Just an interesting FYI that I recently learned. Google does math. In this case, in the google search bar type 9 X 13 = and hit enter. It says 117, which is the number of square inches in the 9 X 13 pan. Then type 10 X 14 = and you get 140 SQ IN.
Just like Andy M said, about 15 % bigger.
Just sharing the calculator function, cause, it's handy when a calc is not available. Kind of like kast night when I learned to use google to search for posts on DC.