EU 33 reaches US 13, the last number before the US children's scale restarts at 1 for bigger feet, so 13 here is a large child's size, not an adult one.
EU to UK conversion
EU to UK kids' sizes drift apart from about 17 numbers, then the UK column resets to 1 near a 220 mm foot, so EU 35.5 is UK 1 while EU 35 just below is UK 13.5. The reset makes the UK number briefly plunge even as the EU number and the foot both climb. A parent reading a UK size off an EU one has to know which side of that reset the child sits, or the shoe comes a whole cycle wrong.
At this size, EU to UK
One size up from EU 33, UK moves 0.5 to UK 12.5 while EU rises 0.5 to EU 33.5, holding their spacing. Both EU 33 and UK 12 are whole numbers here, so nothing rounds. For EU 33, the UK column here runs UK 11.5, UK 12, UK 12.5, 4 sizes below the point where the UK count rolls over to UK 1.
Size Chart EU US UK CM 30 11.5 10.5 18.5 31 12 11 19 32 12.5 11.5 19.5 33 13 12 20 33.5 13.5 12.5 20.5 34 1 13 21 35 1.5 13.5 21.5
Frequently Asked Questions Does EU 33 round up or down in UK? Round up for growth, but do not read the coming US 1 as smaller: it sits one length above US 13, and foot length, not the number, tells you which is bigger.
ℹ️
Note Kids sizes transition to adult sizes around EU 38 / US 5 Children's feet grow rapidly - remeasure every 3-4 months Allow 10-15mm growing room when fitting Shoe sizes can vary by brand and style See a number that looks off? Report an error on this page.