Does anyone know how much fabric you need for make lap/twin/full/queen/king size disappearing nine patch.I don't want to cut my fabric and then run out.Will use a 5in square.Thanks

There are probably a ton of calculators on the forum 0 I would run a search because it depends on how large you want the blocks.

http://www.vrya.net/quilt/index.php This is the one I use.

I'm working on a queen size one. If I recall correctly, I bought 5 yards of print, 4 yards of solid, 3/4 yard print for binding, and I used 7" squares. The D9P is only on the top of the mattress; the sides are just 10.5"x7" blocks of the prints. I had juuuuust enough, but I'd probably purchase another yard of solid if I was going to do it again (I got a little nervous when I cut my borders).

I just finished one not to long ago.I'm not sure exactly i think i used 3 1/2 yds for outside corners,the same for the other 4 squares and i don't remember the one square in the middle.I cut the blocks 5 inches each.I think the blocks came out 11 1/2 or 12 inches.I made a full size.I have a picture of the quilt if you want to see it.Connie in CO

In part it depends on the size of the square you are using to make the 9-patch.

The Disappearing 9 patch I just finished, shown in avatar, used 5 colors and 2 yards each it is 90" square

Fabric Requirements
You can use any number of like sized squares as long as the number of squares you use is divisible by nine.

Each group of nine squares will yield four disappearing blocks. For example if you begin with 36 squares to make four nine patch blocks, then these will yield a total of sixteen disappearing blocks.

To calculate the size of the finished block you need to multiply the size of your original squares by three, divide by two, then take off one. This will be the finished size of the block.
For example if you begin with 5-inch squares the calculation would be as follows.
5 x 3 = 15, ÷ 2 = 7½ - 1 = 6½ inches.
6-inch squares would yield 8-inch blocks, 7-inch squares would yield 9½- inch block
Hope this helps you figure what you need.
OzarksGma