Fence Calculator
Estimate posts, rails, and pickets for a fence from its length. This free online construction & diy calculator runs entirely in your browser — no signup, no data sent anywhere.
Inputs
Results
How It Works (Formula & Method)
The number of sections is the fence length divided by the post spacing; posts are sections plus one. Rails are sections times the rails per section. Pickets are the total length in inches divided by the picket width plus its gap.
Worked Example
Below is a worked example using the calculator's default values. The same numbers are pre-filled in the form above so you can press Calculate and see the result without typing anything.
Inputs used:
- Fence Length (ft): 100
- Post Spacing (ft): 8
- Rails per Section: 2
- Picket Width (in): 5.5
- Gap Between Pickets (in): 0
With these inputs, the calculator computes the metrics shown in the Results panel. Change any value and press Calculate again to see how the result responds — the live widget and the chart both update instantly.
Frequently Asked Questions
What does the Fence Calculator compute?
The Fence Calculator takes 5 input values and returns 4 results. Estimate the posts, rails, and pickets needed to build a fence from the total run length, the post spacing, and your picket width and gap.
Is my data sent to a server?
No. The Fence Calculator runs entirely in your browser using static JavaScript. Your inputs are never transmitted to CalculatorHive or any third party, and nothing is stored after you close the page.
Is this calculator free to use?
Yes. Every calculator on CalculatorHive is completely free. There is no signup, no paywall, and no usage limit. The site is supported by display advertising and affiliate partnerships, which are clearly labeled.
How accurate is the result?
The math is mathematically exact for the inputs you provide. Real-world accuracy depends on how accurately your inputs reflect the real situation — defaults are typical values, not guarantees.