What does this tool do?
Shoe sizing is not fully standardised, but foot length gives a reliable starting point. This calculator converts centimetres into US men, US women, UK and EU sizes and suggests a fit adjustment for wide or narrow feet.
The Formula
US men ≈ 3 × foot length (in) − 22; US women = US men + 1.5; UK = US men − 0.5; EU ≈ (foot length cm + 1.5) × 1.5Frequently Asked Questions
Should I size up for running shoes?
Many runners choose a half size up to allow for foot swelling and toe room. Use the calculated size as a baseline and check the brand size guide.
Why do shoe sizes differ between brands?
Lasts, materials and sizing charts vary by brand and model. Foot length is more consistent than a size label, so compare it with the brand centimetre chart.