Jul 21 2008
Calculate Corner Setting Triangles
Need some quick calculations for corner-setting triangles? The table below should help you sort it out. If it doesn’t list your block size, use this formula to calculate the size square you should cut. Divide the finished block size by 1.414 and then add .875.
Remember, you will be making one cut, separating the square into two triangle pieces. The outer two sides won’t be on the bias, but the seam you will be sewing is, so be careful. I like to starch my fabric first. This is just a suggestion, of course.
The first time I worked with corner-setting triangles, I used a plaid homespun. I would not suggest a plaid or stripe for a beginner.
My poor plaid distorted, creating a wave effect. It’s funny now, but it wasn’t then.
| Block Size |
Square Cut for Corner Triangle |
| 1″ | 1 5/8″ |
| 2″ | 2 3/8″ |
| 3″ | 3″ |
| 4″ | 3 3/4″ |
| 5″ | 4 1/2″ |
| 6″ | 5 1/8″ |
| 7″ | 5 7/8″ |
| 8″ | 6 5/8″ |
| 9″ | 7 1/4″ |
| 10″ | 8″ |
| 11″ | 8 3/4″ |
| 12″ | 9 3/8″ |
| 13″ | 10 1/8″ |
| 14″ | 10 7/8″ |
| 15″ | 11 1/2″ |
| 16″ |
12 1/4″ |
| 17″ |
13″ |
| 18″ |
13 5/8″ |
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