A QuiltPlan piecing reference
Quarter-Square Triangles Cheat Sheet
one seam, two cuts: sized for you
Layer two half-square-triangle units, seams nested. Sew a scant ¼″ on both sides of the opposite diagonal from the existing seam, then cut apart on that line. One pass yields two finished quarter-square-triangle units. Cut your starting squares by the chart below and skip the math.
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Cut your starting squares 1¼″ larger than the finished unit size.
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| Finished | Starting sq. |
|---|---|
| 1″ | 2¼″ |
| 1½″ | 2¾″ |
| 2″ | 3¼″ |
| 2½″ | 3¾″ |
| 3″ | 4¼″ |
| 3½″ | 4¾″ |
| 4″ | 5¼″ |
| 4½″ | 5¾″ |
| 5″ | 6¼″ |
| 5½″ | 6¾″ |
| 6″ | 7¼″ |
| Finished | Starting sq. |
|---|---|
| 6½″ | 7¾″ |
| 7″ | 8¼″ |
| 7½″ | 8¾″ |
| 8″ | 9¼″ |
| 8½″ | 9¾″ |
| 9″ | 10¼″ |
| 9½″ | 10¾″ |
| 10″ | 11¼″ |
| 10½″ | 11¾″ |
| 11″ | 12¼″ |
| 11½″ | 12¾″ |
Fabric A — feature
Fabric B — light
Fabric C — dark
Want the full combination chart? See the Quarter-Square Triangles reference sheet.
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