If you are using an on-point layout, you will usually need to cut quarter-square triangles to fill in the sides, and half-square triangles for the corners of the quilt. The measurements are rounded up, so some trimming may be needed after the top is assembled.
If you need a size that is not listed, scroll down for the formulas and get out your calculator!
Finished Block Size (not including seam allowances) |
Cut square size |
Cut square size for corner triangles. Cut each square once on the diagonal to make 2 triangles. |
5" |
8 3/8" |
4 1/2" |
6" |
9 3/4" |
5 1/8" |
7" |
11 1/4" |
5 7/8" |
8" |
12 5/8" |
6 5/8" |
9" |
14" |
7 1/4" |
10" |
15 1/2" |
8" |
11" |
16 7/8" |
8 3/4" |
12" |
18 1/4" |
9 3/8" |
13" |
19 3/4" |
10 1/8" |
14" |
21 1/8" |
10 7/8" |
15" |
22 1/2" |
11 1/2" |
16" |
23 7/8" |
12 1/4" |
Other Sizes |
Multiply finished square size by 1.414 and add 1.25. Round up to nearest 1/8". |
Divide finished square size by 1.414 and add .875. Round up to nearest 1/8". |