A 150 mm foot marks the small end of this range, a length most children reach around age three; Austrian tracking shows the foot still adding close to 1 mm a month at this stage.
UK to US conversion
UK and US kids' sizes sit one number apart, UK 10 to US 11, until the US scale resets two steps before the UK one. Between a 210 and 215 mm foot the pair breaks: US has already restarted at 1 while UK still reads 13, a 12-number gap that closes once UK resets too. Add one to the UK number everywhere except that short window, where the two scales briefly disagree by a full cycle.
At this size, UK to US
One size up from UK 7, US moves 0.5 to US 8.5 while UK rises 0.5 to UK 7.5, holding their spacing. Both UK 7 and US 8 are whole numbers here, so nothing rounds. For UK 7, the US column here runs US 8, US 8.5, US 9, stepping a half size at a time.
Size Chart UK EU US CM 7 24 8 15 7.5 25 8.5 15.5 8 26 9 16 8.5 27 9.5 16.5
Frequently Asked Questions Does UK 7 round up or down in US? With the foot still growing, round to the larger size: the extra millimetres become fit within weeks. Aim for 12 to 17 mm past the longest toe when the shoe is on.
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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.