Half square triangle quilt blocks, also referred to as HSTs, are used in traditional, modern and contemporary quilts. They can be made in any size, and there are a variety of methods to make them. HSTs are used in hundreds (if not thousands) of traditional quilt blocks. In this article, we’ll show you the step-by-step method for making half square triangles two at at time.
It’s almost easier to make two half square triangles at time, than to make only one! It’s super easy and you are not matching two bias edges that can stretch when cut. With this method, you are handling fabric cut on grain and only sewing two seams on the bias and then cutting apart to make two half square triangles.
Half Square Triangles Two (2) at a Time Calculator:
If you want 3″ finished blocks, start with 3-7/8″ squares. Always cut your fabrics 7/8″ larger than the finished block size. The calculation is (finished size of square + 7/8) = cut fabric for 2 half square triangles.
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- 1″ finished block, cut 1-7/8″ squares
- 1-1/2″ finished block, cut 2-3/8″ squares
- 2″ finished block, cut 2-7/8″ squares
- 2-1/2″ finished block, cut 3-3/8″ squares
- 3″ finished block, cut 3-7/8″ squares
- And so on . . .
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