Fence Calculator โ Posts; Rails; and Pickets Needed
Calculate fence materials needed. Enter length and style to get posts; rails; pickets; concrete; and hardware estimates.
A fence project requires precise material counts to stay on budget. This calculator breaks down posts; rails; pickets; concrete for post holes; and hardware needed for your total fence length and style.
How many fence posts do I need?
Divide your fence length by 8 (standard spacing) and add 1 for the end post. A 100-foot fence needs 14 posts. Add extra posts for corners and gate openings.
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How This Material Calculator Works
This calculator uses industry-standard formulas to estimate the quantity of materials needed for your project. It factors in standard waste allowances (typically 5-10% depending on material type) so you purchase enough without significant overbuying. Measurements are based on common product dimensions available at major retailers and building supply stores. For best results, measure your project area carefully and round up to the nearest whole unit when purchasing.
Tips for Accurate Material Estimates
Always measure twice before ordering materials. Account for cuts, corners, and irregular shapes by adding 10% extra for most materials. For concrete and masonry, consider the subgrade preparation and drainage requirements. Check local building codes before starting any project โ permits may be required for structural work, fencing over certain heights, or decks above ground level. Buy materials from the same batch to ensure color consistency, especially for tiles, pavers, and paint.
Key Information
| Parameter | Details |
|---|---|
| Post Spacing | 8 feet on center (typical) |
| Rails per Section | 2-3 horizontal rails |
| Pickets per Section | About 15 per 8-ft section |
| Post Hole Depth | 1/3 of post length + 6 in |
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Use Calculator NowFrequently Asked Questions
How many fence posts do I need?
Divide your fence length by 8 (standard spacing) and add 1 for the end post. A 100-foot fence needs 14 posts. Add extra posts for corners and gate openings.
How much does a wood fence cost per foot?
Cedar privacy fence: $15-$30 per linear foot for materials. Pressure-treated pine: $10-$20. Vinyl: $20-$40. Professional installation adds $5-$15 per foot.
How deep should fence posts be?
Fence posts should be buried 1/3 of their total length plus 6 inches of gravel base. A 6-foot fence uses 8-foot posts buried 2.5-3 feet deep in concrete.
How much extra material should I order?
For most construction materials, order 10% extra to account for cuts, waste, breakage, and mistakes. For tiles and pavers, add 15% if using a diagonal or herringbone pattern. Concrete should include a 5-10% overage since running short mid-pour is costly. Always keep leftover materials for future repairs.
Do I need a permit for my project?
Permit requirements vary by location and project scope. Generally, structural work (walls, roofing, foundations), electrical, plumbing, fences over 6 feet, and decks above 30 inches require permits. Cosmetic work like painting, flooring, and landscaping usually does not. Check with your local building department before starting.
How do I convert between material units?
Common conversions: 1 cubic yard = 27 cubic feet. 1 square (roofing) = 100 sq ft. 1 board foot = 1 inch ร 12 inches ร 12 inches of lumber. Concrete is sold in cubic yards; multiply length ร width ร depth in feet and divide by 27. Our calculator handles these conversions automatically.
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Last updated: March 2026