Fence Materials Calculator
Estimate how many posts, panels, pickets, and concrete bags you need to build your privacy or picket fence.
On this page
Fence Linear Measurement
Measure the total linear length of your property line. Our calculator determines how many pre-built panels, individual pickets, posts, and concrete bags you need.
How to Use the Fence Calculator
Whether you are installing pre-fabricated 8x6 panels or building a custom fence picket-by-picket, calculating your materials perfectly ensures you don't run out of concrete while mixing.
- Measure the property line: Enter the total linear length of the area you are fencing in.
- Count your gates: Add the number of pedestrian or driveway gates you plan to install. Each gate adds additional heavy-duty posts to your material list.
- Select gate width: Gate openings are subtracted from panel and picket infill length.
- Select your spacing: Standard wood fences use 8-foot post spacing. Vinyl fences often use 6-foot spacing.
Fence Calculation Formula
We calculate fence materials by finding the number of segments (panels) and then adding an extra post to cap off the final segment.
Step 1: Calculate Infill and Panels
Infill Length = Total Length − (Number of Gates × Gate Width)
Number of Panels = Infill Length ÷ Post Spacing, rounded up
Step 2: Calculate Posts
Number of Posts = Panels + 1 + (Number of Gates)
Step 3: Calculate Concrete
Concrete Bags = Total Posts × 1.5
Fence Example Calculation
You are fencing your backyard with a 150-foot run, using standard 8-foot spacing and one 4-foot gate.
- Infill: 150 − 4 = 146 feet after the gate opening.
- Panels: 146 ÷ 8 = 18.25 (round up to 19 panels).
- Base Posts: 19 panels + 1 end post = 20 posts.
- Gate Posts: 20 + 1 gate post = 21 total posts.
- Concrete Bags: 21 posts × 1.5 bags = 31.5 (Buy 32 bags).
- Related material: If you need other materials for this project, check out our Concrete Calculator.
Conclusion: You need 19 panels, 21 posts, and 32 bags of concrete.
Tips for Building a Fence
- Use fast-setting concrete: Buy the concrete bags labeled "Fast-Setting" (often with a red label). You do not need to pre-mix this in a wheelbarrow. Simply pour the dry powder directly into the hole around the post, and then pour a gallon of water on top. It sets in 20 minutes.
- Keep wood off the ground: Wood naturally rots when exposed to soil moisture. Always leave a 1 to 2-inch gap between the bottom of your pickets and the soil. Your posts should be rated for "Ground Contact" pressure treatment.
- Call before you dig: Always call 811 (in the US) a few days before you dig your post holes. Utility companies will come out for free and spray paint the ground to show you where dangerous gas and electric lines are buried.
Transparent estimate
Accuracy, assumptions, and sources
Reviewed September 29, 2026
Estimates panels, posts, pickets, and concrete while subtracting gate openings from the fence infill length.
What this estimate assumes
- Post spacing and fence height remain feet-based product choices in both display modes.
- Each gate adds one planning post beyond an uninterrupted run.
What it cannot know
- Corners, slopes, end conditions, gate hardware, wind loads, frost depth, and local post-hole requirements need site review.
Reference links
Found a questionable result? Report the inputs and result so the calculation can be rechecked.
Frequently Asked Questions
How deep should fence posts be buried?
Post depth depends on fence height, wind exposure, soil, frost depth, post type, and local requirements. Use the project specification or local guidance rather than a universal ratio.
How many bags of concrete per fence post?
For a standard 6-foot fence with an 8-inch diameter post hole dug 2 feet deep, you will need approximately one and a half to two 50-lb bags of fast-setting concrete per hole.
How many pickets are in an 8-foot fence panel?
If you are building your own fence using standard 5.5-inch wide dog-ear pickets with no gaps (a full privacy fence), you will need roughly 18 pickets to cover an 8-foot section.
Why do gates require extra posts?
A gate acts like a heavy lever that constantly pulls on the post it is hinged to. You must add an additional 'gate post' to frame the opening, and these posts should ideally be set deeper with more concrete to prevent sagging over time.