Quick start
- Enter the full fence perimeter or run length in feet.
- Enter panel width and post spacing in feet.
- Enter gate count and gate width so the calculator can remove gate openings.
Best uses
These are the situations this tool is meant for. If your task is close to one of these, the examples and notes below can help you choose the right inputs.
- Estimate panels for a backyard fence.
- Plan post counts from a chosen spacing.
- Account for one or more gates.
- Compare 6-foot and 8-foot panel layouts.
What this calculator is solving
The Fence Calculator gives a rough material count for simple panel fencing. It subtracts gate width, estimates panels, and counts line and gate posts.
You do not need to memorize the formula first. Start by matching each input label on the calculator to the number, date, unit, or setting you actually have.
The formula in plain language
In plain language: The calculator subtracts gate width from total perimeter, divides the remaining run by panel width, estimates line posts from spacing, and adds two gate posts per gate. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
If that sounds abstract, use the example cards on the calculator page. They show a complete set of inputs and the kind of answer you should expect.
How to read the answer
Read the headline result first. Then look at the smaller supporting lines because they explain the parts behind the answer, such as totals, units, ranges, or formula steps.
- Panels needed rounds up the remaining fence run divided by panel width.
- Fence run after gates shows how much perimeter is still filled with panels.
- Total posts includes line posts plus two posts per gate.
Common mistakes to avoid
If the answer looks strange, the most likely cause is a small input mismatch: the wrong unit, date, weight, scale, mode, or policy assumption.
- Do not forget corner, end, brace, and terminal post requirements.
- Do not ignore slope, soil, setbacks, utilities, and permits.
- Gate hardware, latch clearance, and custom panel cuts need separate planning.
Research and references
These references shaped the calculator assumptions, unit choices, or safety notes.
Examples from the calculator
Panels and posts
Gate-adjusted estimate
Simple run count
FAQ in plain language
When should I use the Fence Calculator?
Use it when your task matches one of these common needs: Estimate panels for a backyard fence. Plan post counts from a chosen spacing. It works best when you already know the values, dates, units, or settings the page asks for.
What is the Fence Calculator doing with my inputs?
In plain language: The calculator subtracts gate width from total perimeter, divides the remaining run by panel width, estimates line posts from spacing, and adds two gate posts per gate. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
What should I double-check before trusting the answer?
Real fences need corner posts, end posts, bracing, slope handling, permits, setbacks, gate hardware, terrain checks, and local code review. Also check that you used the right unit, date, scale, or mode because small input changes can change the result.
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Privacy and copying results
Recent answers stay visible only while you work in the current browser tab. They are not sent to a server.
Use Copy answer when you want to paste the expression and result into notes, homework, a message, or another document. Check the units and assumptions before copying.