BuildCalc Pro

Fence Calculator

Calculate the number of posts, panels, and total cost for your fencing project.

Written by the BuildCalc Pro Editorial TeamUpdated June 2026✓ Fact-checked

How to Estimate Materials for Your Fence Project

A well-planned fence project starts with accurate material estimation. Whether you are installing a privacy fence, picket fence, or chain link boundary, knowing exactly how many posts, panels, and gates you need prevents costly mid-project trips to the hardware store.

Standard fence panels come in 6-foot or 8-foot widths. Posts are typically spaced to match panel width, with one post per panel section plus one additional post at the end. For a 100-foot fence using 8-foot panels, you would need approximately 13 panels and 14 posts.

Fence costs vary significantly by material. Wood privacy fencing costs $15-$30 per linear foot installed. Vinyl fencing runs $20-$40 per linear foot. Chain link is the most economical at $10-$20 per linear foot. Wrought iron or aluminum decorative fencing costs $25-$50+ per linear foot.

Post depth is critical for fence stability. In most climates, fence posts should be set in concrete at a depth equal to one-third of the total post length plus 6 inches for gravel drainage. A 6-foot tall fence needs posts at least 30 inches deep.

Gate placement should be considered early in planning. Standard walk-through gates are 3-4 feet wide, while drive-through gates need 10-16 feet of clearance. Each gate typically costs $100-$500 depending on material and size.

How to Use This Calculator

1. Select Imperial or Metric units. 2. Enter the total length of fence needed. 3. Choose a fence style — this sets typical material costs. 4. Adjust panel width if different from the standard 8 ft. 5. Add gates and set labor rate per linear foot. 6. Click "Calculate" for a full cost breakdown. Tip: Measure the total perimeter minus any existing walls or structures.

Key Formulas

Number of Posts

(Fence Length ÷ Post Spacing) + 1 = Number of Posts

Divide total length by spacing (typically 6-8 ft), then add 1 for the starting post. Add extra posts for corners and gate openings.

Number of Panels

Fence Length ÷ Panel Width = Number of Panels

Pre-made panels are typically 6 or 8 feet wide. Round up to the nearest whole number.

Pickets (Board Fencing)

(Fence Length × 12) ÷ (Picket Width + Gap) = Number of Pickets

Convert fence length to inches, then divide by picket width plus gap. Standard pickets are 3.5" wide with 0-0.5" gap for privacy fencing.

Fence Material Cost Comparison

Cost per linear foot by fence material
MaterialCost/Linear FootLifespanPrivacyMaintenance
Chain Link$10–$2020+ yearsNoneVirtually none
Wood Picket$12–$2510–15 yearsPartialStain/paint every 2–3 years
Wood Privacy$15–$3010–20 yearsFullStain/seal annually
Vinyl/PVC$20–$4020–30 yearsFullOccasional cleaning
Aluminum$25–$4520–30 yearsNoneVirtually none
Wrought Iron$25–$5050+ yearsNoneRust treatment every 3–5 years
Composite$25–$5025–50 yearsFullMinimal

Prices include installation. DIY saves 40–60% on labor costs.

Frequently Asked Questions

How many fence panels do I need for 200 feet?

For a 200-foot fence using standard 8-foot panels, you need 25 panels and 26 posts. Using 6-foot panels, you would need approximately 34 panels and 35 posts.

How deep should fence posts be?

Fence posts should be buried at least one-third of their total length. For a standard 6-foot fence with 8-foot posts, dig post holes at least 30 inches deep, plus 6 inches for gravel drainage at the bottom.

How much concrete do I need per fence post?

Each fence post typically requires 1-2 bags (50-80 lbs each) of concrete mix, depending on the post hole diameter. A standard 10-inch diameter hole that is 30 inches deep needs about 1.5 bags of 80-pound concrete.

What is the cheapest fence to install?

Chain link fencing is the most economical option at $10-$20 per linear foot installed. Basic wood picket fencing is also affordable at $12-$25 per linear foot. DIY installation can save 40-60% on labor costs.

How many fence posts do I need for 100 feet of fencing?

For 100 linear feet with 8-foot post spacing, you need 14 posts (100 ÷ 8 = 12.5 sections, rounded up to 13, plus 1 for the starting post). With 6-foot spacing, you need 18 posts. Add extra posts for gate openings and corners.

Do I need a permit to build a fence?

Most areas require permits for fences over 6 feet tall. Some HOAs and municipalities regulate height, material, and setback from property lines even for shorter fences. Always check local codes and property surveys before building. Permit costs typically range from $20-$200.