Space fence posts 6 to 8 feet on center. Six feet is the sturdier choice for tall, heavy, or wind-exposed runs; eight feet uses fewer posts and less concrete on lighter fences. "On center" means measured from the center of one post to the center of the next.

Before you stake anything out, drop your total run length into the fence calculator — it converts your spacing choice into a post count and flags the leftover footage at the end of a run.

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Six Feet vs. Eight Feet

The tradeoff is strength versus cost. Closer posts mean a stiffer fence and shorter, less floppy rails. Wider posts mean fewer holes to dig and fewer bags of concrete to buy.

Choose 6 feet on center when:

  • The fence is 6 feet tall or taller
  • The site is windy or exposed
  • You're building solid privacy panels that act like a sail
  • You want the most rigid result and don't mind extra posts

Choose 8 feet on center when:

  • The fence is on the shorter side (4 feet or under)
  • It's an open style — picket, ranch rail, or spaced boards — that lets wind through
  • You're covering a long run and want to minimize cost and labor

If you're unsure, split the difference at 7 feet, or default to 6 for anything tall. A fence built too loose is hard to stiffen later; one built tight is forgiving.

The Posts-Equals-Sections-Plus-One Rule

Here's the part people get wrong when ordering materials. The number of posts is always one more than the number of sections, because both ends of the run need a post.

  1. Measure the total run length in feet.
  2. Divide by your spacing (6 or 8) to get the number of sections. Round up.
  3. Add 1 for the final post.

So a 48-foot run at 8 feet on center is 6 sections — but 7 posts. The same run at 6 feet on center is 8 sections and 9 posts. Forget the "plus one" and you'll be one post short on every straight run, and short again at every corner.

Corners and ends each need their own post. A simple square enclosure has four corner posts before you've counted a single line post.

Mind the Leftover

Runs rarely divide into perfect 6- or 8-foot increments. When the last section comes up short, you have two good options:

  • Even out the spacing. Spread the gap evenly across all sections so they're all slightly under your target. A run of 22 feet becomes three even 7-foot, 4-inch sections rather than two 8-foot sections and a stubby 6-foot one.
  • Absorb it in one section. Keep every section at the target spacing and let the last one be short. Fine for utility fencing, less tidy for anything visible from the street.

Even spacing almost always looks better. The calculator handles this math for you, but it's worth understanding so the layout on the ground matches what you bought.

Laying It Out Accurately

A spacing plan is only as good as the string line you set it against.

  1. Set the corner and end posts first. These anchor everything.
  2. Run a taut string between them at the post-top height.
  3. Mark line-post centers along the string at your chosen spacing.
  4. Check for square at corners using the 3-4-5 method: measure 3 feet along one line, 4 feet along the other, and adjust until the diagonal reads exactly 5 feet.
  5. Dig, set, and plumb each post against the string.

For digging, a clamshell post hole digger handles average soil; rent an auger if you're setting more than about ten posts. Keep a torpedo level in your back pocket to plumb each post on two faces before the concrete sets.

Quick Recap

  • Space posts 6 to 8 feet on center — six for strength, eight for economy.
  • Posts always equal sections + 1; both ends need a post.
  • Corners and ends each get their own post.
  • Spread leftover footage evenly for the cleanest look.
  • Set corners first, run a string line, and check corners for square.

Spacing sets the skeleton; depth keeps it standing. Pair this with our guide on how deep fence posts should be, then confirm your post count and concrete in the fence calculator.