Women's 5 and men's 4 share this 220 mm foot, the one-number offset that runs through every unisex conversion and explains why men's and women's charts never line up.
UK to US conversion
Women's UK sizes run two numbers below US, a wider gap than the one-size men's offset, so UK 6 is US 8 and UK 8 is US 10 the whole way. The two points a US number sits above the UK one never change across this scale, which makes the pair a clean fixed step. That steadiness is why a UK-bought shoe converts to US by adding two with no rounding, unlike the shifting EU conversions.
At this size, UK to US
One size up from UK 3, US moves 0.5 to US 5.5 while UK rises 0.5 to UK 3.5, holding their spacing. Both UK 3 and US 5 are whole numbers here, so nothing rounds. For UK 3, the US column here runs US 4.5, US 5, US 5.5, stepping a half size at a time.
Size Chart UK EU US CM 2 34 4 21 2.5 34.5 4.5 21.5 3 35 5 22 3.5 35.5 5.5 22.5 4 36 6 23 4.5 37 6.5 23.5
Frequently Asked Questions Does UK 3 round up or down in US? EU 35, US 5 and UK 3 land whole here, so this exact length rarely faces a rounding choice; between sizes, the larger laces down more kindly than the smaller pinches.
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Note Based on Mondopoint standard (foot length in mm) Women's sizing differs from men's by approximately 1.5 US sizes Heel height affects fit - measure standing Shoe sizes can vary by brand and style See a number that looks off? Report an error on this page.