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To fold paper for a tri-fold brochure, first orient your paper landscape-style with the front of the brochure facing down on the left. Then, use a ruler to divide the paper into thirds, and use a pencil to mark each third at the top of the paper. Bring the right edge of the paper over to the first mark on the left and fold along the crease. Now bring the left edge of the paper over to the right edge and fold along the crease. Finally, erase the pencil marks along the top of the paper.
Video: How to Fold Paper for Tri Fold Brochures - wikiHow