charm squares = 5"
layer cakes = 10"
fat quarters = 18" X (20-22") depending on width of fabric
jelly rolls = 2 1/2" x (width of fabric) 40-42"
postage stamps = 1 1/2" square
i noticed some new ones at my lqs- i don't know what they were called but they were 2 1/2" squares.