Shoe Size Conversion
Convert US, UK and EU shoe sizes.
Approximate shoe-size conversion between US, UK and EU.
How the Math Works
The Shoe Size Conversion calculator uses two key formulas to translate between US, UK, and EU sizing systems. For UK conversions, the formula UK ≈ US − 1 assumes a rough one-size difference, though this can vary slightly by brand. The EU conversion relies on a linear approximation: EU ≈ US × 1.27 + 31, which scales and shifts the US size to estimate the European equivalent. These formulas are simplified models and may not account for regional variations in sizing standards or brand-specific adjustments, but they provide a practical starting point for conversions.
Practical Applications
To use the calculator, input your known shoe size in US units, and it will instantly compute the corresponding UK and EU sizes using the formulas above. For example, a US size 9 would convert to approximately UK 8 and EU 42.4 (rounded to 42 or 43 depending on rounding rules). This tool is especially useful when shopping online from international retailers, as it helps avoid mismatches and returns by aligning your foot measurements with regional sizing conventions before purchase.
Day-to-Day Use
This calculator simplifies everyday challenges like buying shoes while traveling, ordering from foreign websites, or comparing sizes across brands. Instead of manually calculating or guessing, users can quickly determine the correct size for their region, saving time and reducing the risk of ill-fitting footwear. It’s particularly valuable for frequent travelers, online shoppers, or anyone who needs to navigate varying sizing systems without the hassle of trial and error.
Worked example
US 9 → UK 8, EU ~42.
FAQ
Women's sizes?
Subtract ~1.5 from the US men's size for US women's.