Fence Material Calculator

Post, Rail, and Picket Quantities Explained

Every fence breaks down into the same structural elements regardless of material: posts in the ground, horizontal rails connecting them, and infill (pickets, panels, or fabric) attached to the rails. The quantities depend on fence length, height, and post spacing. Here is how each component scales.

| Component | Formula | 4 ft Fence | 6 ft Fence | 8 ft Fence | |---|---|---|---|---| | Posts (4×4 PT) | ceil(length/spacing) + 1 + (2 × gates) | Same for all heights | Same | Same | | Post length | fence height + burial depth | 4 + 2 = 6 ft | 6 + 2.5 = 8.5 ft | 8 + 3 = 11 ft | | Rails per bay | 2 for ≤6 ft, 3 for 8 ft | 2 | 2 | 3 | | Pickets per foot | 12 / (picket width + gap) | 2.09 (5.5" + 0.25") | Same | Same | | Concrete per post | bags by depth | 1.5 bags (18" deep) | 2 bags (24" deep) | 3 bags (36" deep) |

Post burial depth follows the one-third rule: bury one-third of the total post length. A 6-foot fence needs about 30 inches in the ground (8.5-foot post), and an 8-foot fence needs 36 inches (11-foot post). The post hole diameter should be three times the post width — a 4×4 post (actual 3.5 inches) goes in a 10-inch diameter hole. A 10-inch hole 24 inches deep holds about 0.8 cubic feet of concrete, which is roughly two 50-lb bags of dry mix.

Corner and end posts carry more force than line posts because they resist fence loads from two or three directions. Some builders use 6×6 posts at corners and gates for added rigidity. The calculator uses uniform 4×4 posts throughout, but upsizing corner posts to 6×6 adds about $8-$12 per post and noticeably improves fence stability at direction changes.

For the structural side of post sizing — how deep a post needs to be based on soil conditions, wind loads, and fence height — the [fence post depth calculator](/calculators/materials/fence-post-depth-calculator) provides a more detailed analysis based on your specific conditions.

Material Selection: Wood, Vinyl, Chain-Link, and Composites

Each fence material trades off between upfront cost, maintenance burden, lifespan, and appearance. The right choice depends on your budget horizon and your tolerance for periodic upkeep.

Pressure-treated wood (PT pine or fir) is the most popular residential fence material in North America. Posts are 4×4 treated to ground-contact rating (UC4A or UC4B), rails are 2×4 or 2×3 treated to above-ground rating (UC3B), and pickets are 1×6 dog-ear boards. Treated wood costs $12-$20 per linear foot in materials and lasts 15-25 years with periodic staining or sealing every 2-3 years. Without stain, untreated pine fences grey within a year and rot within 5-8 years. Cedar and redwood cost 50-100% more than treated pine but resist rot naturally and weather to an attractive silver-grey without treatment.

Vinyl (PVC) fencing arrives as a kit: posts, rails, and panels in matched sections. The material costs 30-75% more than treated wood ($20-$35 per linear foot in materials) but eliminates all maintenance. Vinyl does not rot, does not need paint or stain, and resists insect damage. The downside is limited colour options (mostly white, tan, and grey), brittleness in extreme cold (vinyl can crack if struck below 0 deg F), and difficulty repairing individual sections. A damaged vinyl panel typically requires replacing the entire panel.

Chain-link is the cheapest fence material at $5-$12 per linear foot. It does the job of defining property boundaries and containing pets without any visual privacy. Adding privacy slats ($3-$5 per linear foot) or fabric screens ($2-$4) improves privacy but reduces wind resistance. Chain-link lasts 20+ years with zero maintenance if galvanised; vinyl-coated chain-link (black or green) lasts longer and looks better for a modest premium.

How to Order and Avoid Shortages

Running out of materials during a fence build means stopping work and making another trip — or worse, waiting for a special-order delivery. Here is how experienced builders order to avoid shortages without massive over-ordering.

1. **Measure twice, including obstacles.** Walk the entire fence line with a tape measure and mark post locations with stakes or spray paint. Note trees, utility boxes, rock outcrops, and grade changes that affect post placement. A gas line that runs 2 feet inside the property line might force your fence to jog around it, adding fence length and extra posts.

2. **Call 811 before you dig.** Every US state requires utility location before excavation. Call 811 or submit an online ticket at least 3 business days before you plan to dig post holes. The locate service marks buried gas, electric, water, cable, and sewer lines with paint or flags. Hitting a gas line is dangerous; hitting a fibre optic line is expensive. This step is free and legally required in all 50 states.

3. **Order posts and concrete with zero waste tolerance.** Posts and concrete bags are cheap relative to their importance — running one post short stops the entire project. Order 2-3 extra posts and 5-10 extra bags of concrete. The unused posts work as tomato stakes and the concrete stores indefinitely in a dry location.

4. **Order pickets with 5-10% overage.** Picket counts from the calculator are theoretical minimums. In practice, you will find warped boards in the bundle (reject any with more than 1/4-inch warp per foot), break a few during cutting, and need extras at corners and gates. Ten percent overage is standard for picket fences.

5. **Buy all materials from the same lot when possible.** Wood colour and grain vary between production runs. Mixing batches creates visible colour bands in the finished fence that staining cannot fully hide. If your order is too large for a single delivery, ask the yard to pull from the same production lot.

DIY vs. Professional Installation: The Cost Split

Fence building is one of the more accessible DIY projects for homeowners with basic tool skills. The work is physically demanding but conceptually straightforward: dig holes, set posts, attach rails, hang pickets. But the economics of DIY vary depending on the fence type and your local labour market.

**Wood picket (DIY-friendly):** Materials run $12-$20 per linear foot. Professional installation adds $15-$30 per foot for labour, bringing the total to $27-$50 per foot installed. A homeowner with a post hole digger (rental: $40-$80/day for a two-person auger), a level, a circular saw, and a drill can build 30-50 feet per day. A 150-foot fence is a 3-4 day project for one person, or a weekend with a helper. The labour savings on a 150-foot fence: $2,250-$4,500.

**Pre-built panels:** Panels are faster to install than individual pickets — lift, level, attach. But the panels are heavy (60-90 lbs for a 6×8 panel) and awkward to handle alone. Two people are essential. The panel approach reduces the per-foot DIY time to about 60-80 feet per day, making a 100-foot fence a weekend project. Professional installation costs less per foot than picket fences because the labour is simpler.

**Vinyl:** Vinyl fence systems use routed posts and slide-in rails that require precise post spacing. A post that is 1/2 inch too close or too far from its neighbour means the rail does not seat properly. Most vinyl manufacturers void their warranty if the fence is not installed by a certified installer. If warranty matters to you, hire a pro. If you are confident in your precision, DIY vinyl saves the same $15-$30 per foot in labour.

**Chain-link:** Chain-link installation requires tensioning fabric, which needs specialised tools (a fence stretcher and come-along). The tension must be uniform across the entire run to avoid sagging. This is one fence type where professional installation is worth the cost for most homeowners — the tool rental ($80-$120/day) and learning curve make the DIY savings marginal on a single project.

Permits, Property Lines, and Neighbour Etiquette

Fence disputes are among the most common neighbourhood conflicts, and most of them are preventable with a survey, a permit, and a conversation.

A property survey ($300-$600) establishes the exact property line with legal precision. Do not rely on existing fences, visual landmarks, or "where the old fence was" to determine your property boundary. If your new fence crosses the property line even by inches, your neighbour can require you to remove it — and you absorb the full cost of removal and reinstallation on the correct line. The survey cost is insurance against a much more expensive mistake.

Most municipalities require a fence permit for fences over 4 feet tall and sometimes for any fence regardless of height. The permit process typically requires a site plan showing the fence location relative to property lines, a description of materials and height, and a fee of $25-$100. Setback requirements vary: some jurisdictions require fences to be set back 6 inches to 2 feet from the property line; others allow fences on the exact line. Front yard fences often have lower height limits (3-4 feet) than side and rear yard fences (6-8 feet).

The "good side out" convention places the finished (flat) side of the fence facing your neighbour and the rail-and-post side facing your yard. This is courtesy, not law, in most places — but a few municipalities codify it. Check your local fence ordinance before assuming. Some homeowners build a "good neighbour" or "shadowbox" fence that looks identical from both sides by alternating pickets on opposite sides of the rail.

Talk to your neighbours before building. A fence on or near the property line affects their property too. Many neighbours will agree to split the cost of a shared fence if you approach the conversation before breaking ground. Even if they decline to contribute, the conversation establishes goodwill and avoids the surprise of waking up to a fence crew they did not expect. Disputes after the fence is up cost far more to resolve — both financially and relationally — than a 15-minute conversation beforehand.

Worked Examples