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Calculating yardage for D9P

Calculating yardage for D9P

Old 03-27-2010, 07:03 AM
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OK.. I got a few requests last night on calculating fabric for a D9P (Disappearing 9 patch), and let me tell you I have a new admiration for those who teach math!! I also preface this by letting you know that Algebra is the one subject I got VERY poor grades in .. got the answers right.. but couldn't show my work. So here goes...
This is how I calculated my queen/king sized top for my nephew (I'll show a pic at the end). I wanted simple numbers so I went with simple lowest common denominator. I made the squares for the 9 patch 5" each.. that is including seam allowance. For this Tute we are going to use Colors A, B, and C..
color A will be the 4 outside CORNERS of the beginning 9 patch block.. Color B will be the center 4 outside squares in the 9 patch.. color C will be the center square of the 9 patch.

Here we go
attachment-32664.jpe
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Old 03-27-2010, 07:14 AM
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Love the fishy fabric. Guess you are writing more instructions as we type.
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Old 03-27-2010, 07:23 AM
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A is the fishie fabric
B is the Green fabric
C is the Yellow fabric.

#1 for each block we are going to need 4 fishies... 4 greens .. and 1 yellow.
#2.. this quilt is going to be queen/king sized.. so we're going to make it 6 blocks across and 7 blocks long.. that's 42 blocks total.
#3... for Color A we will need 168 of the 5" squares.. you get that by taking the 4 squares/block and multiplying by the number of blocks.
With me so far?? :thumbup:
Now comes the fun.
Figuring we're using 45" fabric we're going to be conservative and say we can get 40" (across) of usable fabric after taking off the selvages. Soo that means we can get 8 of the 5" squares across the fabric..
Now you take that 8 and divide it into the number of total squares you need of fabric A.. (168).. and that will give you 21.. that means you're going to need 21 rows of 5" squares. so if we multiply 21 x 5.. you will need 105" of fabric.. to cut out the squares for fabric A... and guess what.. you need the same for fabric B!!.. thank heavens finally something easy..lol...
Now for yardage we're going to divide 36" into our 105" needed and come up with 2 yards and 33 inches. Or as we all know 3 yards 'cause we're all about rounding up.
For Fabric C you need one square for each block.
That is 42 squares.. at 8 squares per row. we're going to take the 8 into 42 and get 5.2.. so since we're not into "fragments" of squares we're going to figure 6 rows. That is 6 x 5 or 30 inches of fabric.. so I would round up and spring for a yard of fabric. again giving myself some wiggle room for getting fabric straightened on the grain and allowing for poor cutting.. theirs and mine.
So far we've calculated that for a queen/king sized top we're going to need
Color A=3 yards
Color B=3 yards
color C =1 yard
Wasn't that easy????
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Old 03-27-2010, 07:48 AM
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OK.. now I know that many of you want borders and are saying.. yah... but I want borders..... Here is where my "creative" math comes in.. and I frequently rely on little diagrams for my own use.
OK.. for the 5" border request I had .. here goes. I like my borders cut from the lengthwise grain of the fabric when I can. For purposes of this tute.. we're going with that.
Going back to our original assumption of 40" of "working" fabric across we're going to need 4 strips of whichever fabric you want for your border.. We are going to say we're using color B for the border..so the total length of the quilt is going to be ... at the most... and that's the best way to figure.. better to have a little left over than not quite enough... 13.5" (size of finished block after cutting, spinning and re-stitching) times 7 blocks long.. or 94.5" PLUS.. 9.5" (borders less 1/4" seam allowance on each) or 104"
This is where I take a couple of shortcuts.. and I have to tell you .. I don't mind having a little fabric left over.. you still have to bind this quilt.. and can use the leftovers in a pieced back.
We know for a fact our longest border needs to be 104"
You need that off the side of the "usable yardage".. so that 4 of those 5" border strips are going to reduce our usable width from 40" to 20"..
out of 104" x 20" usable piece of fabric we can get 84 squares.. I got that by figuring how many rows (5" squares into 104" piece of fabric equals 21 (ok so it has to be 105" long)... then take that times 4 squares across which is 5" square into 20" width of usable fabric. multiply the number of rows we have by the number of squares across and voila.. you have 84 squares. OK so far?
Now we know that we still need 168 squares of this fabric.. so just take 84 from 168 and we need 84 more squares.. Back to method #1.. we can get 8 squares across the full 40" so we divide 8 into 84 and get 10.5 and once again rounding that up.. we need 11 rows of squares.. since we don't want to piece them.. so 11 x 5" will be an additional 55" of fabric.
Adding the 2 yardages needed we find that we need a total of 160" of color B or 160 divided by 36.. you would need 4 yards and 16 inches of that color.. might as well say 4.5 yards..
To summarize you need
Color A: 3 yards
Color B: 4.5 yards
Color C: 1 yard.
I hope this is understandable.. as I said.. I make no pretense of being a Math person.. but it works for me.
Other border sizes can be calculated in a similar fashion. If you need individual help just give me a shout.. this pattern is pretty easy to figure.. I'm not sure I'd be as comfortable to calculate for more complicated patterns for anyone else.

This is the one I made for my nephew.. no borders..
attachment-32676.jpe
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Old 03-27-2010, 08:40 AM
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Thank you so much for the tute for D9P. I have a hard time figuring out the math to make larger quilts. It seems as if even my G-Kids all have huge beds. lol Agan thanks for taking the time to help your quilting sisters and brothers on this board. :thumbup: :thumbup: Pam
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Old 03-27-2010, 09:25 PM
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THANK YOU, thank you, thank you!
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Old 03-28-2010, 04:16 AM
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Thank you. I just wish your tute had been here last year.... LOL..... when I was doing those 3 disappearing nine patch quilts. Making the quilts wasn't near so bad as doing the math! What a headache!!! Wound up having to buy a different fabric for the borders.....miscalculated on the amounts.
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Old 03-28-2010, 04:21 AM
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Thank you for the info!
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Old 03-28-2010, 09:26 PM
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Thank you Tippy! You are the greatest! I sure enjoy our live chats and you are so knowledgeable!
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Old 03-30-2010, 02:40 AM
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Thanks for the tutorial!!! :)
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