What this estimate includes
This estimate shows posts, rails, pickets or panels, concrete bags, and gates for a basic fence run.
Before you order
Corners, slopes, gates, post depth, soil conditions, and local code can change the final quantity. Use this as a planning estimate and confirm with your fence supplier or installer.
Frequently Asked Questions
How many posts do I need for 100 feet of fence?
With 8-foot post spacing, a 100 ft fence needs 13 line posts plus 2 end posts = 15 posts total (before gate posts). With 6-foot spacing, that rises to 17 line posts plus 2 end posts = 19 posts. Gate posts are extra.
How far apart should fence posts be?
Standard residential fence posts are spaced 6 or 8 feet apart center-to-center. Six feet is more common for privacy fences -- it provides better panel support. Eight feet works for agricultural fencing and some ranch styles.
How many panels do I need for a fence?
Divide total fence length by panel width. For 100 feet of fence with 8-foot panels, you need 13 panels (round up). For 6-foot panels, 17 panels. Always round up -- partial sections still need a full panel.
How many pickets do I need for a wood fence?
Divide the fence length in inches by (picket width + gap width). For 100 ft of fence with 3.5-inch pickets and 0.5-inch gaps, that is 1,200 / 4 = 300 pickets. Add 10% for waste and off-cuts.
How many rails does a fence need?
A 6-foot privacy fence typically uses 3 horizontal rails per section (top, middle, bottom). A 4-foot fence typically uses 2 rails. Rails run the full length of each section between posts.
How much concrete do I need for fence posts?
A standard 6-inch hole at 24 inches deep takes about 1 bag of 80 lb concrete. Use the post hole concrete calculator for exact quantities based on your hole size and depth.
Should I add extra materials for waste?
Yes -- always add 5-10% for a straight fence, and 10-15% for fences with gates, corners, slopes, or irregular shapes. Picket cuts and panel trims at ends generate waste that is not reusable.
Disclaimer: This calculator provides estimates only. Actual material needs depend on fence line shape, slope, soil conditions, local code, and supplier specifications. Always verify quantities with your lumber yard and check local permit requirements before installation. See all
outdoor calculators.