How far apart should fence posts be?
8 feet on center is the industry-standard maximum spacing for most wood fence styles, including privacy, picket, and shadowbox fencing, according to fencing industry installation guides. Shorter spacing, around 6 to 7 feet, is sometimes used for extra rigidity in high wind areas or with lighter rails.
That 8 foot figure is also this site's own fence calculator default input, which is a convenient match rather than a coincidence: both point to the same widely used spacing.
Where the 8 foot figure comes from
This is a sourced industry convention, not a figure this site invented. Fencing contractor guides document 8 feet on center as the standard maximum spacing for most wood fence styles, including privacy, picket, shadowbox, and split rail. Two practical reasons drive that number: standard dimensional lumber rails are commonly sold in 8 foot lengths, so 8 foot spacing uses a full rail with no cutting and no waste, and wood rails spanning much further than 8 feet between posts begin to sag under their own weight and the fence panel's load over time.
Sources: NMI Fence, "Fence Post Spacing Guide" and FenceScape, "A Practical Guide to Fence Post Spacing".
Spacing by fence style
| Fence style | Common post spacing | Notes |
|---|---|---|
| Wood privacy / picket / shadowbox | Up to 8 ft on center | 8 ft is the documented industry maximum; many installers use it as the default. |
| Split rail | Up to 8 ft on center | Mortise-and-tenon rail joints at each post; same 8 ft industry maximum. |
| Chain link | 8 to 10 ft on center | Mesh and top rail tolerate slightly wider spacing than a solid wood panel. |
These are general industry conventions. Local wind exposure, fence height, rail material, and your local building code can all push the right spacing for your project narrower than the maximum.
What spacing does to your post count
Post spacing is the main input that drives how many posts and panels a fence run needs. Using this site's fence calculator formula, spaces = run length divided by spacing, rounded up, and posts = spaces plus 1, for a 100 foot run:
| Spacing | Spaces (100 ÷ spacing, rounded up) | Posts |
|---|---|---|
| 6 ft | 100 ÷ 6 = 16.67, rounded up to 17 | 18 |
| 8 ft (industry maximum) | 100 ÷ 8 = 12.5, rounded up to 13 | 14 |
| 10 ft | 100 ÷ 10 = 10 | 11 |
Tighter spacing always means more posts and more material for the same run length, which is the tradeoff against going narrower than the 8 foot maximum for extra rigidity. For the full post-and-panel breakdown at the 8 foot default, see how many fence panels for 100 feet.
Frequently asked questions
How far apart should fence posts be?
8 feet on center is the industry-standard maximum spacing for most wood fence styles, including privacy, picket, and shadowbox fencing, according to fencing industry installation guides. Shorter spacing of 6 to 7 feet is sometimes used for extra rigidity in high wind areas or with thinner rails.
Why is 8 feet the common maximum for wood fence posts?
Two practical reasons. First, standard dimensional lumber rails are commonly sold in 8 foot lengths, so 8 foot spacing uses full rails with no cutting and no waste. Second, wood rails spanning much further than 8 feet between posts start to sag under their own weight and the load of the fence panel over time.
What happens if I space fence posts wider than 8 feet?
The rails have to span further unsupported, which increases sag and bowing over time, especially with standard dimensional lumber rails rather than thicker or reinforced ones. Wider spacing also means fewer, more heavily loaded posts, each one resisting more wind load per post.
Does chain link fence use the same 8 foot spacing?
Chain link and wood fencing are commonly installed with similar spacing ranges, generally 8 to 10 feet on center, since chain link's load path (mesh and top rail, not solid wood panels) tolerates slightly wider spacing than a solid wood panel does. Check your specific fence system's manufacturer instructions.
How many posts does 8 foot spacing need for a 100 foot fence?
14 posts. 100 feet divided by 8 feet is 12.5, rounded up to 13 spaces, and a straight run always has one more post than it has spaces, so 13 plus 1 equals 14 posts.