Cut These Pieces
For 1 block
Center squares
Cut 1
4 1/2" × 4 1/2" each
Corner squares
Cut 4
2 1/2" × 2 1/2" each
Each block should measure 4 1/2" unfinished after assembly.
Stitch-and-flip: mark the diagonal, sew on the line, trim about 1/4" beyond it, then flip and press.
Common Square-in-a-Square Cut Sizes
| Finished Block | Center Square Cut | Corner Square Cut |
|---|---|---|
| 2" | 2 1/2" | 1 1/2" |
| 3" | 3 1/2" | 2" |
| 4" | 4 1/2" | 2 1/2" |
| 5" | 5 1/2" | 3" |
| 6" | 6 1/2" | 3 1/2" |
| 8" | 8 1/2" | 4 1/2" |
How This Estimate Works
This calculator uses stitch-and-flip folded corners with standard 1/4" seams. It does not cover loose triangles, paper piecing, specialty rulers, or trim-to methods.
FAQ
Finished size is the part you see after the block is sewn into the quilt. The unfinished block is 1/2 inch larger to include the standard seam allowance.
Patterns may use a different construction method, seam allowance, or trimming step. Follow the pattern when it gives its own cutting instructions.
No. It supports only the stitch-and-flip, folded-corner method with standard 1/4-inch seams.
Sew on the marked diagonal line. Afterward, trim the outer corner so about a 1/4-inch seam allowance remains.