As asked by others .... why are you so wanting a 12" instead of a 10" block?
Also, as suggested by others ... if it's because you want a larger quilt, you don't have to change the block size to accomplish that.

Perhaps there is something that we are missing on this?

Couldn't you just redraw the block onto a 12x12" square? Divide it up by the number of pieces in the same ratio they are in the 10" block. That's the only way I would be able to figure it out.

I was thinking of making a sampler quilt and really liked both of these blocks when I saw them in the magazines, they are both 10" blocks and I have to go by a pattern I can't make my own so I thought there might be an easy way to enlarge the blocks, boy was I wrong. I just wanted to make all my block 12" now I'm thinking I 'll just leave these 2 out or just find more 10" blocks to make the quilt.

since you are adding them into a sampler quilt with other 12 inch blocks I would just add a border around each - that's the easiest way. The Diamond Candy quilt really needs both blocks (the one with the star in the middle AND the multi-block one) in order for the pattern to show up. If you use only one of them in a sampler they lose their secondary design. Just say'in.

WHEW, i'm glad i'm not a smart quilter....
cuz i'm really confused now......

How do you turn the % into inches?


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great link, I always try printing and printing again untill I have the right size.....I think I will save a lot of paper and ink now

;-)

Remember that when u add a piece of fabric, you have to count two 1/4 inch measures, to account for the quarter inch from both pieces that are taken up in your 1/4 inch seam.
Then u can add the amount u want the block to be, (i.e.1/2 of the total enlargement if u are using a block with two parallel sides. If u add 1 1/2 inch to two sides of a block, the measurement of that block will be 2 inches wider. (The 1/2 inch is used to make the seam--it makes the original block 1/4 inch smaller because u used it in a seam, and 1/4 of the added piece is also used in the seam.) Hope this helps.

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To turn a 10" block into a 12" block the chart shows to enlarge the pattern 120%. 10 x 1.20 = 12 so you would have to enlarge each template or measurement for each piece in a 10" block by 120% before seam allowances.

The Diamond Candy quilt mentioned relies on 4 basic 10" blocks to create a 20" block and it has sashing on the horizontal rows or so it appeared to me.

Hubby decided to go with me to Joann's which had me all confused so I didn't get a chance to look at the Double Pinwheel block you also mentioned. Here are some links to different blocks all called double pinwheel which is easily converted to almost any size since it is a 4 patch type block:
http://quilting.about.com/od/blockof...e_pinwheel.htm

http://tlc.howstuffworks.com/home/do...uilt-block.htm

The next one is the same as the last one only it "spins" the opposite direction: http://www.quilt-lovers-guide.com/do...ilt-block.html

http://www.mccallsquilting.com/qb/mc...101/index.html

My version of BlockBase has 3 more versions of the block--pictures attached below.

Oh, and you mentioned you were making a sampler which is how I taught myself to quilt. Quilter's Cache is probably one of the best sites on the web to find blocks by size. Here is the link to all the 12" blocks. http://www.quilterscache.com/BlocksbySizeC.html


If you really like the 10" versions though and don't want to do the math to enlarge them--by all means feel free to add a one inch border to the pattern you have. It's a sampler so it won't matter. They're all supposed to be different.