• You and I are in the same pickle, and unfortunately, as far as the internet goes, this seems to be an almost dead art/rule. I did, however, find this particular site that shows a diagram on how to fold any size of rectangle paper for any envelope. It involves measuring the envelope against the paper and following the picture. I hope you are better at diagrams than I am. Good luck!
  • Fold the bottom up just like with 8.5 x 11 paper, but bring it up about three inches higher, then trifold just like with letter size.

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