# Fence Calculator — Posts, Pickets, Rails & Concrete > Estimate how many fence posts, pickets, rails and concrete bags you need for any fence length. Enter post spacing and picket size for an instant material count and cost estimate. - **Category:** Construction & Home - **Interactive calculator:** https://youcalc.com/en/construction-home/fence-calculator/ - **Price:** Free, no sign-up required ## Overview This calculator estimates the number of posts, sections, pickets, rails, and concrete bags needed for a fence of any length. Use it when planning a new yard fence, replacing an existing one, or pricing materials before hiring a contractor. ## How to read your result The headline figure is the number of posts your fence requires. Below that, the summary card lists sections (the spans between posts), pickets, and rails. The horizontal bar chart visualises these four material quantities side by side — the longest bar represents the material you need most, which is almost always pickets for a standard privacy fence. ## Method Post count is derived from the Inch Calculator fence methodology: posts = ceil(length ÷ postSpacing) + 1, and sections = posts − 1. Picket count is ceil(length ÷ ((picketWidth + gap) ÷ 12)), where widths are converted from inches to feet before division. Rail count equals sections multiplied by the number of rails per section. Concrete bag count equals posts multiplied by bags per post. All formulas align with the material estimation approaches published by Inch Calculator and Hoover Fence. ## Example - **Setup:** A 100 ft fence with posts every 8 ft, 5.5 in wide pickets with a 0.5 in gap, 2 rails per section, and 2 concrete bags per post. - **Result:** 14 posts, 13 sections, 200 pickets, 26 rails, and 28 bags of concrete. ## Frequently asked questions ### Why does the post count include an extra post? A fence with n sections needs n + 1 posts — one at each end and one between every pair of adjacent sections. The calculator applies this rule automatically using the formula: posts = ceil(length ÷ post spacing) + 1. ### How is the picket count calculated? Each picket occupies its own width plus the gap between pickets. The calculator converts that combined width to feet and divides the total fence length by it, then rounds up to the nearest whole number so you never run short. ### How many rails per section should I choose? Two rails (top and bottom) suit most privacy and picket fences up to about 4 ft tall. Three rails are recommended for fences 5 ft or taller, or anywhere extra rigidity is required such as along a slope or in a high-wind area. ### What determines how many concrete bags I need per post? The standard recommendation for typical residential posts (4x4 in, set 2 ft deep) is 1–2 bags of 50 lb fast-setting concrete. Taller fences or looser soils may require 3 bags. Enter your expected bags per post and the calculator multiplies that by the total post count. ### Can I use this calculator for non-picket fence styles? Yes. For panel or rail fences where individual pickets are not applicable, set the picket width to the panel or board width and the gap to the spacing between boards. The post and rail counts remain accurate regardless of fence style. ## Related calculators - [Deck Calculator](https://youcalc.com/en/construction-home/deck-calculator/) - [Concrete Calculator](https://youcalc.com/en/construction-home/concrete-calculator/) - [Landscaping Materials Calculator](https://youcalc.com/en/construction-home/landscaping-materials-volume/) ## Sources - https://www.inchcalculator.com/fence-calculator/ - https://www.hooverfence.com/catalog/calculators --- Interactive version: https://youcalc.com/en/construction-home/fence-calculator/ · From YouCalc — https://youcalc.com