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????

Give us the info. I'm sure we can help. What is the pattern?

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

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!

Oh yeah, I'm good at math, but I do make errors in simple arithmetic occassionally, so please check my math!

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.

Mattee ~ That's great of you to do all those calculations!

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!

great job mattee. i resolved this enigma by purchasing the quilt calculator. ha-ha

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.