How many charm packs would you need to make a queen size quilt?

They are around 5 inches finished? 361 divided by 40
9 packages,
19 across
19 down, would roughly make a 95 X 95 quilt, a bit large for a queen... not much when you consider the quilting and then washing will bring it a bit smaller.

think my math is right.

best wishes!!!
Enjoy

awesome...thank you very much...