Fence Materials Calculator
Calculates the number of fence posts, panels, and hardware required for a residential fencing project. Use it before purchasing materials to get an accurate count accounting for gates.
About this calculator
The foundation of any fence materials estimate is the post count. Posts are placed at every panel junction plus one terminal post at the end of each run. The formula is: posts = ceil((fence_length − (gate_count × gate_width)) ÷ post_spacing) + 1. Subtracting total gate width removes the spans that don't need posts in the standard pattern (gates have their own dedicated posts). Dividing by post_spacing gives the number of fence sections, and adding 1 accounts for the final end post. Panel count equals the number of sections (posts − 1 minus gate openings). Hardware quantities — such as post caps, rail brackets, and screws — are then derived from post and panel counts. Accurate post spacing (typically 6–8 ft for wood, 8 ft for vinyl) is critical because exceeding manufacturer limits causes panels to sag or rack over time.
How to use
A homeowner wants a 120 ft wood fence with 8 ft post spacing, 1 gate that is 4 ft wide. Step 1 — net fence length: 120 − (1 × 4) = 116 ft. Step 2 — post count: ceil(116 ÷ 8) + 1 = ceil(14.5) + 1 = 15 + 1 = 16 line posts. Step 3 — add 2 gate posts (one each side of gate): total posts = 18. Step 4 — panels: 15 sections of fencing plus 1 gate panel = 16 panels total. This gives a shopping list before visiting the lumber yard.
Frequently asked questions
How far apart should fence posts be spaced for a wood privacy fence?
Standard post spacing for wood privacy fences is 6 to 8 feet on center, with 8 feet being the most common because fence panels and picket boards are typically sold in 8-foot lengths. Shorter 6-foot spacing is recommended for taller fences (6–8 ft) or areas with high wind exposure, as it reduces flex and sag over time. Always check the panel or board manufacturer's maximum span recommendation. Corner and gate posts should always be set closer together regardless of standard spacing to handle the extra stress at those points.
How deep should fence posts be set in the ground for a 6-foot fence?
A common rule of thumb is to bury one-third of the total post length, so a 6-foot fence requires 9-foot posts set 3 feet deep. In frost-prone climates, posts must be set below the frost line (typically 36–48 inches in northern U.S. regions) to prevent heaving. Setting posts in concrete footings 10–12 inches in diameter adds stability, especially for gate and corner posts that bear extra lateral load. Under-setting posts is the leading cause of fence leaning and failure within a few years.
What materials do I need to build a standard wood privacy fence per linear foot?
For every 8-foot section of a 6-foot wood privacy fence you typically need: 2 line posts (4×4×9 ft), 2 horizontal rails (2×4×8 ft), and 11–12 dog-ear pickets (1×6×6 ft) depending on picket spacing. Per linear foot that works out to roughly 1.5 pickets, 0.25 rails, and 0.25 posts. Hardware includes post caps, rail brackets or joist hangers, and approximately 1 lb of exterior screws or galvanized nails per 8-foot section. Adding 10% extra pickets accounts for cuts, knots, and waste.