How Far Apart Should Fence Posts Be

For a wood fence, 8 feet of post spacing is the most common default, with 6 feet used for taller or heavier panels and up to 10 feet for lighter materials like chain link. Spacing is a real design decision, not a fixed rule, because it trades post count (and cost) against how much unsupported span your rails and panels can carry.

Common spacing by material

Wood privacy or picket: 6 to 8 feet is typical. Tighter spacing suits taller fences or higher wind exposure.
Vinyl panel: matches the panel width, usually 6 or 8 feet, since vinyl sections are pre-manufactured to a fixed size.
Chain link: commonly 10 feet, since the fabric itself carries little of its own weight between posts.
Split rail / ranch: often 8 to 10 feet, since horizontal rails between posts are the load-bearing element rather than infill panels.

How spacing changes post count

Post count is not a simple ratio of length to spacing, because of the “plus one” post at the end of every run:

sections = ceil(run / spacing)
posts along the run = sections + 1

A 100 foot run at 8 foot spacing needs 13 sections (100 / 8 = 12.5, rounded up), so 14 posts along the run. The same 100 feet at 10 foot spacing needs only 11 posts, a meaningful difference in both material and labor once you are pricing a full fence.

Wider spacing is not free

Going from 8 feet to 10 feet spacing reduces post count, but it also increases the unsupported span each rail or panel section has to carry. That is fine for materials designed around wider spacing, like chain link fabric, but pushing a wood privacy fence’s rails to 10 foot spans without checking the rail size can lead to sagging over time.

Work out your exact post count

The fence post calculator computes total posts, broken into line, corner, end and gate posts, for any spacing you enter, so you can compare spacing options before committing to one. The wood fence calculator and chain link fence calculator both default to a sensible spacing for that material and let you adjust it.