Fence Calculator
Posts and panels needed.
Posts and panels needed.
How to use Fence Calculator
- Enter fence length, post spacing, and rails per section
- Add any gates to subtract their width from the run
- Read the posts, sections, and rails you need
About Fence Calculator
The Fence Calculator turns a few measurements into a clear materials list for any fencing run. Enter your total fence length, your post spacing (on center), and how many rails you want per section, in either feet or meters, and it instantly returns the number of posts, sections, and rails the job needs. Adding a gate subtracts its width from the run and hangs it between its own pair of posts, so the counts stay accurate for a fence that isn't one unbroken line.
Because it works from post spacing rather than fixed panel sizes, you can test different layouts fast — tighter spacing for a windy or sloped site, wider spacing to trim post count and cost. The output is a quantity estimate: it tells you how much framing material to buy, which is the basis you then use to price the job against your local supplier, plan how deep to dig each post, and work out pickets and concrete per hole. It's a starting point for a bill of materials, not a fixed quote, so add a margin for corners, end posts, cuts, and waste before you order.
Everything is free with no sign-up, no limits, and no watermarks. Each calculation runs entirely in your browser — your measurements are never uploaded to a server and nothing is stored.
Frequently asked questions
- Is the fence calculator free to use?
- Yes, it's 100% free with no account, no sign-up, and no usage limits. You can run as many fence estimates as you like.
- Is my data uploaded or stored anywhere?
- No. All calculations happen locally in your browser using JavaScript. Your fence dimensions never leave your device and nothing is saved or sent to a server.
- How does it calculate the number of posts and sections?
- Sections are your fence length divided by the post spacing, rounded up. Posts equal the number of sections plus one, for a post at each join and a final closing post. Rails equal sections multiplied by your rails-per-section value, and each gate is hung between its own pair of posts.
- What is the best post spacing for a fence?
- A common default is 8 feet (about 2.4 meters) on center, which balances strength and cost for most wood and vinyl fences. Use tighter spacing on slopes, windy sites, or with heavier panels for extra rigidity.
- How do gates affect the material count?
- Each gate replaces a run of fencing, so the tool subtracts the gate width from your total length before counting sections and rails. It also adds two posts per gate to hang and latch it.
- How deep should fence posts be?
- A common rule is to bury about a third of the post's total length, with a minimum hole depth of roughly 2 feet for a standard 6-foot fence. In cold climates, dig below your local frost line so the posts don't heave over winter. This calculator gives you the post count and layout; use that to plan your digging.
- How much concrete do I need per fence post?
- For a typical 4x4 post in a hole about three times the post's width and two feet deep, plan on roughly one to three 50–60 lb bags of concrete mix per post, depending on hole size. Multiply that by the post count this tool gives you to estimate the total. Wider or deeper holes in soft ground need more.
- Does this calculate fence pickets?
- This tool counts the frame — posts, sections, and rails — rather than individual pickets. To estimate pickets, divide your fence length by the combined width of one picket plus the gap between boards; for example, 5.5-inch pickets with a 0.25-inch gap sit every 5.75 inches. Use the fence length you entered here as the starting figure.
- How do I estimate the total cost of my fence?
- Take the post, section, and rail counts from this calculator and multiply each by your local supplier's prices, then add pickets, concrete, gates, and hardware. Material cost varies widely by region and fence type, so pricing your own quantities is more accurate than a generic average. This gives you the quantities; your supplier gives you the rates.
- Does the estimate include installation or labor cost?
- No. This is a materials estimator, so it covers quantities of posts, sections, and rails, not labor. Professional installation is usually quoted per linear foot on top of materials and depends on terrain, fence height, and your area. Use your fence length and material counts as the basis for comparing installer quotes.
- Can I use meters instead of feet?
- Yes. Switch the units to meters and enter your length, post spacing, and gate widths in metric, and the results come back consistently. A common on-center spacing is about 2.4 meters, the metric equivalent of the usual 8-foot span.
- Should I buy exactly the number of posts and rails it shows?
- Treat the results as a baseline estimate. Buy a few extra posts and rails to account for corners, end posts, slopes, cuts, and waste, and always confirm against your site layout before ordering.