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12-27-2010, 06:00 AM
#1
Member

Join Date: Dec 2010
Location: Maryland
Posts: 16

I have a pattern that I need help in deciding how much material to buy. I do not know how to calculate it. Can I get some help from anyone????
12-27-2010, 06:09 AM
#2
Senior Member

Join Date: Aug 2010
Posts: 601

Give us the info. I'm sure we can help. What is the pattern?
12-27-2010, 06:12 AM
#3
Member

Join Date: Dec 2010
Location: Maryland
Posts: 16

This is what is given on the quilt block. The block should measure 13"x13". I was looking at a 5 blocks across and 6 blocks lengthwise and add a side border maybe 3-5". A total of 30 blocks. The sewn block would come out to be 12.5"x12.5". Below are the sizes for a block. Maybe you can help me calculate how much material based on 45" fabric.

Light green print for background: (4) 3-3/8" x 3-3/8" squares; (9) 3" x 3" squares
Lightest green print: (2) 3-3/4" x 3-3/4" squares
Deepest purple print: (2) 3-3/4" x 3-3/4" squares (for quarter square triangle units)
Purple/multicolor print: (4) 3-3/8" x 3-3/8" squares
Medium paisley print: (4) 3" x 3" squares
Assemble the Providence Quilt Block
12-27-2010, 06:28 AM
#4
Senior Member

Join Date: Aug 2010
Posts: 601

First, since you want 30 blocks total (5 across x 6 high), you need to multiply the number of each piece needed by 30, so we have:

Light green print for background: (120) 3-3/8" x 3-3/8" squares; (270) 3" x 3" squares
Lightest green print: (60) 3-3/4" x 3-3/4" squares
Deepest purple print: (60) 3-3/4" x 3-3/4" squares (for quarter square triangle units)
Purple/multicolor print: (120) 3-3/8" x 3-3/8" squares
Medium paisley print: (120) 3" x 3" squares

Then, the fabric calculations:

light green: You should be able to fit (10) 3 3/8" squares per WOF (I'm always conservative here, to make sure you don't run out. You may have a bit extra). Since you need 120 of those squares, you will need 12 (120/10) WOF strips, cut 3 3/8" to get them all. 12 * 3 3/8 (plus a bit extra, so I'll use 4" ) is 48". You also need (270) 3" squares. You can get (13) 3" squares per WOF, so 270/13 = 21 (you need to round up here from 20.7 or so). 21 WOF strips 3" wide is 63". So, 48" + 63" is 111". If it were me, to account for issues in cutting and errors, I would buy 3 1/2 yards, rather than the 3 yards and 3 inches that is 111".

LIghtest green: You need (60) 3 3/4" squares. You can fit 10 per WOF, so you need (6) 3 3/4" strips. 6 * 3.75 =22.5". Again, being me, and planning for errors and squaring up fabric, I would buy 1 yard.

Deepest purple is same as lightest green above; I would do 1 yard.

Purple/multicolor print is the same as the light green for background above; you will need 48". I would probably buy 1.5 yards.

Medium paisly print: You need (120) 3" squares. You can fit 13 per WOF. 120/13 is 10 (again, I rounded up to be safe). 10 WOF strips at 3" each is 30 inches; I would buy one yard.

I hope that helps!
12-27-2010, 06:29 AM
#5
Senior Member

Join Date: Aug 2010
Posts: 601

Oh yeah, I'm good at math, but I do make errors in simple arithmetic occassionally, so please check my math!
12-27-2010, 06:32 AM
#6
Senior Member

Join Date: Aug 2010
Posts: 601

Sorry, forgot the borders. It sounds like 2 WOF strips will be long enough for each side of the quilt for a border. That means 8 WOF strips total. If you use your widest width (5" ), that would mean 8 * 5" = 40" total. I would buy 1 1/2 yards, again to be safe.
12-27-2010, 06:45 AM
#7
Super Member

Join Date: Mar 2008
Location: Pacific NW
Posts: 4,190

Mattee ~ That's great of you to do all those calculations!
12-27-2010, 06:51 AM
#8
Senior Member

Join Date: Aug 2010
Posts: 601

Thanks, but I don't mind. I love math! I wish more people loved it like I do; that's why I included how I did the calculations, so if anyone is interested, they can adapt it for their blocks. I am always doing calculations in my head while I'm at a quilt shop to buy fabric, since I usually think of a block or pattern I want to use while I'm driving!

Originally Posted by DJ
Mattee ~ That's great of you to do all those calculations!
12-27-2010, 10:14 AM
#9
Senior Member

Join Date: Jul 2010
Location: california
Posts: 932

great job mattee. i resolved this enigma by purchasing the quilt calculator. ha-ha
12-27-2010, 10:41 AM
#10
Super Member

Join Date: Nov 2010
Location: Cincinnati, OH
Posts: 3,734

I bought the calculator but haven't used it yet. Need to use it to calculate how much material for my sister's quilt. Shouldn't be too hard since it's a log cabin pattern and only using 3 different materials. I'll have to try and use the above formula too and see how I do.
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