SeeMyQuilt
Free calculator ยท Triangles & units

Snowball block calculator

A square with stitch-and-flip corners. Enter the finished block size and how big the corners should be.

Per block1 square 9 1/2"
  • plus 4 corner squares 3 1/2"
  • For 12 blocks: 12 large squares and 48 corner squares
  • A corner one third of the block makes the snowball meet a nine patch exactly

How it is calculated

Draw a diagonal line on the back of each small square. Place one on each corner of the large square, sew on the lines, trim 1/4" outside the seams and press the corners open.

The large square is cut 1/2" bigger than the finished block. The corner squares are cut 1/2" bigger than the finished corner.

Questions

What corner size should I use?

For a snowball that alternates with a nine patch, make the corner one third of the block: 3" corners on a 9" block.

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