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
—
In the app, this also gives you
- Sashing width folded into the math
- Saved into your project's cut list
- Exportable as a PDF or CSV
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 shows the formula behind both triangle sizes, saves them into your quilt's cut list with the yardage, and exports the list as a PDF.
Coming to the App Store for iPhone and iPad.