Jenny's HST method calls for placing two squares right sides together, sewing 1/4" seam all around, and then cutting on both diagonals to yield 4 HSTs from 2 squares. I have done the math to determine the finished HST size you will get from this method, and am fairly confident I am right, utilizing the Pythagorean Theorem. Don't forget - you can trim down the HSTs to make the size you need (though that would be an extra step).

2 squares = 4 HSTs

2" Square = 1.06" HSTs

2.5" Square = 1.41" HSTs

3.0" Square = 1.77" HSTs

3.5" Square = 2.12" HSTs

4.0" Square = 2.47" HSTs

4.5" Square = 2.83" HSTs

5.0" Square = 3.18" HSTs

5.5" Square = 3.54" HSTs

6.0" Square = 3.89" HSTs

6.5" Square = 4.24" HSTs

7.0" Square = 4.60" HSTs

7.5" Square = 4.95" HSTs

8.0" Square = 5.30" HSTs

8.5" Square = 5.66" HSTs

9.0" Square = 6.01" HSTs

9.5" Square = 6.36" HSTs

10.0" Square = 6.72" HSTs

10.5" Square = 7.07" HSTs

11.0" Square = 7.42" HSTs

11.5" Square = 7.78" HSTs

12.0" Square = 8.13" HSTs

2 squares = 4 HSTs

2" Square = 1.06" HSTs

2.5" Square = 1.41" HSTs

3.0" Square = 1.77" HSTs

3.5" Square = 2.12" HSTs

4.0" Square = 2.47" HSTs

4.5" Square = 2.83" HSTs

5.0" Square = 3.18" HSTs

5.5" Square = 3.54" HSTs

6.0" Square = 3.89" HSTs

6.5" Square = 4.24" HSTs

7.0" Square = 4.60" HSTs

7.5" Square = 4.95" HSTs

8.0" Square = 5.30" HSTs

8.5" Square = 5.66" HSTs

9.0" Square = 6.01" HSTs

9.5" Square = 6.36" HSTs

10.0" Square = 6.72" HSTs

10.5" Square = 7.07" HSTs

11.0" Square = 7.42" HSTs

11.5" Square = 7.78" HSTs

12.0" Square = 8.13" HSTs

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