Put a piece of paper on the floor, place your bare foot on the paper. Hold the pencil straight against your foot and trace the outline of your foot.(Reminder: It is more accurate measuring with socks or stockings you will wear for new shoes.)
Mark the tip of longest toe and back of the heel, measure the length between them with your ruler.
Repeat steps above for your other foot, use the longer and wider one.Check with our size chart for the style of shoes you have interest, then select your size.