Double Square In A Square Quilt Block

An essential block in many larger quilt designs the square in a square block is comprised of one small square inside another and can sometimes be tricky to piece together as it requires some math.

Double square in a square quilt block.

Cutting calculations for a square in a square quilt block. Triangles on the square. A square in a square block is basically a square set on point so all the tips that apply to setting a quilt or block on point also apply to a square in a square block. Cut the center square fabric equal to the finished block size plus 1 2 for seam allowances.

Cut off the excess outside fabric and open up the squares to reveal the finished block plus seam allowance of 1 4 inch all around. To determine the size of the large square decide on your finished block size and add. Pin one smaller square on each corner of a larger square with the right sides together. Choose the finished size for your square in a square quilt block or unit.

For example our finished block size is going to be 4 inches so we simply add to that which equals 4. Cut four corner patch fabrics equal to the finished size of the block divided by 2 and add 1 2 for seam allowances. Stitch a diagonal line across each smaller square sewing across each corner of the larger square.