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The Great Wedding Quilt Project  Part Two: Quilt Math

5/8/2021

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In The Great Wedding Quilt Project - Part One, I said that the quilt pattern had been identified and purchased AND that the largest quilt size was a double but my niece wants a queen size quilt.  In this blog post I am going to cover, in general how to change the size of a quilt, not change the size of the blocks.

For making any quilt larger, you have to know how many extra blocks you need. Normally that could be as simple as adding an extra row and column - kind because the column has to take into account that extra row. But this quilt has the blocks set on point so it is a bit more complicated.  You have to figure not only the full blocks but the half blocks along the sized plus the quarter sized blocks that go in the corners

Once the number of extra blocks is known, then the number pieces (squares, rectangles, full, half and quarter triangles, etc.) that make up the block can be calculated. From those numbers the amount of fabric in square inches or millimeters is created. And finally, the yardage can be determined.

Now, with my engineering background, doing this math, using Microsoft Excel for the calculations (not taking any chances especially since I am dyslexic) is easy for me; you might think --
                                   WTF, I don't even know where to start to do all that math!!!
​Have no fear, there are books for this!! 
Go to your favorite on line book seller and enter "quilt math" and over 2 dozen books will be listed. This is my favorite which I bought in the 1980's and is still published today  - Taking The Math Out of Making Patchwork Quilts.  

Its a great book that covers, straight and on-point sets, mattress sizes and quilt sizes for them; adding sashing, borders and more. Then it becomes easier to know the number of blocks and the yardage.

I would like to also mention that there are some websites that have quilting calculators. 

​Before using the books or a calculator, take a quilt pattern and run the numbers for a know size and verify the numbers align - remember the pattern may round up the yardage required.
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    About Laurie

    Laurie lives in central Texas with Erich, a.k.a. "the shop elf", her hubby of 35+ years and Cowboy Boots, the cat; her metals studio including 100+ hammers and 300+ chasing tools; her sewing studio which has a sewing machine, a closet filled with fabric, hundreds of skeins of embroidery floss and perle cotton, silk and other materials, and Mrs. King the dress dummy; two weaving looms, assorted knitting needles, tubs of yarn; lots of books; plus a plethora of geeky tech gadgets, computers, and more.

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