When Measuring For Double-Wrap Straps, Wrap A Measuring Tape Around One Side Of The Frame Exactly As The Strap Would Be, Then To The Outside Edge Of The Other Side Of The Frame, Then Add 2 Inches. (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.