How do you measure your feet without a ruler?

To measure your feet without a ruler, you can use a piece of string or a shoelace. Simply place the string alongside your foot, marking where your toe ends, and then measure the string against a standard object, like a piece of paper or a credit card. Alternatively, you can use your own foot as a reference by measuring it against a common household item, like a book or a cereal box, noting its length for comparison.