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Thread: 8 1/2" Nine Patch Block

1. 8 1/2" Nine Patch Block

Hi,

Can anyone tell me what size blocks I would need to make a finished 8 1/2" nine patch block. If possible I will try to use strips, but I can't figure out what the width of the strips need to be to get a finished 8 1/2" block after sewn together.

The closest I came up with was 3 inch strips, three sewn together would give me a finished 8" block, I am not sure that is correct.

2. I think 3-3' would give you a 71/2 "....3- 3 1/2" would give you 9"...3 - 3 1/4 would give you 8 1/4. Soooo ....maybe 3 3/8????

I might do the 3 1/2 and trim????

3. 3 5/16 is what EQ7 says. Make a test one first to be sure.

4. Each strip would need to be 3.3333 inch. If I calculated correctly. 8.5 plus .25 time 2 for each block equals 10 inches.
10 divided by 3 equals 3.33333333333333333333333333

5. Just do 3.33333333 and sew a scant bigger seam

6. Trimming would make only the outside squares smaller

7. 3 1/3 is correct, but are you sure you want the block to be 8.5" finished? You mentioned that you thought three 3" strips would give you 8" finished, but that's incorrect; each 3" strip would be 2.5" finished, so you would get a 7.5" finished block, 8" unfinished.

For any FINISHED block size, if you want a 9-patch you need to divide the FINISHED block size by 3, then add 1/2 to get the strip size. Conversely, for any strip size, subtract 1/2 and then multiply by 3 to get the FINISHED 9-patch block size. For instance, for an 9" FINISHED block you need to divide 9 by 3 (giving 3) and add 1/2 (giving 3 1/2).

8.5 is a very unusual size for a finished block. Nothing really goes into 8.5 very nicely. If you look at Marcia Hohn's Quilter's Cache site, you won't see any blocks that are 8.5".

8. Originally Posted by mucky
Just do 3.33333333 and sew a scant bigger seam
Don't sew a bigger seam, because you really do want the strips to be exactly 3 1/3 inches, using 1/4" seams, to get a block that is 8.5" finished.

9. This was IMMENSLY helpful and timely for me! Thank you all, especially dunster! The reason I require the oddball 8.5" finished nine-patch block, is that I'm cutting multiple fat quarters into four 9" square blocks which will be alternated with nine-patch blocks to make a patchwork-looking picnic blanket. Thanks to you all...

10. Dunster - thank you so much. I am a little rusty in my 'quilter's math' and that last block I made, I had to draw it out to make sure that I had the correct block size for a donation block. I was thinking of making some 9 patches next and your directions were very timely

Sylvia

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