Fence Posts Calculator
Posts, panels, the exact spacing that results and the concrete needed to set them.
Results
Posts needed
11
Panels or sections
10
Length
2.400
m
Volume
0.324
m³
What this tool does
A fence always needs one more post than it has panels, which is the detail most often forgotten when ordering. The spacing shown is the exact even spacing after rounding up the number of bays, and the concrete figure assumes a cylindrical hole per post.
Formula
spans = ⌈length ÷ spacing⌉ , posts = spans + 1
Variables
| Symbol | Meaning | Unit |
|---|---|---|
l | Length | m |
s | Spacing between posts | m |
d | Depth | cm |
pd | Diameter | cm |
P | Posts needed | — |
B | Panels or sections | — |
S | Length | m |
C | Volume | m³ |
Worked example
- Length24 m
- Spacing between posts2.4 m
- Depth60 cm
- Diameter25 cm
- Posts needed11
- Panels or sections10
- Length2.400 m
- Volume0.324 m³
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- Always order a little more material than the calculated quantity. Cuts, breakage and pattern matching create waste that depends on the shape of the job.