Fence Post Calculator
Get the exact number of fence posts, panels, and concrete needed for any fencing project. Works for all panel sizes and post spacings.
Fence Post Installation Guide
Post Depth Rule of Thumb
The post hole should be at least one-third of the total post height. For a 1.8m fence, use a 2.4m post with 600mm in the ground. For exposed or windswept locations, increase to 750mm–900mm.
Postcrete vs Mixed Concrete
Postcrete (fast-setting post mix) is ideal for up to 20 posts — just pour dry into the hole, add water, and it sets in 10–20 minutes. For larger projects, mixed concrete (1:3:6 or ST1 mix) is more economical.
First and Last Posts
You always need one more post than the number of spans. A 20m fence with 1.83m panels needs 11 posts for 10 spans, plus 1 extra at the end. This calculator accounts for this automatically.
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