How to Calculate Fence Materials
The key formula for fence posts: Posts = (Total Length ÷ Post Spacing) + 1. Each section between two posts needs one panel, and each post needs 2 bags of concrete (50 lb) for a stable installation.
Important: Posts at corners and gate openings require extra posts. Our calculator automatically adds 2 extra posts per gate. Always add 10% extra materials for waste and mistakes.
Post Depth Guide
A fence post should be buried at least 1/3 of its total length underground. For a 6-foot fence, use 9-foot posts and bury 3 feet. For a 4-foot fence, use 6-foot posts and bury 2 feet. In frost-prone areas, posts must be buried below the frost line (usually 36–48 inches deep).
- 4 ft fence: Use 6 ft posts, bury 2 ft deep
- 6 ft fence: Use 9 ft posts, bury 3 ft deep
- 8 ft fence: Use 12 ft posts, bury 4 ft deep
Pro tip: Use fast-setting concrete (like Quikrete Fast-Setting) — just pour it dry into the hole, add water, and it sets in 20–40 minutes. No mixing required.