Setting Triangles Calculator
For quilts set on point: enter your block size and get the squares to cut for side and corner triangles, with the grain running the right way.
Side triangle squares
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In the app, this also gives you
- A full on-point quilt plan
- Sashing handled automatically
- The whole cut list, exportable as PDF
Why setting triangles are cut from two different squares
On an on-point quilt the outer edges must sit on the straight grain, or they stretch. Side triangles come from a square cut block × 1.414 + 1 1/4", cut on bothdiagonals so each of the four triangles has its long edge on grain. Corner triangles come from a square cut block × 0.707 + 7/8", cut on one diagonal. If your layout has sashing, the triangles must span the block plus its sashing — this calculator handles that for you.
More on the geometry: block sizes and on-point settings.
There's more where that came from
The app designs the whole on-point quilt — blocks, sashing, setting triangles — and hands you the finished size and complete cut list.
Coming to the App Store for iPhone and iPad.