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.
CM to EU conversion
From centimetres to EU kids' sizes the offset grows from 9 to 14 with no reset, since EU counts straight up: 16 cm is EU 26 and 22 cm is EU 35.5. This is the steadier way to size a growing child, because the EU number never doubles back the way US and UK do. Measuring the foot and reading to EU gives one rising scale, so the only judgement left is how much growing room to add on top.
At this size, CM to EU
One size up from 20 cm, EU moves 0.5 to EU 33.5 while the metric length rises 0.5 to 20.5 cm. Both 20 cm and EU 33 are whole numbers here, so nothing rounds. For 20 cm, the EU column here runs EU 32, EU 33, EU 33.5, stepping a half size at a time.
Foot length vs shoe length
A CM shoe size is your measured foot length, not the space inside the shoe.
Brands add 0.5 to 1.0 cm of toe room so your toes clear the front. Japanese cm
labels already include about 1 cm of it, so a JP 24.0 measures near 25 cm
inside; an EU number instead describes the last. That built-in gap is why
conversion tables disagree.
Why one foot length gives many sizes
Size Chart CM EU US UK 18.5 30 11.5 10.5 19 31 12 11 19.5 32 12.5 11.5 20 33 13 12 20.5 33.5 13.5 12.5 21 34 1 13 21.5 35 1.5 13.5
Frequently Asked Questions Does 20 cm round up or down in EU? 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.
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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.