I have made a free printable for some of my fabric placemats I make using fabric strips measuring generally 2.5″x44″. This includes size guide for round and oval placemats.
PRINTABLE FABRIC PLACEMATS SIZE GUIDE
Keep in mind that these are guides. They are not exact since there will be minor factors in volved that can change the total size outcome. For example, how you sew your strips together some might be wider then others depending on how you sew. If you trim off ends of any of the strips that will make the measurements slightly different too. So this is to be used as a guide that will make these pretty close in size.
Hope you find these helpful!
Kristy
FAQ:
Start refers to the starting length of the first piece of fabric before turning your material and folding it to start to coil around to make the rugs.
Strips refers to the number of fabric strips it will take to make each item that size.
Size refer to my own sizing of how large each project is in terms of small, medium, large, etc.