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  1. #1
    4 Patch Pro

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    Default how do I figure the ending size of half-square triangles?

    I want to make a baby quilt using a half-square triangle pattern, but I am not using pre-cuts. How do I figure out how big the ending squares will be when I sew two squares together and do either the 4-corner diagonal cut or the 2-corner diagonal cut??

    For example, if I use 8" squares, sew the perimeters together, and cut twice through the center ending up with 4 half-square triangles, how big will the squares be?

    Or if I sew twice down the middle, then cut inbetween those seams, how big will those 2 squares end up?

    I can't figure this out in my head. What is the math formula for this?

  2. #2
    Missouri Star

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    Default Re: how do I figure the ending size of half-square triangles?

    There must be a formula somewhere, but I don't know where. But when I am puzzled by math things, I take the hands on approach and cut scrap fabric to 8" square, make the HSTs and then measure. I keep my samples on a big safety pin in my sewing area, notes attached, and I can go back to see the actual block instead of a math computation! Click image for larger version. 

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    I know a brilliant mathematician will come along to provide a formula. Someone several years ago figured it all out and shared. Wish I knew where that is!
    Last edited by Jean Sewing Machine; June 26th, 2017 at 06:44 PM.

  3. #3
    Missouri Star

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    Default Re: how do I figure the ending size of half-square triangles?

    Here's a couple of suggestions.....I normally go to the internet to find out how to make these things !

    http://www.craftbuds.com/quick-triangles-baby-quilt/

    Here's another :
    http://www.diaryofaquilter.com/2015/...-tutorial.html

    Here's Another Idea :
    This is a Lattice Baby Quilt.....Really Nice !
    http://www.diaryofaquilter.com/2017/...-tutorial.html

    Of course you can always look on Craftsy.com
    https://www.craftsy.com/blog/2013/06...quilt-designs/

    Then too....MSQC has a lot of tutorials....
    Here's a Half-Square Triangle "Quilt Snips"
    https://quiltingtutorials.com/tutori...orial-easy-hst

    Jacqueline ( Sugar ) Dorer-Russell
    http:\\www.sugarssmilinpapercrafts.BlogSpot.com


    "I miss the me I was when you were here"

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  5. #4
    Missouri Star

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    Default Re: how do I figure the ending size of half-square triangles?

    Here's my go-to site for half square triangle size chart, it gives the sizes needed for 2, 4, and 8 triangles

    http://www.blossomheartquilts.com/20...maths-formula/

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  7. #5
    Missouri Star

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    Default Re: how do I figure the ending size of half-square triangles?

    Quote Originally Posted by Caroline T. View Post
    Here's my go-to site for half square triangle size chart, it gives the sizes needed for 2, 4, and 8 triangles

    http://www.blossomheartquilts.com/20...maths-formula/
    Great chart!

    We have talked about this a lot and the consensus (mostly) is to skip the fractions and round up and square up after. I don't want to look for 7/8'' on my ruler, what a pain.



    Lorie

  8. #6
    4 Patch Pro

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    Default Re: how do I figure the ending size of half-square triangles?

    Thanks Jean! That is a great idea!

  9. #7
    4 Patch Pro

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    Default Re: how do I figure the ending size of half-square triangles?

    Thank you Hulamoon/Lorie (not sure)! That's a great site for bookmarking! I think I've got it now.

  10. #8
    Missouri Star

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    Default Re: how do I figure the ending size of half-square triangles?

    Quote Originally Posted by StacyLSS View Post
    Thank you Hulamoon/Lorie (not sure)! That's a great site for bookmarking! I think I've got it now.
    It was Caroline that posted the chart, I just chimed in.



    Lorie

  11. #9
    Missouri Star

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    Default Re: how do I figure the ending size of half-square triangles?

    Many times I make HSTs using the old method of drawing a line diagonally & sewing 1/4" on either side of the line. If you use this method, you'll need to cut your squares at least 1/2" bigger than the size of the desired HST. I usually do 5/8" to allow wiggle room for squaring up the block. I square up every block.

  12. #10
    Applique Angel

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    Default Re: how do I figure the ending size of half-square triangles?


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