To effectively use this size chart:
Use a tape measure and measure your foot with your usual badminton socks on. Measure from your toes to your heel.
From that exact measurement, add another 1-3mm for wiggle room and select the closest number in 'cm'.
Using your 'cm' measurement, refer to the corresponding UK, US or EU sizes accordingly to ensure you've selected the correct size for your Yonex badminton shoe.
Check out here for the Yonex Eclipsion Z2, Yonex SHB-65 Z2 and Yonex Aerus Z badminton shoes comparison and review.