Fence Calculator

The calculations rely on fundamental geometric and spatial formulas to break down your property line into manageable segments. First, the number of posts is determined by dividing the total fence length by your chosen post spacing and adding one for the final terminal post: Posts = ceil(Length / Spacing) + 1. The number of fence sections equals the total length divided by spacing. Pickets are estimated by accounting for both the slat width and the gap spacing: Pickets = ceil(Length / [Picket Width + Picket Spacing]). Finally, structural integrity demands that post holes be deep; standard practice calculates post length as 1.5 times the fence height, which subsequently dictates the volume of concrete required for secure footings.

Imagine you want to install a wooden barrier that is 15 meters long, with a target fence height of 2 meters. You select a standard post spacing of 2.0 meters, use 10 cm wide pickets with a 5 cm gap, and include 2 rails per section. First, calculate the posts: ceil(15 / 2.0) + 1 = 9 posts. Next, compute the sections: ceil(15 / 2.0) = 8 sections. For rails, multiply the sections by rails per section: 8 * 2 = 16 rails. For pickets, use the combined width and spacing (0.10 + 0.05 = 0.15m): ceil(15 / 0.15) = 100 pickets. Post length is set to 2 meters * 1.5 = 3 meters deep, allowing you to accurately compute your total concrete requirements for the 9 post holes.

Always purchase an extra 10% to 15% of materials such as pickets and screws to account for cutting errors, split wood, or warped boards. Check local zoning laws and call your utility provider to mark underground lines before digging any post holes. Ensure your concrete footings extend below the local frost line to prevent seasonal heave from pushing your fence posts out of alignment.