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# 8 1/2" Nine Patch Block

02-16-2013, 03:45 PM
#1
Super Member

Join Date: Oct 2010
Location: Waupaca Wisconsin
Posts: 1,302
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.
02-16-2013, 04:03 PM
#2
Senior Member

Join Date: Sep 2010
Posts: 833

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????
02-16-2013, 04:14 PM
#3
Super Member

Join Date: Sep 2010
Location: Keller, TX
Posts: 7,417

3 5/16 is what EQ7 says. Make a test one first to be sure.
02-16-2013, 04:16 PM
#4
Senior Member

Join Date: Sep 2012
Location: Kankakee County in Illinois
Posts: 494

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
02-16-2013, 04:25 PM
#5
Super Member

Join Date: Feb 2011
Location: S. Texas
Posts: 2,337

Just do 3.33333333 and sew a scant bigger seam
02-16-2013, 05:08 PM
#6
Super Member

Join Date: Feb 2011
Location: S. Texas
Posts: 2,337

Trimming would make only the outside squares smaller
02-16-2013, 05:13 PM
#7
Power Poster

Join Date: Mar 2009
Location: Lake Elsinore, CA
Posts: 14,200

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".
02-16-2013, 05:14 PM
#8
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Join Date: Mar 2009
Location: Lake Elsinore, CA
Posts: 14,200

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.
02-26-2013, 07:28 PM
#9
Member

Join Date: Feb 2011
Location: Sun Lakes, AZ
Posts: 35

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...

Last edited by kaleda; 02-26-2013 at 07:29 PM. Reason: clarification
02-26-2013, 08:21 PM
#10
Junior Member

Join Date: Feb 2013
Location: Central Maryland
Posts: 230

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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