A Quick Tip; Half Square Triangle Trimming

How much do you love half square triangle trimming?

I usually find it to be necessary and chalk it up to part of the process, but there’s no reason we can’t be smarter in how we work!

Half Square Triangle Quick Trimming Tip - AmysCreativeSide.com

I prefer to make the units slightly larger and trim to size, that way I know that they are perfect, not because I have to make things perfect. Perfect pieces makes sewing multiple units together so much easier, so I go through all the motions even when on a deadline!

Half Square Triangle Quick Trimming Tip - AmysCreativeSide.com

This trimming tip is best applied when you are using a high quality thread that doesn’t take up a ton of space in the seam allowance. My current fave is Aurifil 50wt. Line up the ruler on the seam as shown, and trim two sides before pressing open.

Since I had so many to trim, I put a line of tape on the ruler so I didn’t have to find the mark every time. If you are just making a few, find the unfinished size of your unit, and line up the ruler. These were trimmed to 3 1/2″

Before you know it you’ll have a pile of trimmings like this:

Half Square Triangle Quick Trimming Tip - AmysCreativeSide.com
Happy trimming & quilting!

By |2017-02-06T09:17:45-06:00December 28th, 2015|Sewing Tips!, Tutorial|12 Comments


  1. Karen December 28, 2015 at 12:17 pm - Reply

    Thanks so much, Amy! As a beginner, I can use all the help I can get, and I just love half square triangles. :)

  2. Kathy December 28, 2015 at 6:28 pm - Reply

    I love this tip. I hate trimming half-square triangles. This looks so much easier than what I have been doing. Thank you from Texas!

  3. Anja @ Anja Quilts December 28, 2015 at 7:10 pm - Reply

    I just recently learned this trick, and it’s the best one ever!!!

  4. Lynne S of Oz December 29, 2015 at 12:52 pm - Reply

    LOL, so obvious when you show it! Thanks!

  5. Teje December 30, 2015 at 9:34 am - Reply

    Thank you Amy for a great tip! I love to use triangels and never thought to trim them before opening. This helps a lot. Happy New Year! x Teje

  6. Ali M January 2, 2016 at 7:56 pm - Reply

    Oh wow, I wish I’d known of this tip before, thank you, resisting the urge to start a new quilt tonight just to try this out ;)

  7. Alisa January 5, 2016 at 8:54 pm - Reply

    Brilliant! And, I just trimmed 80 or so of these today. This would have saved some time for sure. Next time! Thanks.

  8. Karen @ Pieces of Contentment January 6, 2016 at 1:33 am - Reply

    Great tip Amy, cutting the time of trimming in half. Thank you.

  9. Phyllis Joyce January 13, 2016 at 8:48 am - Reply

    Great tip Amy. Phyllis Scotland

  10. Janelle March 24, 2016 at 4:45 pm - Reply

    Would aurifil 50 be a thinner thread??

    • Amy March 28, 2016 at 10:40 am - Reply

      Hi Janelle – thinner than?

      I like to use high-quality thin threads that don’t take up too much space in the seam allowance, once my seams are pressed open.
      Hope that helps!

  11. Elise January 6, 2019 at 12:32 pm - Reply

    Thank goodness for smart people like you! This is such a timesaver!!

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