Sizes for Corner and Side Triangles
This chart gives you the measurements for corner and side triangles for the most commonly used quilt-block sizes.
| Finished Block Size | Cut Size of Square for Corner Triangles | Cut Size of Square for Side Triangles |
| 2" | 2 3/8" | 4 1/4" |
| 3" | 3" | 5 1/2" |
| 4" | 3 3/4" | 7" |
| 5" | 4 1/2" | 8 3/8" |
| 6" | 5 1/8" | 9 3/4" |
| 7" | 5 7/8" | 11 1/4" |
| 8" | 6 5/8" | 12 5/8" |
| 9" | 7 1/4" | 14" |
| 10" | 8" | 15 1/2" |
| 12" | 9 3/8" | 18 1/8" |
| 14" | 10 7/8" | 21 1/8" |
| 16" | 12 1/4" | 23 7/8" |
| 18" | 13 5/8" | 26 3/4" |
| 20" | 15 1/8" | 29 5/8" |
| 24" | 17 7/8" | 35 1/3" |
Cutting tip: It is easier to cut fabric smaller than make it bigger, so cut squares for corner and side triangles " - 1" larger and trim them down once your top is pieced.