Fence Calculator
Plan a fence line: how many posts, sections, and rails you need for a given length.
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How it works
Divide the total length by the post spacing (commonly 8 ft) and round up for the number of sections. Posts equal sections plus one for the end. Rails are sections times the number of rails per span.
Formula
Sections = ⌈Length ÷ spacing⌉ · Posts = sections + 1 · Rails = sections × rails/section
Frequently asked questions
How far apart should fence posts be?
Most wood fences use 8 ft spacing; vinyl often uses 6 ft. Closer spacing is stronger and stiffer.
How many posts for a 100 ft fence?
At 8 ft spacing, about 13 sections and 14 posts, before adding extras for corners and gates.
How deep should fence posts go?
Bury about one-third of the post length, and below the frost line in cold climates, then set in gravel or concrete.