🧶StitchCalc

Half Square Triangle (HST) Calculator

Calculate starting square size and fabric needed for half square triangles.

HST Specifications

Size when sewn into quilt

HST Method Reference

MethodFormulaHSTs MadeBest For
2-at-a-timeFinished + 7/8"2Small batches
4-at-a-time(Finished × 2) + 1.25"4Medium batches
8-at-a-time(Finished × 2) + 1"8Large batches

HST Tips

  • • Cut slightly larger and trim to perfect size
  • • Press seams to the darker fabric
  • • Use a square ruler with diagonal line for trimming
  • • Chain piece for efficiency
  • • Make a few extras in case of mistakes
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