  
  • Example: 26 cm × 1.5 = EU 39.
    
• UK size ≈ (3 × foot length in inches) − 23.
  
• US Men’s size ≈ (3 × foot length in inches) − 22.
  
• US Women’s size = US Men’s size + 1.5.

So, if you input a US men’s 9, the calculator first finds your foot length, then gives back EU, UK, and JP equivalents.

How to Use the Calculator Step by Step

1. Pick your gender. This makes sure the right offset is applied between men’s and women’s charts.
   
2. Select the country system you know. For example, “US” if you know your American size.
   
3. Enter your size. Let’s say US men’s 9.
   
4. The calculator converts it into foot length.
   
   • (9 + 22) ÷ 3 = 10.33 inches → 26.2 cm.
     
5. It outputs other systems.
   
   • UK = 8
     
   • EU = 39–40
     
   • JP = 260
     
6. Check fit advice. Since brand sizing can vary, the tool reminds you to allow a thumb’s width of space for comfort.