Misty... :? my misread.....Patrice is right...sorry for the wrong info. You would have to keep the same ratio as the original for each inch or 1/2 inch added. so if the strip is 1 1/2 by 4 1/2 and you wanted to increase it....say 1 " then you would end up with 3 1/2 by 7 1/2. Using the table Patrice gave will help you immensely