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Jelly Roll strips are 40 to 42" each.

Each jelly roll is 2.5" x 40 - 42" depending of what you purchased.

Below is figuring a jelly roll strip of 40"

If you want to make a block 14.5" square then: do you want the 14.5 to be the unfinished size?

If you do, then for the block you will need to cut seven 14.5" long strips from the Jelly rolls fabric -- if you take a jelly roll strip that starts out at 40" then you will get Two 14.5 strips from each jelly roll with 11" left over from the jelly roll strip.

You want a total of 9 blocks - so you would need 7x9 = 126 strips of 14.5. Then 126 divided by 2 strips per jelly roll strip -- you would need as Gay stated above 63 full jelly roll strips. Less if you sew some of the 11" left over together and cut them down to 14.5"

Note that blocks will have more than one of the same strips in them as you are only making 9 blocks. Unless you have multiple jelly roll strips to be able to pick and choose.

This is all with an unfinished block of 14.5" which will basically be a 14" block when finished.

If you want the 14.5 Block to be your finished block then you will need to cut your strips to 15" - you would still only need 63 jelly roll strips with 10" left over from each strip, but the 15" will figure in the finished seam allowances when you sew your blocks together and add binding/border etc. to give you a 14.5 finished block size.