How much fabric do I need?

Hi there! I'm working on creating a DIY custom headboard for my guest room using plywood. The headboard will consist of 3 plywood boards measuring: 4' x 3'11 1/2 (2 boards) and 4' x 3'11 (1 board). I will add batting to the boards first, and then cover each board with fabric (using a staple gun to secure the batting and fabric on the back). Can someone help me calculate how much yardage of fabric is needed to complete this? Thank you!