Fence Calculator

Fence Calculator works out the panels, posts, gravel boards and post-mix a run of fencing needs. The arithmetic looks trivial and has one trap in it: a run needs one more post than it has panels, because both ends need one.

Gates add another post each, since a gate needs its own hanging post rather than sharing one with a panel. Between them, those two rules are why a thirty-metre fence with one gate needs eighteen posts for sixteen panels, and why ordering posts to match the panel count stops the job with everything else already on site.

The last panel almost never lands exactly, and its cut width is shown so you know before you start. Post-mix is estimated from the hole volume at roughly 0.01 cubic metres per 20 kg bag; holes a quarter of the post length deep is the usual rule, which is 60 cm for a 1.8 metre fence.

The page shows its working, not just its answer. Where there is a formula it is printed with your own numbers substituted in, so you can check the result rather than take it on trust -- which is the difference between a calculator you can use for something that matters and one you cannot.

Everything runs inside your browser. What you type is never uploaded, never logged and never stored, and the calculator keeps working if your connection drops after the page has loaded.

• Shows panels, posts, gravel boards, post-mix bags and materials cost together, so you are not running it twice
• A results table you can read across
• Updates as you type, with no button to press and no page reload
• Copy the result in one click
• Free, no sign-up, and it runs entirely in your browser

The fence calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

• Ordering panels and posts for a garden fence
• Working out post-mix for the post holes
• Allowing for gates in the run
• Finding the cut width of the last panel