Fencing · Project planning

Fence Post Calculator

Count physical posts across detached runs, connected corners, straight continuations and a closed perimeter. Choose a maximum spacing and see the equal spacing actually produced.

By Alish Gautam, Software Developer · Updated · Calculation methodology

Start with the editable example below. Dimensions retain their physical size when units change. Region sets currency labels without converting currencies; confirm entered quotes after changing region.

Fence layout

Run length includes gate openings. Gate offset is measured from the run start. Corner and straight connections share the preceding end post.

Run 1
Basic settings
Editable wood-fence planning example. Use project or manufacturer limits.
Advanced settings
Advanced planning settings
Connect the last run back to the first. All runs must form one connected perimeter.

Project takeoff

Whole packages round up. Allowance is separate from purchased surplus. Prices omit labor, delivery, tax and other items unless explicitly entered.

Total measured fence run
100 ft
Gate openings
0 ft
Net infill length
100 ft
Maximum bay spacing
8 ft
Infill bays
13
Physical posts
14

Supplier-ready material list

line posts
12
end posts
2
corner posts
0
gate posts
0
Geometry / layout breakdown
Dimensions use the selected measurement system.
RunInfill (ft)BaysEqual spacing (ft)
Run 1100137.692
Infill span sketch. Shared supports appear in both spans; the physical post total above counts each once. Gate openings are omitted from infill.
Infill span elevationsSpan 1: Run 1 · 13 bays

The result is a quantity calculation, not a post-spacing or structural specification. Gates at a boundary use the existing terminal node.

How it works

bays = ceil(span / spacing); intermediate posts = bays − 1. Graph nodes deduplicate connected endpoints and classify line, end, corner and gate posts.

Assumptions and limitations

The result is a quantity calculation, not a post-spacing or structural specification. Gates at a boundary use the existing terminal node.

Whole packages round upward after the chosen allowance. Physical geometry and purchase reserve are separate. Manufacturer and project specifications override editable examples; the selected region does not establish a local code requirement.

Sources and boundaries

QUIKRETE: Setting Posts without Mixing

Open the source · Web guidance; edition not stated · Reference checked 2026-10-04

Scope: Manufacturer general post-setting instructions

Used for: One-third to one-half above-ground-height planning reference.

Does not establish: Local frost depth; Wind design; Universal minimum embedment.

Planning guidance must be checked against soil, loads and project requirements.