How the fence calculator works
Length divided by panel width gives panels; panels plus one gives posts. For pre-made panels the calculator rounds up to whole panels. For individual pickets it divides the total length by the picket width plus gap. Rails are counted per section (2 for a 6 ft fence, 3 for taller), and concrete is one 50 lb bag per post.
Set posts at least one third of their length in the ground and below the frost line in cold climates. Add a post at every corner and gate. Check local rules on fence height and boundary lines before you build.
Working out the paint for a wooden fence? The paint calculator covers it.