My Favorite OLFA tools for making Half Square Triangles


Designer: Pat Sloan


I’ve been using OLFA tools since I started to quilt. It has been wonderful over the years to see the new tools and find great uses for them. Make sure you check out our giveaway at the bottom of the page and you can enter on Instagram @OLFA_Craft!


It’s thrilling to be asked to share my favorites tools for making Half Square Triangles.  The Sparkler quilt on the cover of my newest book is the block I’ll share. 



OLFA RM-12S 12" Rotating, Self-Healing Cutting Mat

OLFA 45mm RTY-2C/NBL Quick-Change Rotary Cutter, Navy

OLFA QR-6S 6 1/2" Square Frosted Acrylic Ruler

OLFA QR-6x12 6" X 12" Frosted Acrylic Ruler



Following the pattern in my book cut out your pieces.

We are making two half square triangles at a time.


Draw a diagonal line on one fabric.

Sew a 1/4” on either side of that center line.


Use the 6.5” x 12.5” frosted ruler to cut on the drawn line.


Press open and take the 6.5” square frosted ruler and line up the diagonal on the seam of the block.


Trim 2 sides

Then rotate the mat


Trim the other 2 sides


You now have perfect Half Square Triangles with ease!


Enjoy making your Sparkler quilt and share it with me at my community ‘Quilt Along with Pat Sloan at Facebook.

I’d love to have you join me at my Youtube channel.



*Giveaway!* Two luck winners will win:

  • OLFA 45mm Navy Splash Rotary Cutter
  • OLFA 12” Rotating Cutting Mat
  • OLFA 6.5" Square Frosted Ruler
  • Pat’s Holiday Celebration Book

To enter the giveaway check out our Instagram post at @olfa_craft and you can find my Holiday Celebrations book at your favorite quilt shops!