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Fence Calculator

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Enter your fence line length and post spacing to find exactly how many posts and panels (or pickets) you need.

Fence Calculator

Live
Posts needed
20
Panels/sections
19
A closed loop (like a full yard perimeter) needs the same number of posts as panels, since the last panel connects back to the first post.

The formula

Panels = ceiling(Total length / Post spacing) Posts (straight run) = Panels + 1 Posts (closed loop) = Panels
Example

150 ft of fence line with posts every 8 ft, as a straight run: panels = ceiling(150/8) = 19, posts = 20. If that same length instead closes into a loop around a yard, it would need only 19 posts, since the last panel connects back to post #1.

Step-by-step guide

  1. Measure the total length of fence line you're building.
  2. Choose your post spacing - 6-8 ft is common for wood privacy fencing, while some materials and styles use different standard spacing.
  3. Indicate whether it's a straight run or a closed loop around a full perimeter, since a loop needs one fewer post than a straight line of the same length.

Why post spacing matters for cost and strength

Shorter post spacing (like 6 ft instead of 8 ft) means more posts and more digging, but generally a stronger, more rigid fence line, especially in windy areas or for taller fences. Manufacturer specifications for pre-built panels often dictate a fixed spacing that matches the panel width exactly, so check your specific fencing product before assuming a spacing.

Common mistakes

Using the same post count for a straight run and a closed loop of the same length - a loop needs one fewer post, since the ends connect.
Not accounting for gates separately - a gate opening typically needs its own dedicated posts sized for the gate hardware, which this general calculator doesn't itemize.

Frequently asked questions

How deep should fence posts be set?

A common guideline is at least one-third of the post's above-ground height, and often below your local frost line to prevent heaving - check local codes and soil conditions for your specific area.

Does this account for gates?

No - gates typically need dedicated, often larger posts to support the hardware and swinging weight. Plan gate locations and posts separately from this general fence line calculation.

What post spacing should I use for a chain-link fence?

Chain-link commonly uses posts every 10 feet, somewhat wider than typical wood privacy fencing - check your specific fence system's requirements.

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