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Tool: Fence Calculator — Posts, Rails, Pickets & Concrete | Printed on:
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Fence Calculator — Posts, Rails, Pickets & Concrete
Calculate line posts, horizontal rails, pickets, gate kits, and posthole concrete bags.
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CONSTRUCTION & CODE
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Project Specifications
Fence Posts & Pickets Formulas
Transparent mathematical methodology explained in plain English.
Posts = (Fence Run / Post Spacing) + 1 + Gates | Pickets = Run / Picket Width Dividing total fence run by post spacing yields the post count. Horizontal rails multiply sections by 2 or 3.
Variables Explained:
- Concrete: 2 bags of 50-lb fast-setting concrete per post.
Real Project Example
150 ft Privacy Fence (6 ft High with 1 Walk Gate)
Standard residential wood privacy fence calculation.
Sample Project Inputs:
Total Length: 150 ft
Gate: One 4-ft gate
Post Spacing: 8 ft
Pickets: 1×6 (5.5" wide)
Step-by-Step Calculation:
- Actual fence run: 150 - 4 = 146 ft.
- Sections: 146 ÷ 8 = 18.25 -> 19 sections.
- Posts: 19 + 1 + 1 extra gate post = 21 posts (4×4×8ft).
- Rails (3 per section for 6ft fence): 19 × 3 = 57 2×4 rails.
- Pickets: 146 ft ÷ (5.5/12) = 319 pickets + 5% waste = 335 pickets.
- Concrete: 21 posts × 2 bags = 42 bags of fast-setting concrete.
Calculated Answer: Order 21 posts, 57 rails, 335 pickets, and 42 bags of concrete.
Knowledge Base
Frequently Asked Questions: Fence Calculator
Click any question below to expand quick answers, formulas, and expert tips.
How deep should fence posts be set in the ground?
Posts should be buried to a depth equal to 1/3 to 1/2 of their above-ground height. For a 6-foot fence, dig postholes at least 24 to 30 inches deep.