Fence Post, Rail & Picket Calculator
Professional wood privacy and shadowbox fence takeoff engine. Computes structural post spans (6ft and 8ft O.C.), below-grade concrete footings, horizontal 2x4 rails, dog-ear pickets, and gate framing.
Fence Post, Rail & Picket Takeoff
Fence Layout & Post Specs
Client-side reactive engine. Adjust run length, post centers, and heights for instant BOM.
Fence Takeoff Schedule
| Component | Quantity | Unit | Est. Cost |
|---|---|---|---|
| 4"×4" Posts (8') | 15 | posts | $214 |
| Fast-Setting Concrete | 30 | bags (50 lb) | $206 |
| 2"×4" Rails (8') | 41 | rails | $314 |
| Dog-Ear Pickets (1"×6") | 230 | pickets | $679 |
| Exterior Fasteners | 5 | boxes (5 lb) | $160 |
| Gate Hardware Kits | 1 | kits | $42 |
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Material Takeoff & Accessory Checklist
Click any unit price to customize for your local supplier costs.
| Item / Specification | Category | Quantity | Unit Price | Total Est. | Supplier / Order |
|---|---|---|---|---|---|
4" x 4" x 8' Pressure-Treated Wood Posts Severe Weather Ground Contact posts (spaced 8' on-center) | primary | 15 posts | $214 | Home Depot | |
Fast-Setting Concrete Mix (50 lb Bag) Sets in 20-40 minutes without prior premixing (2 bags per post footing) | primary | 30 bags (50 lb) | $206 | Home Depot | |
2" x 4" x 8' Ground Contact Horizontal Rails 3 rails per section spanning post-to-post + gate framing | primary | 41 rails (8') | $314 | Local Supplier | |
1" x 6" x 6' Dog-Ear Fence Pickets Pressure-treated wood pickets, includes 5% cutting waste | primary | 230 pickets | $679 | Home Depot | |
1-5/8" Coated Exterior Star-Drive Wood Screws (5 lb Box) ACQ approved exterior screws for secure picket fastening without splitting | fastener | 4 box (5 lb) | $126 | Local Supplier | |
3" Exterior Heavy-Duty Structural Screws (5 lb Box) Fastens 2x4 rails securely to 4x4 posts with extreme shear resistance | fastener | 1 box (5 lb) | $34 | Local Supplier | |
Heavy-Duty Self-Closing Gate Hardware Kit Includes commercial T-hinges, gravity latch, handle, and anti-sag turnbuckle cable | accessory | 1 kits | $42 | Local Supplier |
Calculation Mechanics: Fence Post Spacing & Lumber Takeoff
Formulas adhere to ASTM standards, ACI 318 guidelines, and standard construction estimating practice.
Step-by-Step Derivation Breakdown:
- 1Compute structural post sections: 100 ft ÷ 8 ft spacing = 13 sections.
- 2Calculate total line, terminal & gate posts: 13 + 1 end post + 1 gate transitions = 15 posts.
- 3Calculate concrete footings: 2 bags (50-lb) per post hole = 30 bags (for 24"-30" frost depth).
- 4Calculate horizontal 2x4 rails: 13 sections × 3 rails + 2 gate frame rails = 41 rails (8 ft length).
- 5Calculate picket count: (100 ft × 12 in) ÷ 5.5 in effective width × 1.05 waste = 230 pickets.
Field Inspection & Trade Best Practices
- Post hole depth should equal 1/3 of the total post length (typically 24 to 30 inches deep in non-freezing zones, or below the local frost depth in northern climates).
- Always add 2-3 inches of crushed stone or gravel at the bottom of each post hole before pouring concrete to allow water drainage away from the wood end grain.
- Use hot-dipped galvanized or exterior-coated polymer screws rather than smooth framing nails to prevent unsightly black tannin bleed and fastener pullout over time.
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Popular Fence Runs & Material Takeoffs
27 Verified PresetsFencing Construction FAQs & Best Practices
How do I calculate how many posts I need for a fence?
Divide your total fence length in feet by your post spacing (standard 8 ft on-center, or 6 ft for high winds). Round up to the nearest whole section, add 1 for the terminal end post, and add extra posts for each gate opening.
How deep should fence post holes be dug?
Fence post holes should be dug to at least 1/3 of the total post height (typically 24 to 30 inches deep for a 6-foot fence). In cold regions, holes must extend 6 inches below the local winter frost line to prevent frost heave.
How many bags of concrete do I need per fence post?
A standard 10-inch to 12-inch diameter hole for a 4x4 post requires two 50-lb bags (or 1.5 eighty-pound bags) of fast-setting concrete mix.
How many pickets do I need for a 6-foot privacy fence?
Convert fence run length to inches (length × 12) and divide by the picket width (5.5 inches for standard 1x6 dog-ear boards). Add 5% to 10% safety margin for warped or split lumber.