Choose the area where you want to add the rug.
Measure from one end of the area to the opposite end of the area. This is the length. For example, one side could measure 7 feet.
Measure from one end of the area to the opposite end of the area from the sides that you did not measure in Step 1. This is the width. In the example, the side could measure 5 feet. In this case, you will have to go with a smaller size or bigger size since there is no exact match for your measurements.
Find the standard size that closely matches your measurements. In the example, the measurements are 5 feet by 7 feet. The closest standard size is 5 feet by 8 feet.