The quarter square triangle quilt is a very simple but quite striking when fabrics with a strong contrast are used. I’ve seen this design on vintage quilts before now and what struck me about it was the way the triangles are facing: on the sides the dark triangles face outwards but on the top and bottom the dark triangles face inwards. What this means is that if you rotate the block next to this, you’ll have two rows of triangles facing the same way – almost like a sashing between the blocks. The quilt is made entirely from either half square or quarter square triangles and it measures 40″ square, making it a decent sized lap quilt. I have used 1 yard each of both the black and the white.
Cutting requirements for the quarter square triangle quilt
2.7/8″ squares: fifty six black, fifty six white
13.1/4″ squares: two black, two white
2.1/2″ strips for the borders: four strips each of black and white, cut across the width of fabric
Making one quarter of the quilt
Make half square triangles with the 2.7/8″ squares. Place a black and a white square with right sides together and mark a line along the diagonal. Sew a 1/4″ seam either side of the marked line and cut along the line. This will produce two half square triangle units which are 2.1/2″ squares. Sew these half square triangle units together first in pairs so that they create one larger dark triangle with each pair of squares. Then sew these larger triangles together in two rows of three triangles and two rows of four triangles. Put these to one side for the moment.
Place a black and a white 13.1/4″ square with right sides together and make two half square triangle units as above. Then take the two half square triangle units and place them right sides together. Place them so that the white of one square is against the black of the other square. Mark a line along the diagonal that crosses both white and black. Sew a seam 1/4″ either side of the marked line and when you cut along the line you will have two quarter square triangles which are both 12.1/2″ squares. You need one of these for each quarter of the quilt.
Sew one strip of three small triangles to the top and one to the bottom of the quarter square triangle unit. Sew one strip of four small triangles to each side. Note that the black triangles at the top and bottom of the block are pointing outwards and the black triangles on the sides are pointing inwards. This means that you are sewing the black edge of the strips to the big white triangles and the white edges of the strips to the big black triangles.
Completing the quarter square triangle quilt
Make four blocks the same and sew them together in pairs. Notice that the quarter square triangles are rotated so that in each pair of quilt blocks the big black triangles are horizontal in one of the blocks and vertical in the other one.
Sew the two pairs of blocks together, checking the photo to see that you have the horizontal quarter square triangles diagonally opposite each other.
I’ve added two borders to this quilt, both made from 2.1/2″ strips. The first border is made from black strips. You will need two lengths of 32.1/2″ for the top and bottom of the quilt and two lengths of 36.1/2″ for the sides. The second border is made from white strips. You will need two lengths of 36.1/2″ for the top and bottom of the quilt and two lengths of 40.1/2″ for the sides.
The quarter square triangle quilt top is now complete and ready for layering, quilting and binding. You can find full details of these steps in the beginner quilting section.
Here’s the video: