(I'm glad someone can do math!)

I am working on a quilt top right now, a Pineapple Block Quilt, and what I am doing is making more blocks. It went from 20 blocks to 30 blocks to 42 blocks. Right now I am on block 35. They are 10" blocks. I haven't decided yet if I want it larger or not. Once I lay it out at 42 blocks I will know. I would consider adding more blocks or a border or even 2 borders to make it larger. A lot of your decision is going to depend on what your pattern is.

As DebLuvs mentioned, if it's a traditional block, you can often find it in more than one size somewhere.

If that's the case, let us know the name and I'm sure someone here canhelp you out.

Watson

There are several ways to make a quilt larger.
You could make more blocks or bigger blocks. You could
also add sashing between the blocks and/or add a few borders.

Merryj,
I would make the blocks at least 10”. Is it a quilt with all the same block? Or multiple different blocks? What’s the name of your pattern? I change the size of blocks to suit me. Give me more info and I can walk you through it.

I make sure I have at least 4 or 5 yds. of fabric before I start a quilt or decide if I want to use two other colors with it. Then I am sure I have enough fabric. Nothing worse than not having enough. Sometimes impossible to match/find fabric you have had for a while.

you don't give specifics on how much bigger you want blocks and quilt--if you double the size of the 6" blocks (all pcs.) it would give you a 12" block--and double the quilt size. without having to add any blocks. If you made them into 9" blocks and added 1/3 the measurement of the pieces( for example a 1" sq. would be 1 1/3" ), it would increase the quilt size by 1/3 without adding blocks.

it is chained 9 patch quilt pattern by Pat Campbell. I would like to go from 6 inch to 8 or 10 inch blocks.

Looking at the pattern, I would be inclined to make more blocks. I think the final product would have a lot more drama. It is an interesting pattern. It reminds me of a garden trellis.

Someone with more experience, please check me, but I came up with:
9 inch block
3-1/2 inch squares
10 inch half square triangle
Stripped half square triangle approx.
3-3/16" paper piece template (3-3/4" cut strips)

12 inch block
4-1/2 inch squares
13 inch half square triangle
Stripped half square triangle approx.
4-3/16" paper pieced template (4 3/4" cut strips)