Fence Calculator - Free Online Tool

Estimate materials and costs for your fencing project

Planning a fence project involves far more than just measuring your yard. You need to know how many posts to buy, how deep to dig each post hole, how many pickets, rails, and fasteners to order — and critically, what the whole project will cost. Our Fence Calculator takes the guesswork out of material estimation so you can walk into the lumber yard or fence supplier with a precise shopping list and a realistic budget. The calculator handles all major fence types: pressure-treated wood, cedar, redwood, vinyl, chain-link, aluminum, and composite. For wood fences, it calculates posts, sections, pickets, rails, total rail length, and nails. For all fence types it produces a cost estimate range broken down into materials and labor. A built-in cost comparison chart shows you at a glance how different fence materials compare in price for your specific project dimensions. Getting the post count right is the foundation of any fence estimate. Our calculator uses the standard formula: posts = ceiling(fence length ÷ post spacing) + 1, always rounding up so you never come up short. Gates require two additional posts each, and we handle gate openings separately so they do not inflate your picket and rail counts. Post hole depth follows the industry rule of thumb — bury at least one-third of the total post length underground, which works out to roughly half the above-ground fence height. We also calculate the approximate volume of concrete needed for each post hole so you can buy the right number of concrete bags. For wood-style fences, the calculator supports both standard solid fencing and shadowbox (board-on-board) fencing. Standard fencing places pickets side by side with a set gap between them. Shadowbox fencing alternates pickets on opposite sides of the rails, producing a staggered pattern that allows airflow while maintaining privacy from most angles. This pattern uses roughly 40% more pickets than a solid fence of the same length. You can also toggle between face-nailed and toe-nailed rail attachment, which changes how rail length is measured: face-nailed rails span the full post spacing, while toe-nailed rails are cut shorter to fit between posts. A 10% material overage is applied by default — a widely accepted industry practice to account for cuts, defects, and on-site adjustments. You can turn this off if you prefer to calculate exact theoretical quantities. All inputs support both imperial (feet and inches) and metric (meters and centimeters) measurements, making the calculator useful for projects in any country. Cost estimates are provided as a range (low to high per linear foot) based on current market averages for each fence material. Labor is estimated separately at roughly 50% of material cost, which is a widely cited rule of thumb for residential fencing projects. Actual costs vary by region, fence contractor, and current material prices, so use these estimates as a planning guide rather than a final quote. For a precise quote, contact three or more local fence contractors with your project dimensions.

Understanding Fence Estimation

What Does a Fence Calculator Estimate?

A fence calculator estimates all the materials you need to build a fence of a given length and height. The core outputs are the number of posts, sections (spans between posts), pickets or boards, horizontal rails, fasteners, and an estimated cost range. For post installation, it also calculates the required post length (fence height × 1.5) and post hole depth (fence height × 0.5). These calculations ensure you buy exactly the right amount of material — rounding up to the nearest whole unit so you never arrive at the job site a few pickets short. The calculator also produces a concrete volume estimate for post hole filling, which helps you buy the correct number of ready-mix concrete bags.

How Are Fence Materials Calculated?

The calculation starts with the total fence length. Posts = ceiling(length ÷ post spacing) + 1. Sections = posts - 1. Each gate opening adds two extra posts but removes that span from the picket and rail count. Pickets = ceiling(fence length in inches ÷ (picket width in inches + picket gap in inches)). For shadowbox fencing, pickets = ceiling(fence length in inches ÷ picket width) × 2. Rails = rails per section × sections. Rail length per section equals post spacing for face-nailed rails, or (post spacing - post width) for toe-nailed rails. Nails = (total rails × 4) + (pickets × rails per section × 2). All piece counts are rounded up to whole numbers. An optional 10% overage multiplier accounts for waste and measurement errors.

Why Does Accurate Estimation Matter?

Underestimating materials means making extra trips to the store, causing project delays and potentially buying from a different batch with mismatched color or grain. Overestimating wastes money on materials you cannot return. Accurate estimation also helps you compare contractor bids intelligently — if one quote lists 150 pickets and another lists 210 for the same fence, you can ask why the discrepancy. Cost estimation helps set a realistic budget before you start. Fencing projects range from roughly $10 per linear foot for chain-link to $50 per linear foot for composite, not counting installation labor. Knowing your material costs up front prevents budget surprises mid-project.

Limitations and Caveats

This calculator provides estimates based on standard residential fence construction practices. Actual quantities may differ due to site-specific factors such as uneven terrain, existing structures, soil type, and local building codes. Post hole depth requirements vary by region — areas with deep frost lines (northern states and Canada) may require holes 48 inches or deeper regardless of fence height. Local wind load requirements in hurricane or high-wind zones may mandate closer post spacing or larger post dimensions. The cost ranges used are nationwide averages and can vary significantly by region, season, and current lumber prices. Always consult a local fence contractor for a precise materials list and labor quote before purchasing materials.

Fence Material Formulas

Post Count

Posts = ⌈Perimeter ÷ Post Spacing⌉ + 1 + (Gates × 2)

Divides the total fence length by the spacing between posts, rounds up, adds one for the end post, and adds two extra posts per gate opening.

Rails per Fence

Total Rails = (Posts − 1) × Rails per Section

Each section between two posts requires the specified number of horizontal rails, typically 2 for short fences or 3 for privacy fences 6 ft and taller.

Picket Count (Standard)

Pickets = ⌈Fence Length (in) ÷ (Picket Width (in) + Gap (in))⌉

Calculates the number of pickets needed for a solid fence by dividing the total fence length in inches by the combined width of one picket plus the gap between pickets.

Picket Count (Shadowbox)

Pickets = ⌈Fence Length (in) ÷ Picket Width (in)⌉ × 2

Shadowbox fencing alternates pickets on both sides of the rails, requiring approximately twice the pickets of a standard fence minus the overlap.

Fence Reference Tables

Fence Material Quantities per 100 Linear Feet

Approximate material counts for a 6 ft tall fence with 8 ft post spacing and 3 rails per section.

Material Type	Posts	Rails	Pickets/Panels	Cost Range (per lin ft)
Pressure-Treated Wood	14	39	~340 pickets	$10–$20
Cedar	14	39	~340 pickets	$15–$30
Vinyl	14	N/A (panel)	13 panels	$20–$40
Chain-Link (4 ft)	18 (6 ft spacing)	3 rails	100 ft fabric	$8–$15
Aluminum	14	3 rails	13 panels	$25–$40
Composite	14	39	~340 boards	$30–$50

Fence Type	Standard Spacing	Max Spacing	Notes
Wood Privacy (6–8 ft)	8 ft	8 ft	Matches standard rail length
Wood Picket (3–4 ft)	6–8 ft	8 ft	6 ft for decorative fences
Vinyl Panel	6–8 ft	8 ft	Per panel width, usually 6 or 8 ft
Chain-Link	6 ft	10 ft	Closer spacing for taller fences
Aluminum Panel	6 ft	8 ft	Match panel width exactly
High Wind Areas	6 ft	6 ft	Reduce spacing for wind resistance

Worked Examples

Materials for a 150 ft Privacy Fence

A homeowner is building a 6 ft tall pressure-treated wood privacy fence, 150 linear feet, with 8 ft post spacing, 3 rails per section, 3.5-inch pickets with no gap, and one 4 ft gate.

Calculate posts: ⌈150 ÷ 8⌉ + 1 = 20 line posts + 2 gate posts = 22 posts

Calculate sections: 22 − 1 = 21 sections (minus the gate span)

Fenceable length: 150 − 4 (gate) = 146 ft = 1,752 inches

Calculate pickets: ⌈1,752 ÷ 3.5⌉ = 501 pickets

Calculate rails: 20 sections × 3 = 60 rails

Add 10% overage: 501 × 1.10 = 552 pickets, 60 × 1.10 = 66 rails

Order 22 posts (9 ft long), 66 rails (8 ft 2×4s), 552 pickets (6 ft 1×4s), and approximately 11 bags of concrete for post holes.

Cost Estimate for a 6 ft Wood Fence (200 ft)

A contractor is estimating costs for a 200 ft cedar privacy fence, 6 ft tall, with 8 ft spacing, one 4 ft walk gate, and one 10 ft double gate.

Posts: ⌈200 ÷ 8⌉ + 1 + (2 × 2) = 26 + 4 = 30 posts

Fenceable length: 200 − 4 − 10 = 186 ft

Pickets (3.5 in, no gap): ⌈186 × 12 ÷ 3.5⌉ = 638 pickets + 10% = 702

Material cost at $15–$30 per linear foot: 200 × $15 = $3,000 to 200 × $30 = $6,000

Estimated labor at 50% of materials: $1,500–$3,000

Total project estimate: $4,500–$9,000 installed, depending on cedar grade and local labor rates.

How to Use the Fence Calculator

Enter Your Fence Length and Height

Measure the total linear footage around the perimeter you plan to fence. Enter your desired fence height — 4 ft, 6 ft, and 8 ft are the most common residential heights. Use the quick-select buttons for common heights or type a custom value. Toggle between imperial and metric units at the top.

Set Post Spacing and Material Type

Choose post spacing — 8 ft is standard for most wood privacy fences; 6 ft is common for heavier fences or areas with strong winds. Select your fence material from the seven options: pressure-treated wood, cedar, redwood, vinyl, chain-link, aluminum, or composite. Each material affects the cost estimate shown.

Configure Gates and Wood Options

Enter the number of gate openings and each gate's width. Gates add two posts each but remove that span from picket and rail calculations. For wood fences, configure rails per section (typically 3), picket width (3.5 in standard), picket gap, and nail type. Toggle shadowbox mode for board-on-board fencing, which alternates pickets on both sides of the rails.

Review Your Materials List and Cost Estimate

The results panel shows your complete materials list: total posts, sections, pickets, rails, nails, concrete volume, and surface area. The cost estimate card shows materials and labor ranges for your chosen material, plus a comparison chart for all seven materials so you can evaluate alternatives. Use Export CSV to save your list or Print to create a physical shopping list.

Frequently Asked Questions

How deep should fence post holes be?

The general rule is to bury at least one-third of the total post length underground. For a 6-foot fence, you would use 9-foot posts and dig holes 3 feet deep. However, depth also depends on your local frost line — in cold climates, post holes must extend below the frost line to prevent heaving. The frost line ranges from about 12 inches in southern states to 48 inches or more in northern states and Canada. Always check local building codes, which specify minimum post hole depths for your area. Deeper holes with concrete collars provide the most stable installation.

What is the standard post spacing for a wood privacy fence?

The most common post spacing for residential wood privacy fences is 8 feet on center, which is also the standard length for fence rail lumber. This spacing works well for 6-foot and 8-foot privacy fences with standard 2x4 or 2x6 rails. Some installers prefer 6-foot spacing for taller fences, fences in high-wind areas, or fences built with heavier materials that require more support. Closer spacing (4–6 feet) is recommended for chain-link fences carrying tension fabric. Always use ceiling division when counting posts: a 100-foot fence with 8-foot spacing needs 13 posts (ceiling(100/8) + 1 = 14 posts).

What is a shadowbox fence?

A shadowbox fence, also called a board-on-board fence, alternates pickets on opposite sides of the horizontal rails. From straight on, the fence appears solid because the alternating pickets overlap each other. From an angle, you can see through the gaps. This design uses approximately 40% more pickets than a standard solid fence because pickets on both sides of the rails must cover the entire span. Shadowbox fences are popular because they look the same from both sides (unlike standard privacy fences, which have a 'good side' and a 'bad side'), they allow airflow that reduces wind pressure on the fence, and the design is generally considered more attractive than a flat board fence.

What is the difference between face-nailed and toe-nailed rails?

Face-nailed rails are attached to the front face of posts, so they span the full distance from the center of one post to the center of the next. This means rail length equals the post spacing. Toe-nailed rails are attached at an angle into the side of the post, fitting snugly between the posts rather than overlapping them. Toe-nailed rail length equals post spacing minus the post width. Face-nailing is faster and stronger for most applications. Toe-nailing is sometimes preferred for a cleaner appearance since the rail ends are hidden. This difference affects how much rail lumber you need to purchase, so the calculator adjusts total rail length accordingly.

How much does it cost to install a fence?

Fence installation costs vary widely depending on material, height, terrain, and location. Nationally, residential fence installation runs roughly $10–$20 per linear foot for pressure-treated wood and chain-link, $15–$30 for cedar, $20–$40 for vinyl, $25–$40 for aluminum, and $30–$50 for composite materials. These figures include both materials and labor. Labor typically accounts for about 50% of the total cost. A 100-foot cedar fence might cost $1,500 to $3,000 installed. Always get at least three quotes from local fence contractors, as regional labor rates and material availability significantly affect pricing.

Why should I add a 10% overage to my material order?

Adding a 10% materials overage is standard practice in the construction industry. It accounts for boards that split or crack during installation, cuts made at the end of a fence run that produce short leftover pieces, slight measurement errors in the original fence layout, and materials damaged during delivery or storage. Without an overage, a single miscalculation or defective board can stall your project while you wait for a new delivery. The 10% buffer ensures you have enough material to complete the fence without additional trips to the store, which often results in color or grain variation if materials come from different production batches.