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# half square triangles

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redfish21 posted on Sat, Sep 27 2014 6:29 AM

I like the way to make half square triangles by cutting out a square, sewing 1/4" on all four sides and then cutting diagonally both ways. I just don't know how big to cut the squares to get the size you need. If I needed 3 1/2 " half square triangles what size would I need to make the original square and so on.  Hopefully someone knows the math for this.

Alison

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Marie replied on Sat, Sep 27 2014 7:47 AM

Alison, I know there is a tute on this on MSQC, where I learned this method, hope someone comes up with the URL for you, hang in there and I'm sure you'll get your answer.

Millbury, MA

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Ramona replied on Sat, Sep 27 2014 8:09 AM

duplicate post

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Ramona replied on Sat, Sep 27 2014 8:14 AM

redfish21,

I don't know the math on this but why don't you try making samples out of muslin. Maybe start with 4 1/2 or 5 inch squares and work from there. I think the quarter square formula was add 7/8 but maybe it doesn't work for your type of quarter square.  Here is a link for the 7/8.

http://www.karencombs.com/formulas_for_quilters.htm

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Elizabeth replied on Sat, Sep 27 2014 9:10 AM

Connecting Threads has a tutorial on how to make it that way with the math at the end.  Sorry I couldn't get the url to paste

#### From Sunny Southern CA

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Elizabeth replied on Sat, Sep 27 2014 9:15 AM

Sorry that was the wrong site, now I can't find the right one

#### From Sunny Southern CA

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Judy T-Bellingham replied on Sat, Sep 27 2014 9:38 AM

Alison. A 5-1/4" square would give you a perfect 3-1/2" triangle using that method. But I'd cut the square 5-1/2" so you have some wiggle room when trimming it. I love the Quilt in a Day ruler for doing this. You can square up the HST perfectly before opening it.

In the beautiful Pacific Northwest!

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Ramona replied on Sat, Sep 27 2014 9:40 AM

Yippie! Judy to the rescue!!  Thanks Judy.

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Judy T-Bellingham replied on Sat, Sep 27 2014 9:56 AM

Wish I had a formula, but I just took squares of paper and started with a 6" square, folded it, Nope too big and on down until it came out right. There is a formula for making 8 HST but can't find one for this particular method of making 4.

In the beautiful Pacific Northwest!

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Ramona replied on Sat, Sep 27 2014 10:00 AM

Judy,

I don't  feel so bad now. LOL That was what I was thinking she could do is just make samples until she found what worked.  I did see the 8 HST tutorial.  At least you took the time to really help.

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Marie replied on Sat, Sep 27 2014 11:18 AM

Alison, go to Crafty and type in How to make 8 half-square triangles at once: the magic 8 method.

Millbury, MA

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Darlene replied on Sat, Sep 27 2014 8:32 PM

Alison, depending on how many HSTs you need with the same fabrics, the magic 8 method that Marie mentioned is really a good method.

The reason I like this vs. the 4 is because the magic 8 gives you 8 HSTs with no bias and the 4 cuts all your squares on the bias when finished.  I prefer to stay away from the bias when I can.

Good luck with your project.  Hope you post pictures when you are finished.  Always enjoy seeing what others are creating.

## Darlene

from Western New York

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redfish21 replied on Sun, Sep 28 2014 6:31 AM

Thanks guys. I did not know this method so this helps big time. I think most of my quilts have HST in them. The math for this is (unfinished size + 1/2") X 2. Can't wait to try this.

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