# Thread: HST Formula

1. ## HST Formula

Hi
Does anyone know how I can apply Jenny's fast hst technique to other sizes of blocks? The method I am speaking of is where Jenny takes two blocks, sews entirely around the perimeter and then cuts diagonally to yield multiple blocks. I am particularly interested in how to accomplish this technique for a pattern which calls for cutting a block 3 7/8 inches to arrive at a 3 inch finished block. Is there a general rule of thumb?
Thanks!
Sue  Reply With Quote

2. ## Re: HST Formula

I think with that method you add one inch to the size you want the finished block to be, so 3" +1" = 4. Cut your two squares 4", sew around the perimeter, do your criss cross cut and your new square should be 3". If a pattern calls for 7/8 in the measurement I cut to the next full inch and square up. Easier to modify a block slightly too big than short. I am no math genius but this is how I would do it. Other people who are more technically minded and really good at math might say my answer is wrong. So I would advise making and measuring a test block from scraps first. And wait and see how many other answers you get here.  Reply With Quote

3. ## Re: HST Formula

HSTs using Jenny's method - beginning and ending sizes. 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

And going the other way - what size original squares are needed to end up with certain size HSTs:
#" Squares (2) = #" HSTs (4)

1.7" Squares = 1.0" HSTs
2.4" Squares = 1.5" HSTs
3.1" Squares = 2.0" HSTs
3.8" Squares = 2.5" HSTs
4.5" Squares = 3.0" HSTs
5.2" Squares = 3.5" HSTs
5.9" Squares = 4.0" HSTs
6.6" Squares = 4.5" HSTs
7.3" Squares = 5.0" HSTs
8.0" Squares = 5.5" HSTs
8.7" Squares = 6.0" HSTs
9.4" Squares = 6.5" HSTs
10.1" Squares = 7.0" HSTs
10.9" Squares = 7.5" HSTs
11.6" Squares = 8.0" HSTs
12.3" Squares = 8.5" HSTs
13.0" Squares = 9.0" HSTs
13.7" Squares = 9.5" HSTs
14.4" Squares = 10.0" HSTs
15.1" Squares = 10.5" HSTs
15.8" Squares = 11.0" HSTs
16.5" Squares = 11.5" HSTs
17.2" Squares = 12.0" HSTs  Reply With Quote

4. ## Re: HST Formula

Phew, those are two really impressive charts. I believe you just have to be careful ironing your HSTs made this way since there'll be some bias. Anyone can correct me if I'm wrong...  Reply With Quote

#### Tags for this Thread

hst #### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•