Jul 19 2008
Table of Side Setting Triangle Sizes
Ever been confused by the math involved in determining the size of side setting triangles? I sure have. These are the quarter square triangle cuts that are usually used to fill in along the edges of quilts that are set on point.
I hope the table below helps to sort it all out for you. The first column shows the finished size of the quilt blocks you are using, i.e. a 6 1/2 inch block finishes at 6 inches. The second column shows the size of the square you should cut.
After cutting the square, make two additional cuts, one along each diagonal, like a big X. This will leave you with four side setting triangles. Have an odd sized block? Here is the formula: multiply the size of the finished block by 1.414. Take that sum and add 1 1/4 (1.25) inches for the seam allowances involved. That’s it.
| Block Size in Inches | Square Size |
| 1″ | 2 3/4″ |
| 2″ | 4 1/8″ |
| 3″ | 5 1/2″ |
| 4″ | 7″ |
| 5″ | 8 3/8″ |
| 6″ | 9 3/4″ |
| 7″ | 11 1/4″ |
| 8″ | 12 5/8″ |
| 9″ | 14″ |
| 10″ | 15 1/2″ |
| 11″ | 16 7/8″ |
| 12″ | 18 1/4″ |
| 13″ | 19 3/4″ |
| 14″ | 21 1/8″ |
| 15″ | 22 1/2″ |
| 16″ | 23 7/8″ |
| 17″ | 25 3/8″ |
| 18″ | 26 3/4″ |
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