Fence Post Calculator
Calculate posts, panels, and concrete for any fence run. Enter your total length and panel size to get exact quantities with concrete needed for setting.
Fence Installation Guide
Post Depth Rule
For fences up to 1.5m: minimum post depth of 450–600mm. For 1.8m fences: 600mm minimum, 750mm on exposed or windy sites. Rule of thumb: post depth = 1/3 of total post length. A 2.4m post (giving 1.8m above ground) needs 600mm buried.
Concrete Quantities
Each post hole typically needs a mix 300mm in diameter, 600mm deep = approximately 0.042 m³ = about 1.5 bags of 25kg postcrete. Postcrete is a rapid-set product that sets around the post in minutes when water is added.
Metal vs Timber Posts
Galvanised steel post spikes avoid concrete and can be quicker to install on firm ground. Metal posts last significantly longer than timber. For fence panels, steel H-frame posts designed for your panel size are the most secure and best-looking option.
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