How much fabric to make a twin size bed skirt?

How much fabric do i need to make a queen sized ruffled bed skirt/

You have to measure your bed . measure your box spring from the head of the bed to the foot of the bed and multiply that by 2. Then measure the width of you bed add both numbers together then mutliply by 2.5. that should give you how many yards of fabric you need. then you want to measure from the top of the box spring to the floor or how ever long you want the bedskirt to hang and you want to add two inches to allow for hemming and attaching the ruffle to the flat material that goes between the mattress and box spring this measurement should tell you how wide your material should be. most material comes in 45 in or 60 so you should be good either way