bearisgray

For this example:

the block/unit is 12 inches, finished size
the seam allowances are 1/4 inch
the pieces are all the same size

[TABLE]
[TR]
[TD="bgcolor: #bec0bf"]

[/TD]
[TD="bgcolor: #bec0bf"]

[/TD]
[TD="bgcolor: #bec0bf"]

[/TD]
[TD="bgcolor: #bec0bf"]

[/TD]
[TD="bgcolor: #bec0bf"]

[/TD]
[TD="bgcolor: #bec0bf"]

[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Number of Pieces in Block/Unit
[/TD]
[TD] Grid
[/TD]
[TD] Cut size of piece(s)
[/TD]
[TD] Finished size of piece(s)
[/TD]
[TD="colspan: 2"] Number of square inches needed for block/unit
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] One
[/TD]
[TD] 1 x 1
[/TD]
[TD] 12-1/2 x 12-1/2
[/TD]
[TD] 12 x 12
[/TD]
[TD] 1 x 12-1/2 x 12-/12
[/TD]
[TD] 156-1/4
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Four
[/TD]
[TD] 2 x 2
[/TD]
[TD] 6-1/2 x 6-1/2
[/TD]
[TD] 6 x 6
[/TD]
[TD] 4 x 6-1/2 x 6-1/2
[/TD]
[TD] 169
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Nine
[/TD]
[TD] 3 x 3
[/TD]
[TD] 4-1/2 x 4-1/2
[/TD]
[TD] 4 x 4
[/TD]
[TD] 9 x 4-1/2 x 4-1/2
[/TD]
[TD] 182-1/4
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Sixteen
[/TD]
[TD] 4 x 4
[/TD]
[TD] 3-1/2 x 3-1/2
[/TD]
[TD] 3 x 3
[/TD]
[TD] 16 x 3-1/2 x 3-1/2
[/TD]
[TD] 196
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Twenty-five
[/TD]
[TD] 4 x 5
[/TD]
[TD] 2-9/10 x 2-9/10
[/TD]
[TD] 2.4 x 2.4
[/TD]
[TD] 25 x 2-9/10 x 2-9/10
[/TD]
[TD] 210-1/4
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Thirty-six
[/TD]
[TD] 6 x 6
[/TD]
[TD] 2-1/2 x 2-1/2
[/TD]
[TD] 2 x 2
[/TD]
[TD] 36 x 2-1/2 x 2-1/2
[/TD]
[TD] 225
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Sixty-four
[/TD]
[TD] 8 x 8
[/TD]
[TD] 2 x 2
[/TD]
[TD] 1-1/2 x 1-1/2
[/TD]
[TD] 64 x 2 x 2
[/TD]
[TD] 256
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] Eighty-one
[/TD]
[TD] 9 x 9
[/TD]
[TD] 1-5/6 x 1-5/6
[/TD]
[TD] 1-1/3 x 1-1/3
[/TD]
[TD] 81 x 1-5/6 x 1-5/6
[/TD]
[TD] 272-1/4
[/TD]
[/TR]
[TR]
[TD="bgcolor: #dcdcdc"] One hundred forty-four
[/TD]
[TD] 12 x 12
[/TD]
[TD] 1-1/2 x 1-1/2
[/TD]
[TD] 1 x 1
[/TD]
[TD] 144 x 1-1/2 x 1-1/2
[/TD]
[TD] 324
[/TD]
[/TR]
[/TABLE]