Okay, so I'm sure this has been asked a million times, and I should continue looking/searching old posts, but I've searched calculating, 2" blocks and lap quilt math and looked at least 15-20 posts per search and found nothing.

So, can anyone tell me how to calculate the number of 2" squares I would need for a lap quilt? Let's say 40X60, just to put a number on it.

I used to be really good at algebra, but I haven't taken a math class in more than 10 years and it's definitely a use it or loose it subject.

Thanks in advance.

C

It's easy enough to me. If you want 2" finished, then divide 40" by 2. Seems to me you would need 20 across and 30 down. Then add 1/2" to each one for seams.

I'm figuring 600 sq's. That would be 20 across and 30 down.

It's entirely too early, and I am clearly not awake yet. As soon as I made my last post the answer came to me. At least I think it did. Tell me is my math on point?

width
2x - 1/2x = 42
1.5x = 40
x=28

length
2x -1/2x = 60
1.5x = 60
x=40

28x40=1120

So I'd need 1120 2 inch squares (1.5 inch finished) for a lap quilt that was 42x60?

Not to worry....it's easy and doesn't even involve algebra.....
40" divided by 2" = 20 squares
60" divided by 2" = 30 squares

20 squares across multiplied by 30 squares down = 600 squares

If you want your squares to be 2" finished, then you'll want to cut 2 1/2" squares. Unless you want them all to be totally random, you might want to consider strip piecing vs cutting all those little squares....just a thought! Good luck!

1080 if your cut size is 2" (finished size 1 1/2" ).
600 if your finished size is 2" (cut size 2 1/2" ).

let's see... if you're wanting the squares to be 2" Finished size...

40"/2" = 20 squares across (cut at 2.5 inches)
60"/2" = 30 squares down
20x30 = 600 squares, cut at 2.5 inches.

If you add a narrow border, your quilt should finish at a nice size.

I hope my math is correct... Perhaps I should be waiting until I've had more Coffee!!! lol...

I have a chart that indicates you will be able to get 357 2" squares from a yard, 99 from a fat quarter. Now I do not know if that is finished or not.
JulieM

You got it!

Thanks KR...

Now to figure out how many squares I already have and how many more I need, but that I'll have to tackle after work.

Thanks a bunch everyone.