Fence Calculator
Planning a fence? Enter the run length, post spacing and picket size to get a materials list: posts, rails, pickets and bags of concrete.
Fence Calculator
Why use the Fence Calculator
A fence is a lot of small parts. This turns the run length into an exact posts, rails, pickets and concrete list.
How to get your numbers
- Total fence length.
- Post spacing (8 ft is typical).
- Picket width and any gap between pickets.
Recommended for this job
How to use it
- Enter the total fence length.
- Set post spacing (8 ft is typical) and picket width.
- Add a picket gap for a spaced/picket look, or leave 0 for a privacy fence.
Frequently asked questions
How many fence posts do I need?
Divide the fence length by the post spacing and add one for the end post. At 8-ft spacing, 100 feet needs about 14 posts.
How far apart should fence posts be?
Six to eight feet on center is standard; closer spacing adds strength for tall fences or windy, exposed sites.
How much concrete do I need per fence post?
About two 60-lb bags per post for a typical residential fence — more for tall posts, gate posts, or sandy soil.
How many pickets do I need?
Divide the fence length (in inches) by the picket width plus any gap. Butted 3½-inch pickets need about 343 for a 100-ft run.
How many rails does a fence need?
Two rails per section for fences up to about 6 feet; use three rails for taller fences to prevent sagging and warping.
How deep should fence posts be set?
Bury about a third of the post’s above-ground height, and always below your local frost line to prevent heaving.
How do I estimate the cost of a fence?
Total the materials list — posts, rails, pickets and concrete — and price each locally, then add hardware and any gate. This calculator gives the quantities.
