Fence Calculator
Enter the length of the fence line, the post spacing and the gates.
This result is an estimate only. Double-check important figures before relying on them.
How it is calculated
- Length for panels = total length − gates × gate width
- Panels = length for panels ÷ spacing, rounded up
- Posts = panels + 1 + one extra for each gate
For materials on a wall, use the brick calculator.
Worked example
20 m of fence with one 1.2 m gate and 2.4 m panels:
- Length for panels = 18.8 m, so 8 panels
- Posts = 8 + 1 + 1 = 10
Why your number may differ
Corners, uneven ground and end posts may need extra posts. Include gate hardware, concrete and rails in your list.
Frequently asked questions
How many fence posts do I need?
One more post than the number of panels or spans. Each gate needs its own extra post.
How do I allow for a gate?
Take the gate width off the total length, then divide what is left by the panel width.
How far apart should posts be?
Match the width of your panels, or about 1.8 to 2.4 m for rail fencing. Follow the manufacturer’s guide.