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 US conversion
Centimetres convert to US kids' sizes by subtracting about 7 until the US scale resets, after which the same length reads roughly 20 less: 18 cm is US 11 but 21 cm, past the reset, is US 1. The foot measurement is the only figure that keeps rising cleanly through the jump. Sizing a growing child by the millimetre length, with room to spare, sidesteps the US number that doubles back mid-scale.
At this size, CM to US
One size up from 20 cm, US moves 0.5 to US 13.5 while the metric length rises 0.5 to 20.5 cm. Both 20 cm and US 13 are whole numbers here, so nothing rounds. For 20 cm, the US column here runs US 12.5, US 13, US 13.5, 2 sizes below the point where the US count rolls over to US 1.
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 US? 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.