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Formula To Figure How Much Fabric Is Needed? (rag quilt)

Formula To Figure How Much Fabric Is Needed? (rag quilt)

Old 09-27-2010, 11:31 AM
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Newbie back again with more questions. (this is my first quilt) I just realized that my rag quilt is going to be rather tiny for my 10 year old who is 5'5" tall.

I had bought two "kits" which have 42, 6.5" blocks each. I bought two kits thinking I would use one for the front and one for the back. Now, I am afraid it will be way too small. :oops:

So, I am thinking I will just use the two kits for a total of 84, 6.5" blocks for the front - BUT now I need backing. Is there a formula somewhere that explains how much fabric one would need for 84, 6.5" blocks? (math unfortunately is not my strong suit)

I will post a pic of the fabrics for the top -- I am thinking for the back maybe a pink/white polka dot??? Or maybe even pink/black polka dot???

THANKS so much for your help again!!
Attached Thumbnails attachment-113176.jpe   attachment-113177.jpe  
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Old 09-27-2010, 11:44 AM
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If I calculate correctly you can get 6 squares out of a 6.5" strip, so you would need 14 strips which equal 91", so a minimum of 2 2/3 yards if your fabric is 42" wide.
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Old 09-27-2010, 11:48 AM
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go to fabricdeli.com this might help you some. Just read on down the page, if it doesn;t help we will go amother way or just yell for help like you did.
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Old 09-27-2010, 11:49 AM
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So, it sound like you are attempting to make a quilt without any pattern. It is hard to determine fabric needs without having the finished size of the quilt. If your "unfinished" blocks are 6 1/2" than you finished blocks will be 6".

You can take pieces of 6" square paper & lay them out to get the dimensions of the quilt you would like to end up with. Once you determine the size of the quilt top, you can then calculate how much you need for backing.

Do you want to have an outer border? If no outer border, just add 1/2" to width & add 1/2" to length. Also, I cut my backing pretty close, but if you are a new quilter, you might want to add an additional couple inches to the backing piece.
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Old 09-27-2010, 11:53 AM
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Originally Posted by donnajean
So, it sound like you are attempting to make a quilt without any pattern. It is hard to determine fabric needs without having the finished size of the quilt. If your "unfinished" blocks are 4 1/2" than you finished blocks will be 4".

You can take pieces of 4" square paper & lay them out to get the dimensions of the quilt you would like to end up with. Once you determine the size of the quilt top, you can then calculate how much you need for backing.

Do you want to have an outer border? If no outer border, just add 1/2" to width & add 1/2" to length. Also, I cut my backing pretty close, but if you are a new quilter, you might want to add an additional couple inches to the backing piece.
She will need 84, 6.5" squares for the back. The same amount as she has for the front.
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Old 09-27-2010, 11:54 AM
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84 blocks/units -

possible layouts - 9x9 - which would use 81 blocks -

if your blocks will be 5.5 inches finished size (1/2 inch seam allowances) - that will be approximately 49.5 x 49.5 inches finished (think 50 x 50 because the outside fringe/rag will probably lay kind of flat)

Another layout - 8 blocks wide by 10 blocks long - would use 80 blocks/square/units

5.5 inch "finished" size - this would end up being approximately 44 inches wide by 55 inches long.

Your daughter is 65 inches long/tall.
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Old 09-27-2010, 12:32 PM
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If this is a true rag quilt, and the blocks are 6 1/2", your finished block would be 5 1/2" as you typically use a 1/2" seam allowance.

Are you planning on ragging the seams? If so, these measurements will need to be recalculated :wink:
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Old 09-27-2010, 12:54 PM
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Originally Posted by amma
If this is a true rag quilt, and the blocks are 6 1/2", your finished block would be 5 1/2" as you typically use a 1/2" seam allowance.

Are you planning on ragging the seams? If so, these measurements will need to be recalculated :wink:
Which ones?
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Old 09-27-2010, 02:41 PM
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Thanks everyone for all the helpful information and responses!!
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Old 09-27-2010, 02:50 PM
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I also need came up with 14 strips - Six 6.5 squares per strip x 14 strips = 84 squares

Theoretically, 91 inches should be "enough" but I would buy at least 100 inches (another 1/4 yard) for wiggle room.

99 inches = 2-3/4 yard
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