I want to make a queen sized quilt for my sister for Christmas in the rail fence pattern. I know I cut 2 1/2" strips from each of the 3 colors, sew them together, then cut in 6 1/2" squares. How many yards of each color do I need to make queen sized?

Thanks for your help! :)

They don't have to be 2.5".

If you want to make them wider, you can.
For instance, using three 3.5" wide strips, you't get UNFINSHED squares that were 9.5".

Different look over such a large quilt.
Both quilts are approx 80"x100".

For the 6" blocks - you'd three yards of each color.

For the 9" blocks - you'd need 3.25" yards of each color.

Not including borders, binding, etc.

Oh, I like the one with the 3.5" inch strips, I didn't realize how much different it would look!

Thanks MTS!

Well it's such a big area - the top of the bed is 60"x80".

You might want to make some scrap blocks and just toss them on the bed to see how it looks proportionally.

Those fabric requirements I gave you were straight out of EQ.

I'm checking the math backwards and I see you'll be fine with those amounts - again, not including the border, binding or backing.

9.5" UNFINISHED blocks:
Total blocks needed = 9x11 = 99
Four 9.5" cuts per strip (38" )
99 / 4 = 25 strips
25 x 3.5" wide cut strips = 87.5" length of fabric
87.5" / 36" = 2.5 yards

So I don't know where EQ is getting 3.25 yards but go with it - you can always use it on the block.