Calwarden

Fence Material Estimator

Estimate panels, posts, and concrete for a fence line.

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Inputs

ft
ft

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Results

Panels Needed
Posts Needed14
Concrete Bags28

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Assumptions

  • The estimate assumes a simple straight run using standard panels.
  • Fence length and panel width must be positive measurements in feet.
  • Concrete assumes about two 50-60 lb bags per post and does not account for gates or corner details.

Sensitivity preview

Fence Length -10%: Panels Needed 12

Fence Length Current: Panels Needed 13

Fence Length +10%: Panels Needed 14

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About this Fence Estimator

Building a fence adds privacy, security, and value to your property. Whether you are using pre-made panels or building from scratch, calculating the number of posts and sections accurately prevents multiple trips to the lumber yard. This calculator estimates the core components for a standard panel fence.

Who this calculator is for

  • Homeowners planning backyard, garden, or side-yard fence projects.
  • Fence installers estimating panel counts, posts, and concrete for a straight run.
  • DIY builders comparing 6-foot and 8-foot fence panel layouts.

When to use it

  • Estimate how many prefab panels fit along a measured fence run.
  • Count posts and rough concrete needs before digging holes.
  • Adjust the plan for different panel widths on the same straight fence line.

How to use this calculator

  1. Measure the total Fence Length of the straight run you want to build.
  2. Enter the Panel Width (Standard sizes are 6ft or 8ft).
  3. The result shows the number of Panels, Posts, and estimated Concrete Bags.

Key assumptions

  • The estimate assumes a simple straight run using standard panels.
  • Fence length and panel width must be positive measurements in feet.
  • Concrete assumes about two 50-60 lb bags per post and does not account for gates or corner details.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

The math assumes a standard straight run: 1. Panels: Total Length / Panel Width (Rounded up). 2. Posts: Panels + 1 (Assuming a post at the start and end of every section). 3. Concrete: 2 bags (50-60lb) per post is a standard rule of thumb for average soil conditions.

Inputs explained

Fence Length

The total linear footage of the fence line. Measure along the ground where the fence will run.

Panel Width

The width of the fence sections you are buying. 8 feet is standard for wood privacy fences; 6 feet is common for dog-ear or picket fences.

Understanding your results

The Panels Needed is an integer; you can't buy half a panel. You will likely need to cut the last panel to fit. Posts Needed assumes a simple straight run with a post at each end; corners, gates, and closed loops usually need additional posts.

Example scenarios

Backyard Fence Run

150 ft straight run. 8 ft panels. Panels = ceil(150/8) = 19. Posts = 20. Concrete = 40 bags.

Small Run

40 ft run. 6 ft panels. Panels = ceil(40/6) = 7. Posts = 8. Concrete = 16 bags.

Key Features

  • Panel Estimator
  • Post Counter
  • Concrete Estimation

Things to Keep in Mind

Assumes a straight run with evenly spaced panels. Does not account for closed loops, gates, corners, or corner bracing specifically.

Tips & Best Practices

  • Always call 811 (in the US) to check for underground utilities before digging post holes.
  • If you have gates, subtract the gate width from your total length, but remember you still need heavy-duty posts for the gate hinges.
  • Pressure-treated lumber is essential for posts that touch the ground to prevent rot.

Glossary of Terms

Post
The vertical support embedded in the ground.
Panel
The pre-assembled section of fence (pickets and rails) installed between posts.
Frost Line
The depth to which groundwater in soil is expected to freeze. Posts must be set below this line to prevent heaving.

Frequently Asked Questions

How deep should fence posts be?
Generally, posts should be buried at least 1/3 of their total length (e.g., 2-3 feet for a 6ft fence), or below the frost line in your area (often 24-36 inches) to prevent frost heave.
Do I need concrete for every post?
Concrete is highly recommended for stability, especially for corner posts, gate posts, and privacy fences that catch the wind. Some intermediate posts can be set with packed gravel in stable soil.
How far apart should fence posts be?
Standard spacing is 6 to 8 feet, depending on the length of the rails or panels you are using. Do not exceed 8 feet to prevent sagging.