QuantityBench Fence Post Spacing
Post spacing drives most of a fence's material list — posts, concrete, and rail length all follow from it. Here's how spacing typically varies by fence type, and what to add extra concrete for.
Typical spacing by fence type
| Fence type | Typical post spacing | Why |
|---|---|---|
| Wood privacy / picket | 6–8 ft | Matches standard 8 ft rail lumber without trimming |
| Chain link | up to 10 ft | Fabric tension carries load between line posts |
| Vinyl | per manufacturer, often ~8 ft | Panel systems are sized to a fixed spacing |
| Split-rail | 8–10 ft | Rails rest in post notches, not fastened — wider spacing is normal |
General references, not a code requirement — manufacturer specs (especially for vinyl and chain link systems) and local wind conditions should take precedence.
The spacing tradeoff
Wider spacing means fewer posts and less digging and concrete for a given fence length, but more rail sag over time and less resistance to wind load — each rail section has to span a longer, unsupported distance. Closer spacing costs more upfront in posts and concrete but holds a straighter line longer, which matters more for tall privacy fences or exposed, wind-heavy sites than for a short garden fence.
Gate and corner posts need more
A line post only holds itself up. A gate post also absorbs the leverage of a swinging gate every time it opens and closes, and a corner post carries the pull from two fence directions instead of one — both commonly get a larger post size, a larger-diameter hole, and more concrete than the 2-bag-per-hole default this site's Fence Calculator uses for a standard line post. Budget extra concrete bags for every gate and corner post rather than assuming the flat per-post average covers them.
Hole depth
Post hole depth is a local-code question, not a fixed national number — it's typically set by your area's frost depth (so the post doesn't heave with seasonal freeze-thaw) with a rough stability guideline of roughly a third of the post's above-ground height on top of that. Check with your local building department or an installer before digging, especially for a taller fence or heavier gate.
Estimate your fence materials
Enter your chosen spacing into the calculator below to get post, rail, picket, and concrete counts for your actual fence length.
Frequently asked questions
What is a typical post spacing for a wood privacy fence?
6 to 8 feet on center is the common range for a residential wood privacy or picket fence — close enough that standard rail lengths (8 ft dimensional lumber) don't need trimming or splicing, but wide enough to keep post and concrete costs reasonable.
Does closer post spacing make a stronger fence?
Generally yes for wind and rail sag resistance, but it also means more posts, more digging, and more concrete for the same fence length — there's a real cost tradeoff. Very tall fences, or fences in high-wind areas, are often spaced closer (6 ft or less) specifically for that added rigidity.
How much concrete does a corner or gate post need compared to a line post?
More. This calculator's default of two 50 lb bags per hole is a rule of thumb for a standard line post; corner posts and gate posts carry more structural load (a gate also racks the post sideways every time it swings) and commonly get a larger-diameter hole and more concrete. Check your gate hardware manufacturer's spec if you have one.
How deep should fence post holes be?
Deep enough to sit below your local frost line where one applies, and commonly at least a third of the post's above-ground height as a rough stability guideline — but frost depth varies enormously by region and is set by local building code, not a single national number. Check with your local building department or an installer before digging.