Use this formula to order framing materials. You don’t need a math degree to estimate framing materials for walls. Here’s a formula that works every time, no matter how many doors, windows or corners your walls have: One stud per linear foot of wall. Five linear feet of plate material (bottoms, tops and ties) per linear foot of wall. It’ll look like too much lumber when it arrives, but you’ll need the extra stuff for corners, window and door frames, blocking and braces.