fabric cutting measurements for 3 sizes of scrappy log cabin blocks

For a 4-inch finished block:

center square 1 1/2 inches
logs 1 inch wide

For a 9-inch finished block (pictured above):

center square 3 1/2 inches
logs 1 1/2 inches wide

For a 12-inch finished block:

center square 3 1/2 inches
logs 2 inches wide

For all of these, I use one center square and then 3 rows of "log" strips, so a total of 12 log strips. There's a good tutorial for making these blocks at Melly and Me.