A fat quarter is a piece of fabric measuring 18″ x 22″. Fat quarters are a standard measurement for sampling fabrics or collecting fabric for a scrap or charm quilt. A fat quarter can be cut into 12 5 inch charm pieces.

Fat Quarters can be cut into:
6 – 6.5″ squares
9 – 6″ squares
12 – 5.5″ squares
12 – 5″ squares
16 – 4.5″ squares
20 – 4″ squares
30 – 3.5″ squares
42 – 3″ squares
56 – 2.5″ squares
90 – 2″ squares