Measuring length without a ruler can be a common task, for instance, when you need to quickly measure something and don’t have a ruler handy. There are several methods to measure 1 foot without a ruler. One common method is to use your own body as a reference. An average adult male’s foot is about 12 inches long, so you can use your foot to estimate the length of an object.
Another method is to use a standard-sized object as a reference. For example, a dollar bill is 6 inches long, so you can use two dollar bills to measure 1 foot. You can also use a credit card, which is 3 inches long, to measure half a foot.