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I do not do math, but I need to know if there is a formula for figuring batting/backing needs. I usually just buy what fabric I THINK I need but that doesn't always work. I will be teaching a D9P class where some students will be making table toppers, others will be making runners-with & without borders-so nothing will be the same size. How can I tell the students how much backing they will need? Is there a math formula that will cut down on the amount of stash created from buying too much? Thanks for all your guidance.
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I'd be curious to know this; I'm awful at math myself (and I'm a programmer!) and often have to get my husband to help me figure this stuff out.
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the first thing you have to know is how big the top is
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Your LQS probably has a book called "Taking the Math Out of Patchwork Quilts" by Bonnie Leman and Judy Martin....an oldie but still goodie. We used to have one at every cutting table and at the front checkout in my shop....they were held together by tape because they were used so often!:D
A great resource! Amazon still has them used from $7.37. Jan in VA |
Length X width = area.
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Did I read your initial post correctly that your are going to teach a class and don't know how much batting and batting to tell the students to get?
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Originally Posted by Holice
Did I read your initial post correctly that your are going to teach a class and don't know how much batting and batting to tell the students to get?
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You probably don't have to get a whole book on the subject, if you have an Iphone there are apps out there that will do those calculations for you, plus all quilt stores have litle cheat sheet cards and stuff you can get and use. They are even on the internet, just print them out.
With regard to the length X width = area.....then what? Say a 49 X 56 quilt top = 2,744, what do you do with that 2,744 number to get it into yards or something figurable? |
if you are talking about a back with the fewest pieces...
regular fabric is usually 42" wide, but not including selvedges, use 40". if one dimension of your quilt is less than that, then just purchase the amount of the other dimension, allowing a few inches for squaring up. if you have to piece the back, how many widths of 40" do you need and then multiply the length by that number. HTH |
Joann's has a quilt calculator (about $40) that does the math for you. I've been saving up for one and waiting for it to go on sale.
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