How to Sew Quarter Square Triangles

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Quarter-square triangle quilt blocks are blocks that consist of four equal triangles. You can use any mix of patterns and colors for the triangles. Use two different fabrics and vary the placement of them when sewing them together or use four different fabrics. In this YouTube Video, designer Nancy Wilson shows you how to sew quarter square triangles using her tool, the Whirlwind Whiz.

As Nancy demonstrates, sewing quarter square triangles is super simple with the help of the Whirlwind Whiz tool and the Mega Whirlwind Whiz tool, which is a larger version of the Whirlwind Whiz tool.

quarter square triangles

We love all the inspiring quilt patterns incorporating quarter square triangles we have been seeing lately.

quarter square triangles

Southwest Charm Table Runner

Here are a few more tips for sewing quarter square triangles:

  • When cutting, square up the fabric. Cut the fabric in strips as wide as the desired finished width of the triangle-squares, plus 7/8” for seam allowances. For example, for a 3” finished half-square triangle, cut a 3-7/8”-wide fabric strip.
  • If you are relatively inexperienced with making quarter square triangles, consider taking on a smaller project, such as a pillow cover. The jeweled pillow cover shown below is interchangeable so you can alternate between covers to redecorate any time you get the urge.
  • By mixing half square triangles with quarter square triangles you can create a Pinwheel on Point block.
  • When piecing a block using quarter square triangles, carefully consider the bias edges. Traditional blocks are by sewing four triangles together so you are making a block with lots of bias edges. Avoid stretching the fabric when sewing.  
  • Mix and match prints and solids when creating with quarter square triangles for more depth and interest in your quilting projects.
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Ellies Garden Quilt Pattern

The quarter square triangle block is a traditional yet fun block to create. Have you made projects using the quarter square triangle? Share them with us!

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