To make garden beds out of old privacy fence, first you need to decide how wide you want your beds. We were planning on having all of our beds up against fencing, so we chose to make them 2 feet wide so we and the kids could reach the back side.
Measure all the fence planks and cut the cross braces at the same width. We recommend making the beds no more than 4 feet wide. We made these 2 feet wide because we planned to place them up against a fence and wanted to be able to reach to the back side.
You'll need two long sides and two short sides. Ours were 6 feet by 1 1/2 feet and 2 feet by 1 1/2 feet.