Measure all around outside of top, add 10inches, divide by 40
(if cutting crosswise grain)...this give you the number of strips you need. Using 40 in as fab width gives you a little cushion, cause your fab is probably 44 or 45 in. wide., also the added 10 inches will cover your miters at the corners. Of course you should round up from the number you get from this calc. If it is 3.7....cut 4 strips. I almost always have extra, and save these strips for a log cabin in my future.
sue