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Never trim your HSTs again!

Enter information about how many half-square triangles (HSTs) you need to convert any pattern from an annoying traditional method to the quick and easy strip piecing method.


The calculator will tell exactly what strips to cut and how much yardage is needed. Follow the instructions in my HSTs by the strip cheat sheet or on my blog to learn how to quickly cut HSTs from strips and  . . .


. . . never trim your HSTs again!

Subscribe to my newsletter to get free access to the calculator and HSTs cheat sheet.
You'll also get monthly tips and tricks to help you level up your quilting without all the annoying steps . . . like trimming!

If you're already a newsletter subscriber, you aren't going to receive any additional emails (besides the HSTs cheat sheet if you don't already have it). This just gives you access to the calculator.

Subscribe to get access

Cut the number of strips indicated in each fabric in the HST.

In general, the strip piecing method uses less fabric than any traditional HST method.

If you bought the fabric listed in the fabric requirements for your pattern (assuming there was no error), you should have more than enough fabric.


  • Unfinished size = finished size + 1/2" 

       This leaves room for the seam allowance.

  • Most yardage is 42" width of fabric

  • Most fat quarters are 21" width of fabric​​

  • 0.125 = 1/8

  • 0.25 = 1/4

  • 0.375 = 3/8

  • 0.5 = 1/2

  • 0.625 = 5/8

  • 0.75 = 3/4

  • 0.875 = 7/8

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