Shoe Size Calculator – Convert US, UK & EU Sizes
Convert foot length into US, UK and EU shoe sizes.
About the Shoe Size Calculator
What is the Shoe Size Calculator?
A shoe size calculator converts your foot length into the equivalent US, UK and EU shoe sizes.
Why use this calculator?
Shoe sizing systems differ between countries and between men and women, so measuring your foot and converting is more reliable than guessing.
How to use it
- Measure your foot length from heel to longest toe.
- Choose the unit and whether you want men's or women's sizing.
- Read the equivalent sizes.
Formula
Sizes are derived from foot length with a small offset that differs by system and gender.
Measure your feet in the evening and use the longer foot; sizes are approximate because lasts vary by brand.
Frequently Asked Questions
Should I size up or down?
For running shoes, size up about half a size; for dress shoes, use your measured size. Fit varies by brand.
Why do men's and women's sizes differ?
The two scales use different zero points, so the same foot length maps to different numbers.
Can I print or share my result?
Yes. Use your browser's print function or screenshot the result. The page is designed to print cleanly.
What if my inputs are outside the typical range?
The calculators accept a wide range of values, but extreme inputs may produce unrealistic results. Double-check the units you are using.
How often is the calculator updated?
We review formulas and rates periodically to keep them aligned with current standards and published data.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.