In order to measure your foot, it is very important that you do it in the following way so that you don't make mistakes:

• Put a piece of paper on the floor  

• Put your foot on the paper, it is important that your foot is not larger than the paper. If this is the case, you can put two pieces of paper together.

• Now relax your foot and mark heel of your foot with a line and the longest finger.

• Now it's just a matter of measuring the distance between the two points you marked on the paper with measuring tape and make a note of it (in centimeters (CM) if possible as charts usually use this metric).