Choose the finished size for your square in a square quilt block or unit.
Square in a square quilt block sizes.
Triangles on the square.
Cut four corner patch fabrics equal to the finished size of the block divided by 2 and add 1 2 for seam allowances.
2 2 2 1 3 8 3 3 2 2 1 8 4 4 3 2 5 5 3 3 6 6 4 4 8 8 1 2 5 5 5 8.
It is the part that will be the center square in the finished square in a square block.
Now you will cut squares of fabric to make the 4 corner triangles of the square in a square block.
Thus for a 6 finished block your corner squares will be cut 3 5 inches.
For example if the finished size of your block unit is 4.
I tend to think of this as a traditional method but there are several others that can wear that hat as you will see.
For square in a square units remember.
Pin one smaller square on each corner of a larger square with the right sides together.
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.
Cut 2 squares cut in half on diagonal.
Cut the center square fabric equal to the finished block size plus 1 2 for seam allowances.
The corner triangles sizes below are larger than they should be so you can square them down.
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.
Stitch a diagonal line across each smaller square sewing across each corner of the larger square.