Wood Fence Calculator
Estimate boards, posts, rails, and cost for your wood fence
Total length of the fence run
Height of the fence panels
Board layout type
Posts
—
posts
Rails
—
rails
Boards Needed
—
boards
Estimated Cost
—
USD
Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
How to Use This Calculator
Building a wood fence? Accurate material takeoffs keep your budget on track and prevent mid-project supply runs. Our calculator handles posts, rails, and boards for the three most common wood fence styles.
- Measure the total length of your fence run in feet
- Enter the planned fence height
- Choose your style: Privacy, Picket, or Split Rail
- Add 10-15% extra for waste, cuts, and rejects
Expert Insights
Smart analysis for your Fencing project
Style-Based Rail Count
Privacy fences need 3 rails per section for board support, while picket and split rail styles use 2. Our AI selects the correct rail count based on your chosen style.
Board Spacing Logic
Privacy boards are butted tight while pickets use a 5.5" on-center gap. Split rail uses no boards at all — the calculator zeroes them out automatically.
Cost Benchmarking
Wood fences average $15-25 per linear foot installed. Our estimate uses $18/ft as a realistic US midpoint for pressure-treated lumber and basic hardware.
Calculation Formula
Posts = ceil(fenceLength / 8) + 1
Rails = Posts × railsPerSection (Privacy: 3, Picket: 2, Split Rail: 2)
Boards = ceil(fenceLength × 12 / boardGap) (boardGap = 5.5" for Privacy/Picket; 0 for Split Rail)
Estimated Cost = ceil(fenceLength × 18)
Wood Fence Material Comparison
| Material Type | Lifespan | Cost per Linear Ft | Rails/Section | Maintenance |
|---|---|---|---|---|
| Pressure-Treated Pine | 15-20 years | $15-25 | 2-3 | Stain every 2-3 yrs |
| Cedar | 20-25 years | $20-35 | 2-3 | Stain every 3-4 yrs |
| Redwood | 25-30 years | $30-50 | 2-3 | Stain every 3-5 yrs |
| Composite | 25-30+ years | $25-45 | 2-3 | Low maintenance |
Authority References
Our calculations are based on guidelines and standards from these authoritative sources:
- American Fence Association (AFA) — Fence Installation Standards & Best Practices. Learn more
- International Residential Code (IRC) — Chapter 4 — Foundations for fence posts. Learn more
- American Wood Protection Association (AWPA) — Wood Preservative Treatment Standards. Learn more
Frequently Asked Questions
How far apart should fence posts be?
Wood fence posts are typically spaced 8 feet apart on center. This calculator uses an 8-foot spacing and adds one extra post to close the run.
How many rails do I need for a wood fence?
Privacy fences usually need 3 rails per section, while picket and split rail fences use 2 rails per section. Rails run horizontally between posts.
What size gap should I leave between fence boards?
For privacy fences, boards are butted tight. For picket fences, a 5.5-inch on-center spacing is common. This calculator uses a 5.5-inch board gap for both privacy and picket styles.