What this calculator does
Shoe size conversion is helpful when comparing international listings, but it is never a perfect fit guarantee. Brands use different lasts, toe shapes and width assumptions.
Formula used
The calculator maps sizes through an approximate adult UK baseline, then converts to US men's, US women's, EU and Mondopoint equivalents.
How to read the result
Use the result to narrow the size range, then check the brand's own chart and returns policy. Foot length, width and shoe shape often matter as much as the printed size.
Assumptions
- Adult shoe size conversion only.
- Half sizes are approximated.
- Brand-specific sizing can differ from general conversion tables.
Sources and checks
This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.
Frequently asked questions
Why do brands fit differently?
The size number is only one part of fit. Last shape, width, upper material and intended use can make two shoes with the same size feel different.