How to Figure Number of Blocks on Point
 

Hi - I'm trying to make a memory quilt. I have looked everywhere but cannot find the information I need. I want to make a queen size quilt ( 89 x 100 or so). How many 9" finished whole blocks or 9 1/2" finished whole blocks would I need for this? I could always put sashing around the edges if needed. How do I figure this? I've found how to figure the half triangles and corner triangles.

Thanks so much for helping me out!

LaDonna

My calculation is that you need 98 blocks, 4 corner triangles, and 26 setting triangles. Diagonal rows have blocks as follows:
Rows 1 and 14: 1 block, 1 corner triangle, 2 setting triangles
Rows 2 and 13: 3 blocks 2 setting triangles;
Rows 3 and 12: 5 blocks, 2 setting triangles;
Rows 4 and 11: 7 blocks, 2 setting triangles;
Rows 5 and 10: 9 blocks, 2 setting triangles;
Rows 6 and 9: 11 blocks, 2 setting triangles
Rows 7 and 8: 13 blocks, a setting triangle and a corner triangle

Kris -
Wow!!! Thank you so much! How did you figure that, and will I be doing 9" or 9 1/2" blocks, and what is the final measurement?
Thanks so much!
LaDonna

Plays10s ... This link will help you figure this out, and for other times too!

Free Online Graph Paper / Asymmetric and Specialty Grid Paper PDFs (incompetech.com)
Choose Axonometric, then select your desired options.
Or you can use any graph paper (also in link), then turn on point.
You'll then be able to see on paper what KrisB has explained.
Plus, can check out other options you may want to consider.

There's calculators and charts online for the diagonal distance across a block.
However, for me, I find it just as easy, (perhaps simpler?)
to go old school and just measure with a ruler! :)

Thank you! I really appreciate this! LaDonna

You're Welcome!
I use the different grids in multiple ways when planning quilts. Good Luck!

I also use graph paper to plan out settings and design most of my quilts. Other people I know carry around sketch books, I carry a pad of graph paper. 😉

Sorry. I don’t get that amount. The diagonal of a 9” square is 12.72. There would be 7 across for width (7x 12.72= 89.04”) and 8 for the length (8x 12.72 = 101.76”). 7x 8=56 blocks you would need to make. I use mathopenref.com “diagonals of a square”. If you scroll down, there is a calculator which is a great link.

My calculation does not include setting and corner triangles. Bonnie Hunter’s quilt I’ll blog has a great calculation for those.

Your calculation is correct as far as it goes, but misses the blocks in the alternating rows. For example, if you wanted to make a quilt with 2x 2 blocks set on the diagonal, you would need 4 (2x2) plus 1, for a total of 5.

Here, the OP needs 7 x 8 9” blocks (56), plus 6 (which is 7 minus 1) multiplied by 7 (which is 8 minus 1). The plus for the alternating rows is 42 more blocks, for a total of 98. That is the amount Krisb calculated.