Picket Fence Calculator — Fast Planning Estimates
This free picket fence calculator makes it easy to estimate pickets, posts, rails, and paint/stain coverage. Choose single‑sided for a traditional look, or double‑sided (shadowbox) for better privacy and airflow. Enter your fence length, height, picket width, and desired gap—then add post spacing and rails per section. The calculator instantly returns counts and lengths for a tidy materials list. Optionally, add prices for a quick cost estimate.
How to Use This Picket Fence Calculator
- Enter fence length and height.
- Set picket width and a gap (0 in for privacy, 1–3 in for decorative).
- Pick post spacing (6–8 ft is common) and rails per section (2 for ≤6 ft fences, 3 for taller).
- Choose Single‑sided or Double‑sided (shadowbox). Adjust the overlap factor as needed.
- Add a waste allowance (5–15%). Click Calculate.
Choosing Picket Spacing
Tighter gaps improve privacy and wind resistance, while wider gaps reduce material, cost, and wind load. Decorative picket fences often use 1–3 in gaps. For shadowbox fences, our overlap factor (1.5–2.0) helps you tune the look—higher factors increase privacy.
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Frequently Asked Questions
How many pickets for 100 ft of fence?
Divide 100 ft × 12 by (picket width + gap) and round up; then add your waste. Example: 3.5" pickets with 2" gap → 1200 ÷ 5.5 ≈ 219 pickets (≈241 with 10% waste).
How many posts for a 50 ft fence?
With 8 ft spacing: ceil(50/8) + 1 = 8 posts.
2 or 3 rails?
Two rails are standard up to ~6 ft; use three rails for taller fences or where pickets tend to cup/warp.
Do I need to seal the end grain?
Yes—end grain absorbs moisture quickly. Seal cuts to extend life and finish quality.
Disclaimer: Planning estimates only. Follow local building codes and manufacturer recommendations.
Important Estimate Disclaimer
The results provided by this calculator are intended as general estimates only and should not be considered precise engineering measurements. Actual material requirements, costs, and quantities can vary significantly based on site conditions, local building codes, soil type, reinforcement requirements, climate exposure, and the intended use of your project.
These calculators are designed to help you plan and budget your project more effectively, but they do not replace professional advice from a qualified contractor, engineer, or building inspector. Always verify your calculations and assumptions with trained professionals before placing material orders or commencing construction.
For more information on the assumptions, formulas, and data used in these tools, see our Data Sources and Methodology pages.
Material estimates, cost figures, and volume calculations are approximate and may not reflect your actual requirements. Always double-check dimensions and project-specific needs, and consider adding a contingency allowance for waste, over-excavation, and unforeseen conditions.
If you are unsure about any aspect of your project — including structural requirements, reinforcement needs, drainage, or load-bearing capacity — consult with a licensed professional before proceeding.