How Many Fence Panels and Posts Do You Need?
Count panels, posts and concrete bags for a straight fence run, and learn what changes the count at corners, gates and slopes.
A straight run of panel fence is one of the easiest things to estimate, as long as you remember one rule: there is always one more post than there are panels.
Step 1: Measure the run
Measure the total length of the fence line in feet, including any gate openings, and write down the height you want.
Step 2: Count panels
Divide the length by the panel width and round up. Panels sold as 8 feet are sometimes slightly narrower, so check the real width with your supplier.
Step 3: Count posts
Posts = panels + 1. Every section needs a post at each end, and neighboring panels share a post.
Worked example: 100 feet of 6 foot fence with 8 foot panels
- Panels: 100 ÷ 8 = 12.5, rounded up to 13
- Posts: 13 + 1 = 14
- Post length: 6 feet of fence plus about 2 feet in the ground = 8 feet
- Concrete: 2 bags per post is 28 bags (a common planning figure; your hole size may change it)
What changes the count
- Corners and gates need extra posts and hardware.
- A gate replaces a panel and needs a stronger post at the hinge side.
- Sloping ground may need stepped or racked panels, which changes the spacing.
- Different panel widths change the number of sections.
Before you build
- Call 811 (in the United States) so underground utilities can be marked before digging.
- Check your property line and any survey before you place posts.
- Many places limit fence height or require a permit, and homeowners' associations may have their own rules.
- Post depth is commonly about one third of the post's length, and deeper where the ground freezes; check local requirements.