Upsize 12" Block
#13
Super Member
Join Date: Sep 2011
Posts: 2,720
So just to brush off my brain cells....
26/12 = 2.1667 so all your measurements would have to be multiplied by 2.1667 to give you a 26" block. Much easier to multiply by 2 and add that 1" sashing, right?
Or am I wrong about multiplying each measurement by 2.1667?
If you had a 26" block and wanted to shrink it down to 12" you would divide 12 by 26 to get your multiplier for the sides..... I think.
26/12 = 2.1667 so all your measurements would have to be multiplied by 2.1667 to give you a 26" block. Much easier to multiply by 2 and add that 1" sashing, right?
Or am I wrong about multiplying each measurement by 2.1667?
If you had a 26" block and wanted to shrink it down to 12" you would divide 12 by 26 to get your multiplier for the sides..... I think.
#16
be sure to consider seam allowances. A double size block still has only one seam!! A 2.5 inch block will be 4.5 since finished is 2 inches, double to 4, then add seams. And border would indeed be 1 1/2 inch strips to finish at 1 inch on all sides.
#17
Super Member
Join Date: Sep 2011
Posts: 2,720
DebLuvs and CJ -- it is not a straightforwards multiplication of the 2.5 block measurements. Yikes! Thank you! My method would take a 2.5 in measurement andupsize it to a 5.something square so ultimately it would be much bigger than 26 inches. Time to do some more brain dusting! What a great brain teaser! Double the size of the finished block then add seam allowances. Good thing I have never tried to change the size of a pattern.
#18
Senior Member
Join Date: May 2022
Location: Northeast
Posts: 682
The .5 is the seam allowance (.25 around each edge of the block) if you are just doubling the pattern, you would only double the first number. A 2.5 block doubled becomes a 4.5 block. A 4.5 block doubled, becomes an 8.5 block, doubling the 8.5 block becomes a 16.5 block and so on.
Note: I'm just showing the math to double a block.
Note: I'm just showing the math to double a block.
Last edited by quiltsfor; 02-24-2023 at 03:23 AM.