Fence Material Calculator

Enter the fence run, post spacing, height and picket size. The page returns the posts, pickets, rail metres, concrete bags and screws — enough to write a shopping list before you dig.

A fence quote is just four counts: posts, pickets, rails and concrete. Measure the run, choose the spacing and the picket size, and the page builds the list for you — including the screws.

The fence run

Measure the full run in metres, including any gate openings. Post spacing is centre to centre.

Fence length (m) Post spacing Fence height Picket width Gap between pickets Rails per span

Fence posts –

Pickets –

Rail metres –

Picket metres –

Concrete bags (25 kg) –

Screws –

How this was worked out

–

Fence runs at a glance

Fence run	Pickets	Rail metres	Posts
10 m	84	30 m	6
20 m	167	60 m	11
30 m	250	90 m	16
50 m	417	150 m	26

Four rules for the order

Posts set 1.8–2.0 m apart. Wider spacing saves posts but lets the rails sag under wind load.
Set posts at least one-third of their length in the ground; 60 cm is the usual minimum for a 1.5 m fence.
One 25 kg bag of fast-setting concrete per post is enough for a 10 cm post in normal soil. Add a second bag in sandy or windy ground.
Order 10% extra pickets for cuts and defects, and keep one rail spare for the gate frame.

Practical notes

Deduct gate openings from the run and build the gate as a separate frame; a gate is not just a gap in the pickets.
Run a string line at the top of the posts before fixing rails. It is the cheapest way to catch a leaning post.
Stainless or coated screws last far longer than plain steel; two per picket per rail is the standard fixing.

Three common mistakes

Counting posts as length ÷ spacing. A 20 m run at 2 m spacing needs 11 posts, not 10, because both ends need one.
Forgetting the gap when counting pickets. A 10 cm picket with a 2 cm gap covers 12 cm, not 10 cm.
Buying rails by the piece without checking the span. A rail sold at 2.4 m cannot span a 2.4 m post spacing once the ends overlap.