Calculate fence materials, posts, and pickets
A fence calculator estimates posts, rails, pickets, and materials for wood, vinyl, or metal fencing. Accurate calculations ensure consistent spacing and professional results.
Posts = (Perimeter / Post Spacing) + 1; Rails = Posts × Rails Per Section
6-8 feet: Standard for most wood fences. 6 feet: Better for tall fences or windy areas. 8 feet: Common for vinyl and metal panels. Never exceed 8 feet for structural integrity.
General rule: 1/3 of total post length underground. 6' fence = 8' post with 2' buried. In cold climates, go below the frost line (typically 36-48"). Use 9-10' posts for 6' privacy fence.
One 50 lb bag per post for 4×4 posts. Two bags for 6×6 posts. Fast-setting concrete is convenient for DIY. Use post mix that doesn't require mixing for quickest install.
Calculate: Fence length (inches) / (picket width + gap). Standard 6" picket with 1/4" gap: About 18 pickets per 10 feet of fence. Buy 10% extra for defects and cuts.
4-foot fence: 2 rails. 6-foot fence: 2-3 rails. 8-foot fence: 3 rails. Rails should be 2×4 for most fences, 2×6 for heavy fences. Top rail prevents warping.
Pre-made panels: Faster, more consistent, limited customization. Build on-site: Adapts to slope, custom spacing, more labor. Panels work for level ground; build on-site for slopes.