Need Help With D4P Please
02-25-2016, 06:11 AM
#2
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02-25-2016, 06:29 AM
#3
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Join Date: Oct 2011
Location: Portland, Ontario, Canada
Posts: 413
I have a chart that says a full size quilt ((55x75) needs 165 blocks. The layout is 11 x 15 blocks. Another chart I have says that you can get 49 5" squares from 36" fabric and 63 5" squares from 45" fabric. I would post the charts but unfortunately, I don't have the link.
02-25-2016, 06:43 AM
#4
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Join Date: Jan 2015
Location: Central Virginia
Posts: 1,120
try this--determine the size that you want the finished quilt. 44X60 is good so you don't have to piece the backing. Then divide those two numbers by 5. You will lose 1/2 inch at each seam but you can then easily add a border to come up with the perfect size. I make a lot of these for Project Linus and really it's not necessary that the size be exact. Give yourself some freedom to enjoy the process!
02-25-2016, 09:47 AM
#7
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Location: Lake Elsinore, CA
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To make sense of the math:
You're starting out with 5" squares, like you find in a charm pack. Finished, each square would be 4.5".
When you make a 4-patch of the squares, you lose .5" in the seam (.25" of each fabric) in each direction, so you have a block of 9.5" unfinished, 9" finished.
You now make 2 cuts in each direction in the blocks and sew them back together. You lose .5" for each of the two seams, so your block is now 1" smaller - 8.5" unfinished, 8" finished.
Now comes the imprecise part. How big is a lap quilt? Take the width and divide it by 8", and round up or down (your choice) if necessary. Do the same for the length. Multiply these two numbers, and that's how many D4P blocks you need. If you're going to have a border, only use the width and length of the center of the quilt in these calculations.
For instance if you want your quilt to be 64"x64", without a border, you need to have a layout of 8x8=64 D4P blocks. This would use 4*64=256 of your original 5" squares.
You're starting out with 5" squares, like you find in a charm pack. Finished, each square would be 4.5".
When you make a 4-patch of the squares, you lose .5" in the seam (.25" of each fabric) in each direction, so you have a block of 9.5" unfinished, 9" finished.
You now make 2 cuts in each direction in the blocks and sew them back together. You lose .5" for each of the two seams, so your block is now 1" smaller - 8.5" unfinished, 8" finished.
Now comes the imprecise part. How big is a lap quilt? Take the width and divide it by 8", and round up or down (your choice) if necessary. Do the same for the length. Multiply these two numbers, and that's how many D4P blocks you need. If you're going to have a border, only use the width and length of the center of the quilt in these calculations.
For instance if you want your quilt to be 64"x64", without a border, you need to have a layout of 8x8=64 D4P blocks. This would use 4*64=256 of your original 5" squares.
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