Home › Fence Post Spacing
Fence Post Spacing
Quick answer: Wood privacy fences usually space posts 6 to 8 ft apart on centre, matching rail and panel lengths, while chain-link line posts are often about 10 ft apart and farm wire fences wider. Closer spacing makes a stiffer fence that resists wind and sag. Always check panel or kit instructions and local requirements.
What "on centre" means
Post spacing is measured on centre (o.c.): from the centre of one post to the centre of the next. With 8 ft rails, centre spacing of 8 ft lets each rail end land half on one post. If you measure the gap between posts instead, rails will not reach. Vinyl and pre-built panel systems often have exact spacings set by the manufacturer, sometimes slightly different from a round number, so read the instructions before digging a single hole.
Common spacings by fence type
| Fence type | Typical spacing | Why |
|---|---|---|
| Wood privacy, stick-built | 6–8 ft o.c. | Matches common 8 ft rail stock; 6 ft for tall or windy |
| Wood picket | 6–8 ft | Light load |
| Pre-built wood panels | Panel width + post | Fixed by panel |
| Vinyl systems | Set by manufacturer | Rails slot into posts |
| Chain link | About 10 ft line posts | Fabric and top rail design |
| Ornamental metal | Panel width | Fixed sections |
| Farm woven or barbed wire | Often 8–16 ft or wider | Long runs; braces at ends and corners |
These are typical starting points, not requirements. Wind exposure, fence height and the material's span strength all change the right answer.
Wind, height and spacing
Taller solid fences catch more wind. Closer spacing shares load across more posts and shortens rail spans so they flex less. In exposed sites, coastal areas or open fields, many builders tighten spacing or upsize posts. Open designs like spaced pickets and chain link catch less wind.
Planning spacing on a real line
Real fence lines rarely divide evenly. If your run is 70 ft and you want 8 ft spacing, 70 ÷ 8 = 8.75 sections. You can build eight 8 ft sections plus one 6 ft section, or adjust to nine sections of about 7.8 ft. Equal spacing looks better and makes cutting rails simpler. Start at corners and gate openings, which are fixed, then divide each straight run between them.
Gates break the pattern
Gate openings are set by the gate width plus hardware clearance. Lay out gate posts first, then space line posts between them. A 4 ft walk gate or a 10–12 ft double drive gate changes where the posts fall.
Worked example
Figures below are illustrative examples (2026-10-29), not quotes or guarantees.
Assumptions: a 96 ft side run with a 4 ft walk gate at one end and an 8 ft target spacing. The two gate posts are fixed first. The remaining 92 ft divides into 11 sections of about 8.4 ft (too long for 8 ft rails) or 12 sections of about 7.7 ft. Choose 12: that span needs 13 posts, one of which is the inner gate post, plus the outer gate post, for 14 posts in total. The fence calculator counts the rest once spacing is settled.
Spacing and material counts
Tighter spacing means more posts, holes and concrete but shorter rails. Going from 8 ft to 6 ft on 150 ft adds about 6 posts and, at two bags per post, about 12 more bags of concrete. Use the fence post calculator and fence concrete calculator to compare.
Slopes and spacing
On slopes, measure spacing horizontally (level), not along the ground. A string line pulled level with a line level, or a laser, keeps sections consistent. Stepped sections may need slightly tighter spacing on steep grades so steps stay manageable.
Spacing for farm fences
Farm fences cover long distances, so posts are often wider apart, with heavy braced assemblies at ends, corners and gates that carry the wire tension. Line post spacing depends on livestock, wire type and terrain. See the farm fence guide and acreage fence calculator.
Spacing and rail stock
Rails are commonly sold in 8 ft, 10 ft, 12 ft and 16 ft lengths depending on region. If you choose spacing that matches the rail, you avoid joins mid-span. Longer rails spanning two sections (for example a 16 ft rail across three posts) can stiffen a fence because joints are staggered. Plan rail joints so they land on posts, and stagger them between top, middle and bottom rails when you can.
Horizontal fences need closer spacing
Horizontal board fences are popular, but boards spanning between posts sag and cup more than vertical pickets fastened to rails. Many builders use 4 to 6 ft spacing or add a centre stud between posts to support horizontal boards, and use thicker boards. Check the board maker's span guidance before choosing a spacing.
Checking your layout before digging
Before you dig, walk the line with stakes at every planned post. Look for trees, roots, buried rocks, downspouts, sprinkler heads and slopes that might force a post to move. Moving a stake is free; moving a post set in concrete is not. Confirm the line is on your side of the property boundary and that utility locates are marked.
Common mistakes
- Measuring spacing post-face to post-face instead of centre to centre
- Starting from one end and ending with a tiny leftover section
- Ignoring gate openings until the end
- Spacing along the slope instead of level
Spacing for gates and corners first, always
Every layout decision flows from fixed points, so mark them before anything else.
FAQ
Can I space wood posts 10 ft apart?
Rails would need to be longer and would sag more; most builders keep wood privacy fences at 8 ft or less.
Does spacing change for 8 ft tall fences?
Taller fences often benefit from closer spacing or stronger posts; check bylaws, which may not allow 8 ft.
How do I mark spacing?
Use stakes, string and a long tape; see how to measure a fence line.
What depth?
See how deep fence posts.
Try the calculator · Back to FAQ & guides