When Measuring For Single-Wrap Straps, Measure From The Attachment Hole On One Side Of The Frame, To The Inside Edge Of The Other Side Of The Frame. (This Will Be Your Test Strap Measurement). [This Will Also Be Your Measurement For Calculating A Strap Order] After Trying One Strap You Can Decide To Add Or Subtract Length. Not All Frames Are A Constant Width, Some Will Flare Out At The Top Or Bottom. You May Need Straps Of Different Lengths On The Same Piece Of Furniture.