How many posts for 200 feet of fence?

At 8 ft spacing, ceil(200 ÷ 8) + 1 = 26 line posts for a straight run — then add one for each gate, end and corner. Two corners and a gate bring it to about 29.

Should gate and corner posts be bigger?

Usually yes. Gate and corner posts carry more load and are commonly stepped up (for example a 6×6 where the line uses 4×4) and set deeper. Count them separately from the line posts.

Is 6 ft or 8 ft spacing better?

8 ft uses fewer posts and matches 8 ft rails and panels; 6 ft gives a stronger, stiffer fence and is better for tall privacy fences and windy sites. Both are labeled typicals — tighten the spacing when in doubt.

Do corner posts count as line posts?

No — a corner is where the line changes direction, so it is an extra post added on top of the ceil(line ÷ spacing) + 1 straight-run count. The fence post calculator adds gate, end and corner posts for you.

How many fence posts do I need?

For a straight run the count is simply ceil(line ÷ spacing) + 1 — but the posts most people forget are the ones at the gates, ends and corners.

By Francesco Zinghinì

Posts carry the whole fence, so getting the count right is the difference between a smooth build and a mid-project trip back to the yard. The math is short; the judgment is in the spacing and the extras.

The core formula

Posts are set on center at a fixed spacing. Divide the line by the spacing, round up to get the number of sections, and add one closing post:

sections = ceil(line ÷ spacing)
line posts = sections + 1

Then add one post for every gate opening, every free end that isn’t already a corner, and every corner where the fence changes direction. Gate and corner posts also tend to be heavier (a 6×6 where the line uses 4×4) because they take more load. The fence post calculator lets you enter those extras directly.

What spacing should I use?

The common range is 6 to 8 ft on center, a labeled planning typical:

8 ft is the usual maximum for wood and matches 8 ft pre-cut rails and panels.
6 ft gives a stiffer, stronger fence — preferred for tall privacy fences, windy sites and heavy pickets.
Chain-link line posts often go up to 10 ft apart; farm posts are commonly spaced about 1 rod (16.5 ft).

Closer spacing means more posts but a fence that resists wind and sagging far better. If in doubt on a tall or exposed run, tighten the spacing.

Worked example

A 200 ft run at 8 ft spacing with two corners and one gate:

Sections: ceil(200 ÷ 8) = 25
Line posts: 25 + 1 = 26
Extras: + 2 corners + 1 extra gate post = 3
Total posts: 29

The same run at 6 ft spacing would be ceil(200 ÷ 6) = 34 sections → 35 line posts → 38 total — nine more posts for a noticeably stiffer fence. The post-spacing & count table lists these counts at 6, 7 and 8 ft for a range of lengths.

Line, terminal and gate posts

Not every post does the same job, and mixing them up throws off both the count and the budget:

Line posts are the in-between posts that just carry the fabric or panels. They are the lightest and most numerous.
Terminal posts (ends, corners and gate posts) anchor tension and turn the run. They are heavier, set deeper, and on chain-link they take tension bars and bands.
Gate posts are the most heavily loaded of all — every open-and-shut cycle levers on them — so they are the biggest section, set deepest, and often the ones that fail first if undersized.

Count terminals and gate posts separately so you order the right sizes rather than discovering you are short on the heavy ones.

Posts on a slope

On sloping ground the post spacing is still measured horizontally, so the count doesn’t change — but the posts get taller as you step or rack down a hill, and stepped rigid panels leave triangular gaps at the bottom you may want to close. Set posts plumb (vertical), not perpendicular to the slope, and plan the longest posts for the low end of each step.

Don’t forget the posts under the posts

Each post needs a hole, and most are set in concrete. Once you know the count, size the holes and the concrete with the concrete-per-post calculator and check the depth with the post-hole depth reference — a common planning rule buries about 1/3 of the above-ground height plus a 6" gravel base. Those are labeled typicals, not a structural design; frost depth, soil and wind load set the real depth, so check local code and a licensed engineer for load-bearing or high-wind posts.

How the post count drives everything else

The section count you compute here also feeds the rail count (rails = sections × rails per section) and, for panel fences, the panel count (posts = panels + 1). That is why the all-in-one fence calculator starts from line length and spacing: get those right and posts, sections, rails, pickets and concrete all follow.

Choosing the post material

The post count is the same whatever the post is made of, but the material changes cost, life and how the fence goes together. Pressure-treated wood posts are cheap and easy to attach boards to, but they sit in wet ground and are usually the first part to rot. Steel posts — galvanized pipe or a wood-post-in-a-steel-sleeve system — cost more but resist rot and hold plumb far longer, which is why many builders pair steel posts with wood pickets. Chain-link and ornamental fences come with their own steel or aluminum posts sized to the system. Whatever the material, the rule holds: gate and corner posts step up a size from the line, and the post is worth spending on, because replacing a failed post later is far more work than buying a better one now.

This is a material-quantity guide built on stable geometry and labeled spacing typicals, not a structural design. Confirm spacing and post size for your fence height, soil and wind exposure with a licensed, insured fencing contractor (and a licensed engineer for load-bearing or high-wind work), and call 811 before you dig.