US 4 = UK 3.5 = EURO 36, US 4.5 = UK 4 = EURO 36.5, US 5 = UK 4.5 = EURO 37.5, US 5.5 = UK 5 = EURO 38, US 6 = UK 5.5 = EURO 38.5, US 6.5 = UK 6 = EURO 39, US 7 = UK 6 = EURO 40, US 7.5 = UK 6.5 = EURO 40.5, US 8 = UK 7 = EURO 41, US 8.5 = UK 7.5 = EURO 42, US 9 = UK 8 = EURO 42.5, US 9.5 = UK 8.5 = EURO 43, US 10 = UK 9 = EURO 44, US 10.5 = UK 9.5 = 44.5, US 11 = UK 10 = EURO 45, US 12 = UK 11 = EURO 46, US 13 = UK 12 = EURO 47.5