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Fence calculator

Estimate the number of posts and panels for a fence of a given length.

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The Fence calculator turns Fence length (m), Post spacing (m) into Posts, Panels, instantly and for free. For instance, with Fence length (m) = 30 and Post spacing (m) = 2.5 it returns Posts = 13 and Panels = 12.

How to use it

  1. Enter your values: Fence length (m), Post spacing (m).
  2. Read the result instantly: Posts, Panels.

Frequently asked questions

How does the Fence calculator work?

It takes Fence length (m) and Post spacing (m) and derives Posts and Panels from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Fence length (m) and Post spacing (m). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Fence length (m) = 30 and Post spacing (m) = 2.5, the calculator returns Posts = 13 and Panels = 12. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Buying the right amount at the merchant: how many tiles, how much paint, how many bags of concrete, and what it all comes to.

What is the most common mistake?

Ordering the exact calculated quantity. Cuts, breakage and pattern matching mean tiles need 10% spare and more on a diagonal layout — and a second batch rarely matches the first for colour.

How accurate is it, and what are the limits?

Estimate only — confirm quantities with your supplier.

What is the difference between the Fence calculator and the Wall framing studs calculator?

This one returns Posts and Panels; the Wall framing studs calculator returns Studs needed. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Post Hole Concrete Calculator is the closest one after this: Estimate the concrete needed to set fence posts, allowing for the volume taken up by the post.

What else is worth having open alongside it?

Belt length calculator (pulleys) and Brick calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

The geometry is exact for the dimensions you enter. Coverage rates come from manufacturer datasheets and vary with the surface, the number of coats and how absorbent the substrate is.

Further reading

All guides →
How-toHow Much Fencing Do I Need? Perimeter, Posts, PanelsMeasure your run, then work out posts, panels, and rails from the perimeter and a standard post spacing so nothing is short on install day.How-toHow Much Roofing Material Do I Need? Area and SquaresTurn your building footprint into true roof area using the roof pitch, then convert to roofing squares or square meters plus a waste allowance.How-toHow Many Deck Boards Do I Need? Coverage and GapsWork out deck boards from the deck area, each board's covered width including the gap, and a waste allowance for cuts and the picture-frame border.How-toHow Much Concrete Do You Need?Concrete is measured by volume: length × width × depth. Here's how to work out cubic metres, add for waste, and choose bags or ready-mix.How-toHow Many Wall Studs Do I Need? Framing by Spacing and LengthCount the studs a wall needs from its length and stud spacing, then add for corners, openings and end studs so nothing is missing on framing day.How-toHow Many Concrete Blocks Do I Need? Blocks, Mortar and WasteWork out how many concrete blocks a wall needs from its area, add mortar and a waste allowance, and avoid a second trip to the yard.