Rug manufacturers often list their products with standard sizes. A rug could measure 5’2” x 7’2” which is closest to the 5x7 size category. A rug measuring 7’7” x 10” would be put in the 8x10 size category. The first bullet point lists the exact dimensions in feet and inches. Please read these carefully if you have very specific needs for your space. Reach out to our customer service department if you have questions about a particular rug. We are happy to help!