Wood Fence Calculator

Estimating fencing materials relies on basic geometry and spacing rules. First, the number of posts is determined by dividing the total fence length by the chosen post spacing and adding one for the terminal post: Number of Posts = ceil(Length / Spacing + 1). Sections equal the number of posts minus one, which dictates how many rails you need. Picket counts factor in both board width and the gap between them: Number of Pickets = ceil(Length / (Width + Spacing)). Finally, post length is typically calculated as one-and-a-half times the fence height to ensure proper underground anchoring, which in turn determines the exact volume of concrete needed for hole stabilization.

Imagine you want to build a wood fence that is 30 feet long with a fence height of 6 feet. You decide on a post spacing of 8 feet. First, calculate your posts: 30 / 8 + 1 equals 4.75, which rounds up to 5 posts. Next, determine your sections: 5 posts give you 4 sections. If your design calls for 3 rails per section, you will need 4 sections * 3 rails = 12 rails total. For pickets, assuming a 5.5-inch width with a 0.5-inch gap (total 6 inches or 0.5 feet per picket interval), a 30-foot span requires 30 / 0.5 = 60 pickets. Finally, your post length must be 6 feet * 1.5 = 9 feet deep, ensuring deep, secure concrete footings.

Always check local property lines and zoning laws before digging or purchasing materials. Order an extra 10% in pickets and fasteners to account for split boards, measuring mistakes, or future repairs. When mixing concrete for your posts, aim for a peanut-butter consistency and let it cure for at least 48 hours before attaching any heavy rails or pickets.