🪵 Fence Calculator

Posts = Floor(Fence Length / Post Spacing) + 1 (Always add 1 for the end post) Gates reduce post count by 1 per gate opening Rails = Posts × Number of Rails per Bay Pickets per Bay = Bay Width / (Picket Width + Gap) Total Pickets = Pickets per Bay × (Posts − 1) Example: 40m fence, 2.4m spacing, 90mm picket, 10mm gap Posts = Floor(40/2.4) + 1 = 17 + 1 = 18 posts Rails = (18−1) × 2 = 34 rails at 2.4m each Bay width = 2.4m = 2400mm Pickets per bay = 2400 / (90+10) = 24 pickets Total pickets = 24 × 17 = 408 pickets

Rolls Needed = Ceil(Fence Length / Roll Length) Line Posts = Floor(Fence Length / Spacing) − 1 Terminal Posts = 2 + (2 × number of corners) (Terminal posts at ends, corners and gates are heavier) Total Posts = Line Posts + Terminal Posts Example: 40m fence, 15m rolls, 2.4m spacing Rolls = Ceil(40/15) = 3 rolls Line posts = Floor(40/2.4) − 1 = 15 posts Terminal posts = 2 ends + corners as needed

Hole volume = π × (Hole Diameter/2)² × Burial Depth Hole diameter ≈ 3 × Post diameter Burial depth = 1/3 to 1/2 of above-ground height Minimum: 0.6m for most fences For a 1.8m fence: bury at least 0.6m For a 2.4m fence: bury at least 0.75–0.9m Standard rule: 1 bag (50kg) per post for light fences; 2 bags for heavy/tall fences.