What foot length is 26cm?
It means you're US size 9 according to the size chart. If the length of your foot is 10.50 inches long, first you need to convert it into centimeter which is 26.67 cm (1 inch = 2.54 cm). 26.67cm can be rounded up to 27 cm meaning you're US size 9. Besides sizing, you should also pay attention to fitting.