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Slats Calculator - Even Spacing Calculator for Decking & Fencing
Calculate perfect spacing for slats, decking, fencing, and slatted projects. Free calculator for even distribution, gap sizing, and material planning. Get optimal spacing for any project width.
Last updated: 1/26/2025
Project Type
Calculation Method
Total Width
Slat Width
End Margin
Number of Slats
Cutting List (Optional)
Layout Results
Detailed Measurements:
0"
0"
0"
0"
Calculation Method:
Available Space: Total Width - (2 × End Margin)
Gap Size: (Available Space - Total Slat Width) ÷ (Number of Slats - 1)
Slat Spacing Guide
Proper slat spacing combines function, aesthetics, and building codes. Our calculator ensures even distribution for professional results.
Function First
Consider the purpose: deck drainage needs gaps, privacy fencing needs minimal gaps, and decorative panels can use larger gaps for visual effect.
Visual Balance
Even spacing creates a professional appearance. Avoid partial slats at ends when possible, or center the layout to balance any partial pieces symmetrically.
Practical Installation
Plan for expansion, seasonal movement, and installation tolerances. Leave adequate end margins and consider how materials will behave over time.
Application Guidelines
Typical Gap Sizes:
- • Deck Boards: 1/4" to 3/8"
- • Fence Pickets: 0" to 1"
- • Privacy Fence: 0" (no gaps)
- • Slatted Panels: 1" to 3"
- • Garden Screens: 2" to 4"
Planning Considerations:
- • Building codes and regulations
- • Material expansion and contraction
- • Drainage and air circulation needs
- • Privacy and security requirements
- • Maintenance access and cleaning
Use our calculator to test different configurations and find the optimal balance of function, appearance, and material efficiency for your project.
Common Slat Applications
Deck Construction
Deck boards need precise spacing for drainage and expansion. Calculate even gaps to prevent water pooling and ensure professional appearance.
Fence & Privacy Screens
Fence pickets require consistent spacing for appearance and function. Balance privacy needs with material efficiency and local code requirements.
Slatted Furniture
Outdoor furniture benefits from calculated slat spacing for comfort and drainage. Even gaps ensure professional-looking benches, tables, and chairs.
Garden Structures
Pergolas, arbors, and garden screens use calculated spacing for optimal shade patterns and plant support while maintaining structural integrity.
Interior Panels
Room dividers, ceiling treatments, and decorative panels benefit from precise slat calculations for visual appeal and acoustic properties.
Storage & Shelving
Slatted shelving and storage solutions require calculated spacing for proper support and ventilation while maximizing usable space.
Frequently Asked Questions
How do you calculate even spacing for slats?
For even spacing, subtract the total slat width and end margins from the total project width to get available gap space. Then divide by the number of gaps (slats - 1) to get individual gap size. Our calculator handles this automatically for perfect distribution.
What's the difference between specifying number of slats vs gap size?
Specifying number of slats lets you control exactly how many pieces you need, while specifying gap size ensures consistent spacing appearance. Our calculator works both ways - input what you know and it calculates the rest.
Should I include end margins in slat calculations?
Yes, end margins create a professional finished appearance and allow for expansion. Typical end margins range from 0.5" to 2" depending on the project. Decking and fencing usually benefit from consistent end margins.
How do I handle partial slats in my layout?
If calculations result in a partial slat, you can either adjust the gap size slightly or plan to cut the end slats. Our calculator shows both the ideal calculation and practical considerations for real-world installation.
What gap sizes work best for different applications?
Deck boards: 1/4" to 3/8" for drainage, Fence pickets: 0" to 1" for privacy, Slatted panels: varies by design preference. Consider function, aesthetics, and local building codes when choosing gap sizes.
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