How to Calculate Fence Materials
The key measurement is linear feet — the total distance around the area you are fencing. Measure each side of your yard and add them together. For irregular shapes, break the perimeter into straight runs and sum them.
Posts formula
Posts = ceil(Length ÷ Post Spacing) + 1
Example: 200 ft at 8 ft spacing = 25 spans + 1 = 26 posts. Add 2 posts for each gate.
Example: 200 ft at 8 ft spacing = 25 spans + 1 = 26 posts. Add 2 posts for each gate.
Rails run horizontally between posts. A standard 6-foot privacy fence uses 3 rails per span — bottom, middle, and top. A 4-foot picket fence typically uses 2. Each span runs from one post to the next, so total rails equal spans times rails per span.
Post Spacing and Depth
- Wood fences — 8 ft is the most common spacing for standard dimensional lumber. This allows a 2×4 rail to span between posts without excessive sag. 6 ft spacing is stronger for tall privacy fences or windy sites.
- Vinyl fences — 8 ft is standard for most vinyl panel systems, which come pre-fabricated in 8-ft or 6-ft sections.
- Chain link — 10 ft post spacing is typical; the mesh fabric provides enough tension to span this distance without intermediate posts.
- Post depth — posts should be buried to one-third their total length, minimum 2 feet. A 6-foot fence using 8-ft posts: 2 ft in the ground, 6 ft above. Use the fence post depth calculator to get the exact depth for your frost line.
Fence Material Cost Reference (2026)
- Pressure-treated wood privacy fence — $15–$30 per linear foot installed
- Vinyl fence — $25–$45 per linear foot installed
- Chain link — $10–$20 per linear foot installed
- Aluminum / ornamental — $25–$40 per linear foot installed
- Materials only (DIY) run 40–60% of installed cost for most fence types.