I copied this from a web site
http://www.sylviasquiltdepot.com/sch...e.htm#mattress
GOT IT COVERED?
Don't know how big to make your quilt?
Remember to add 12-14" on each side (and the foot) for the drop and 14" at
the head if you want it to tuck under a pillow.
Mattress Size Quilt Size (These are all measurements for a 16" drop)
Receiving N/A 36" X 45" or 45" X 45"
Crib 23" X 46"
Lap Quilt N/A Between 52" and 68" wide. 52" to 78" in length.
Twin 39" X 75" Between 64" and 72" wide. 86" to 96" in length.
Full 54" X 75" Between 70" and 88 wide. 86" to 100" in length.
Queen 60" X 80" Between 88" and 99" wide. 94" to 108" in length.
King 76" X 80" Between 94" and 108" wide. 94" to 108" in length.
Measurements are approximate.
Quilt Size Amount of Backing Needed
Twin 71" x 101" 6 yards
Full 86" x 101" 7.5 yards
Queen 92" x 106" 8.25 yards
King 108" x 106" 9.25 yards