Shoe Size Converter
Type a size in any box — US, UK, EU, foot length (cm or inches), Japan, China or Mondopoint — and every other system fills in instantly. Each result is anchored to foot length, the one measurement that doesn't change between countries.
Convert any size
Japan & China sizes are based on foot length (JP in cm, China in mm); Mondopoint is foot length in mm. US/UK/EU are last-based and shown to the nearest half size.
How to measure & use it
Measure your foot, don't guess
Stand on paper at day's end (feet swell), heel to a wall, mark your longest toe, measure heel-to-mark in cm. Or print our free foot ruler.
Type it in any box
Enter the value in whichever system you know — every other box updates at once.
Size for the larger foot
Most people have one foot bigger. Go by the larger one, and size up if you're between two.
Check the brand note
The orange note flags brands that run small or large. For a specific brand, try the Brand Size Finder.
Brannock-style gauge to measure length and width accurately at home — size from your feet, not the label.
View on Amazon →Take up half a size of slack and add cushioning when a shoe runs large.
View on Amazon →Stop heel slip when you've sized up for comfort or width.
View on Amazon →Frequently asked questions
How do I convert my US shoe size to UK?
For men, the UK size is one size smaller than the US (a US 9 is a UK 8). For women the gap is larger — about two sizes. Type your size into any box above to see the exact match, but anchor to your foot length for the most reliable result.
What is my EU shoe size if I'm a US 9?
A men's US 9 is roughly an EU 42.5, derived from a foot length of about 26.3 cm. EU sizes use the Paris-point scale measured on the shoe's last, so the conversion isn't a whole number.
Is foot length the same as shoe size?
No. Shoe size is based on the internal length of the shoe (the last), which is longer than your bare foot to leave room. Most charts assume around 1–1.5 cm of extra length over the foot.
Why do two shoes in the same size fit differently?
Every brand uses its own last and ease allowance. Nike and adidas often run about half a size small; Converse and Dr. Martens run large. The Brand Size Finder applies each brand's known tendency for you.
Should I size up if I'm between two sizes?
Usually yes — size up to the larger, and always fit the larger foot, since most people have one foot bigger. A snug shoe can't be stretched as easily as a slightly loose one can be padded.
How these conversions are calculated
Every size is anchored to foot length and interpolated from an authoritative CM reference table (cross-checked across brand and retailer charts on the Mondopoint/Paris-point/barleycorn basis). Published sizes match the cited anchors across the full range; between brands, expect up to half a size of legitimate variance, which we flag per brand.
Sources: The Brannock Device Company — foot-length to size basis (brannock.com); Brannock Device foot-length table, mm (en.wikipedia.org/wiki/Brannock_Device); Cross-checked CM→US/UK/EU anchor table (multiple retailer/brand charts, 2026); Nike official men's/women's footwear size guides (nike.com).