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Thread: Quilt Math

  1. #1
    Member ClydeneC's Avatar
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    I had read that quilt math was easy and I would like to know where I could learn how to do the quilt math. I love to make quits with no patterns, but always buy too much fabric or not enough. Any help I can get I would so appreciate it.

  2. #2
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    So glad you asked the question because I also need help in this area. Thanks, Betty

  3. #3
    community benefactor Renee110's Avatar
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    There are quilter's calculators that calculate the yardage etc... needed for specific sizes....plus there are some online calculators that will do the math for you...just google online quilting calcs...

  4. #4
    Super Member Scissor Queen's Avatar
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    You don't need a fancy calculator. You can do quilt math with any calculator. It's mostly just multiplication and division.

  5. #5
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    Quilt math is basically:

    Looking at your block.
    Measuring each piece
    Determining square inches of that piece
    Multiplying the number of times that piece will be used
    Then convert to yardage.
    Yardage is calculated at 42"x36" With 42" being the average width of fabric.

  6. #6
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    To continue with math

    Say you want to do a 12" 9 patch for a queen quilt.
    Quilt is 96"x108" There will be a total of 72 blocks in the quilt. 96" divided by 12" and 108" divided by 12 = 72

    Each 9 patch block contains 9 squares finished at 4". So cut will be 4.5"
    4.5"x4.5" = 20.25 square inches.

    20.25 x 9 = 182.25 square inches each block
    182.25 x 72 blocks is 13122 total square inches.
    1512 square inches in a yd of fabric

    13122 divided by 1512 = 8.67 total yds.
    Now, assume you want to use two colors in your blocks then the 8.67 divided by 2 is 4.33 or little over 4 and 1/3 yd of each color. But add a half yard for miscuts.

    Calculating for binding.
    Measure around quilt = 408" width of fabric is 42"
    Divide 42 into 408 = 9.7 strips (make it 10 strips)
    If each strip is cut 2.5" then 2.5 x 10 is 25 inches of fabric for the binding.

    I woke up and couldn't sleep

  7. #7
    Super Member ghostrider's Avatar
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    If you want some guidance on quilter's math, Quilt University has a class that covers all of it. It's one of their most popular classes. The next class starts April 15th and it's three classes, plus a bonus lesson all for only $27. http://www.quiltuniversity.com/catalog.htm

  8. #8

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    I use a paper and pencil and sort of sketch out my idea. I then decide the size of the blocks or tectangles, etc. iI count to see how many I get in a yard and then count it up. Does this make sense?

  9. #9
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    Sorry you couldn't sleep - but we've all benefitted! My alegbra I teacher - bless her heart - would be laughing her head off right now if she knew I was quiling! She once told me to never, ever, attempt anything other than business math! :lol:

  10. #10
    Senior Member
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    One thing I do is I only use 40 as my width because I am finding too many pieces of quality fabric (LQS not chain stores) that after washing are less than 42. So I have learned to give myself a little bit of wiggle room. I might end up with some scraps, but I would rather do that than not have enough!

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