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How the Privacy Fence Calculator Works
This calculator is built specifically for solid privacy fences — the most popular residential fence style. Unlike our general fence calculator, this tool lets you fine-tune board width, overlap, and fence height to get a precise material count and cost estimate.
The formula divides your total fence length (in inches) by the effective board width (actual width minus your chosen overlap). This gives you the exact number of boards needed. Posts are calculated based on your chosen spacing, with two extra posts added per gate opening.
Choosing the Right Board Width and Overlap
5.5-inch boards (1x6) are the industry standard for privacy fences. They're widely available, easy to handle, and cost-effective. 3.5-inch boards (1x4) create a more refined look but require more boards and cost more overall. 7.25-inch boards (1x8) cover ground faster but are heavier and more prone to warping.
For green (wet) pressure-treated lumber, use at least 0.5 inches of overlap. Fresh PT lumber shrinks significantly as it dries — boards touching today will have 1/4 to 1/2 inch gaps within 6 months. For pre-dried or kiln-dried lumber, you can butt boards tight with no overlap.
Post Depth and Concrete
Privacy fences catch wind like a sail, so post stability is critical. Each post should be buried at least one-third of its total length — that means 8-foot posts need 24-30 inches of burial for a 6-foot fence. We recommend 2 bags of 50-lb concrete per post for privacy fences (compared to 1 bag for lighter fence styles). In sandy soil or high-wind areas, consider 3 bags per post.
Tips for a Longer-Lasting Privacy Fence
- Use pressure-treated posts rated for ground contact (UC4A or UC4B)
- Set post tops at a slight angle or add caps so water drains off
- Leave 2 inches of clearance between the bottom board and the ground to prevent rot
- Apply stain or sealant within the first year — use our fence stain calculator to estimate gallons needed
Frequently Asked Questions
How many boards do I need for a privacy fence?
Multiply your fence length in inches by the reciprocal of the board width (minus overlap). For a 150-foot fence using 5.5-inch boards with no overlap, you need about 328 boards (150 × 12 / 5.5 = 327.3, rounded up). Add 10% for waste, cuts, and defective boards.
What is the best height for a privacy fence?
6 feet is the most popular height for residential privacy fences — tall enough to block sightlines while staying under most local permit thresholds. 8-foot fences offer maximum privacy but often require a building permit and cost 30-40% more in materials.
How much does a privacy fence cost per foot?
A wood privacy fence costs $15-$35 per linear foot for materials only. Pressure-treated pine is cheapest at $15-$22/ft, cedar runs $20-$30/ft, and redwood costs $25-$35/ft. Labor adds $15-$30/ft if hiring a contractor.
Should I overlap privacy fence boards?
Overlapping boards eliminates gaps as boards shrink and dry. New pressure-treated lumber can shrink up to 1/2 inch per board. A 1-inch overlap ensures zero gaps even after full shrinkage.
How deep should privacy fence post holes be?
Dig post holes one-third the total post length. For a 6-foot fence using 8-foot posts, dig 24-30 inches deep. In cold climates, go below the frost line (36-48 inches) to prevent heaving.
What is a board-on-board privacy fence?
A board-on-board fence alternates boards on each side of the rails so they overlap by 1-1.5 inches. It looks finished from both sides and blocks all light, but uses about 60% more boards than a standard privacy fence.