Making the disappearing 9 patch...
 

I can't find anywhere what size to cut the squares to end up with a 10" or 12".. Most of what I read says "cut any size you want."
Any help?

Let me see how my math is this morning:
5 inch squares will leave 4.5" after seam allowance (4.5 x 3 = 13.5" finished square) I figured 3 across and 3 down. Now cut that again into 4 and sew back together - these squares will be 6 inch (not counting seam allowance - you will end up with a 12 inch square.


Hopefully I did my math correctly. I love using larger beginning squares for this.

I have this chart which comes in handy:

Thanks for the chart!!!!

(assuming 1/4 inch seams and pieces are cut accurately)

A basic formula

Finished size plus 2 inches
Divide that number by 3

Example:

In the attached example, I would end up with a 4 inch finished unit.
I cut each of my squares at 2 inches (2 x 3 = 6)
I "lost" 2 inches to seam allowances


I would cut the squares 4 inches to get a 10 inch finished unit
I would cut squares 4-2/3 inches to get a 12 inch finished unit

Great reasoning and charts everyone ... most helpful. I also thank you!

You will end up with a 13 inch "finished" square if you start with 5 inch squares
What happens:
The original corner squares will still "finish" at 4.5
The center side cut squares lose 0.5 inch and now "finishes" at 4.0
4.5 + 4.0 + 4.5 = 13.0

Part 2 of my original post:

What one would "see" after cutting the 9 patch apart and sewing it back together.

Thanks, everyone! I knew I would get an answer quickly… Yeah….. The chart will come become very handy.
Thanks again…….

GREAT post Onebyone with posting that chart. That is going to be one of the best references I will use.

I was just thinking of making my first D9P for a charity quilt--thanks so much for the chart!!!

I love it when someone does all the math so I don't have to.

I'm thinking of trying this with 10" squares. Guessing that would make 4 lg squares & a quilt top around 50-52 inches.
Does that sound right? Have a couple of layer cakes that I now don't know what to do with & thought this would be a quick way to use them. What are your thoughts?

Thanks for the chart, it will save alot of time & frustration lol ...jj

Refer to the graph paper post. Perfect example of when.
MK

Oh, you quilters are Wonderful....thanks for sharing all of your knowledge for the beginners.

Thank you Onebyone for the chart. Saved, filed, and ready for reference! My brain has been put into Ahhhhhh mode. It won't have to struggle with the numbers quite as much. Tee-Hee-Hee!

Thank you very very much!!

One by One, thanks for the chart. It will come in handy and will share with my sewing group.

wow! Thanks for this info. I printed it, put it in a plastic page protector, saved it to my computer and I just now thought to pin it. This is a keeper for sure.

Thanks for the info.

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OneByOne
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Thanks for the chart.
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Isee the chart but I can't get it to print.

The chart will be really helpful. A friend and I are planning this quilt. Thanks.

Just printed it out and wow what a life saver this will become to make any size we want.
THANK you Onebyone

This chart is wonderful!! Thank you, thank you, for posting the link!

Nice D9P chart. Thanks,

This is the way I make mine.