60 x 60 inch is a typical "Throw"
2 1/2 inch Cut strips/Squares = 2 inch size finished strips/Squares.
How many squares do you need in a horizontal row? 30
How many squares do you need in a Vertical row? 30
How many 2 1/2 inch squares are in a 60 x 60 Throw? Multiply 30 x 30, = 900
How long of a 2 1/2 inch wide STRIP do you need to obtain 30 Squares?
5 inches = 2 squares; 10 inches = 4 squares; 20 inches = 8 squares; 36 inches = 14 squares
If you have a 42 inch (Width of Fabric) STRIP, how many Squares can you cut from it? 16.
If you have a 36 inch Length of Fabric, how many blocks can you cut from it? 14
In order to have NO WASTE, Each length of fabric should be a multiple of 5: cutting a length of 35 inches (or 40) rather than 36 inch will yield no wasted fabric.:
Now, you need to know if you are making your Irish Chain with ONLY TWO Fabrics???? or more, like a Scrappy Quilt? Find your pattern of a Single Block, and simply COUNT how many dark; how many light squares you need. Simple as PI!