Friday, February 25, 2011

HST Math--follow-up from the last post

After posting about the new HST method I'm using, I was asked about the math.  My husband, who is far more savvy at Excel than I, whipped up an equation for me to plug the numbers into.

The first number listed is the size of your original sewn squares prior to cutting the HSTs. The second number is your unfinished HST size.  If you are starting with 5" charm squares, you will make four 3.18" HST from a pair of charms.  It's likely you would trim this down to 3".  I left the actual measurements intact to help people decide which size they really need considering trimming to size.

All sizes shown are in inches.

Beginning Square Size Unfinished HST Size
3
1.77
3.5
2.12
4
2.47
4.5
2.83
5
3.18
5.5
3.54
6
3.89
6.5
4.24
7
4.60
7.5
4.95
8
5.30
8.5
5.66
9
6.01
9.5
6.36
10
6.72

10 comments:

  1. You and your husband are FANTASTIC!

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  2. Wow. Thank you! This little chart rocks! I am definitely bookmarking this :)

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  3. This EXACT question woke me in the middle of the night a couple of nights ago and I unsuccessfully attempted the "math" in my head while laying in bed. :) Thanks for the chart. It'll come in SO handy! YAY!

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  4. Thank you so much...and make sure to tell your husband thanks...from this quilter!!

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  5. Thank for the chart. I'll have to put it to good use.

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  6. I have all my math formulas in a little booklet I call my Quilter's Bible that I use nearly every day to figure for HSTs and QSTs, Flying Geese, Binding, Side Setting triangles (that one is ((FS x 1.414) + .5) cut diagonally twice) and how to calculate binding for a circular quilt (pi + about 8"). What a great idea to put it in Excel and just push a button each time you need to know the math... Great suggestion!

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  7. I think this chart just saved me a bunch of fabric. Thank you!

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  8. Kati, you are so awesome! I remember you posting your hst method a long time. I making a mini quilt and want to make a few small pinwheels and I going to use that method. Well anyway, I came back to your blog to see if you posted anything about size and found this! This is perfect! Thank you! I've bookmarked it now!

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