A men’s size 0 shoe will have a length of 8 inches on the inside. Then each size up adds 1/3 inch of length. So a size 5 is 8 + 5/3 = 9 2/3 inches long. This means that a size 12 shoe is 12 inches long, or one foot. Women’s sizes are similar, but size 0 starts at just 7 1/2 inches. So a women’s size 5 is 7 1/2 + 5/3 = 9 1/6 inches long.
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