Trex Calculator - Deck Calculator & Composite Decking Calculator
Free Trex calculator & deck calculator. Calculate Trex materials, costs, and installation requirements. Our calculator uses decking industry standards to determine accurate measurements and cost estimates for composite decking projects.
Last updated: October 19, 2025
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Deck Area
240 sq ft
Boards Needed
2
Total Boards
3
Waste Boards
1
Recommendation
Medium deck project. Professional installation recommended for best results.
Trex Calculator Types & Features
Boards needed
Length ÷ Spacing
Calculate exact number of Trex boards required for your deck
Cost per board
$40 - $70
Estimate total project costs including materials and labor
Waste factor
10% - 15%
Account for cutting waste and installation requirements
Installation cost
$8 - $12/sq ft
Estimate professional installation costs for Trex decking
Trex lines
Select, Enhance, Transcend
Choose the right Trex product for your budget and needs
Maintenance
Minimal Required
Calculate long-term savings compared to wood decking
Quick Example Result
For a 20' × 12' deck with Trex Enhance:
Total Boards
17
Total Cost
$2,920
How Our Trex Calculator Works
Our Trex calculator uses decking industry standards and composite material specifications to determine accurate material requirements and cost estimates. The calculation applies decking industry standards to ensure precise measurements and cost estimates for Trex composite decking projects.
Trex Calculation Formulas
Deck Area = Length × WidthBoards Needed = Length ÷ Joist SpacingTotal Boards = Boards × (1 + Waste Factor)Material Cost = Total Boards × Cost per BoardThese formulas ensure accurate Trex calculations for material requirements and costs. The calculations follow standard decking industry practices and Trex specifications.
Shows deck layout, joist spacing, and board calculations
Decking Industry Standards
Trex calculations are based on decking industry standards and composite material specifications. These standards ensure proper installation and material usage for composite decking projects. Professional deck builders use these calculations for accurate material ordering and cost estimation.
- Joist spacing: 16 inches on center (standard), 24 inches (some products)
- Waste factor: 10-15% depending on deck complexity
- Installation costs: $8-12 per square foot for professional work
- Material costs: $40-70 per board depending on Trex product line
- Warranty coverage: 25-year limited warranty on most Trex products
- Maintenance: Minimal compared to wood decking
Sources & References
- Trex Company - Product SpecificationsOfficial Trex product specifications and installation guidelines
- North American Deck and Railing Association (NADRA) - Installation StandardsProfessional standards for deck construction and installation
- American Wood Council (AWC) - Construction StandardsStandards for deck construction and structural requirements
Need help with other decking calculations? Check out our retaining wall calculator and stair stringer calculator.
Get Custom Calculator for Your BusinessTrex Calculator Examples
Deck Properties:
- Dimensions: 20' × 12'
- Area: 240 sq ft
- Joist Spacing: 16 inches
- Trex Type: Enhance ($55/board)
Calculation Steps:
- Calculate boards: 20' ÷ 1.33' = 15 boards
- Add waste factor: 15 × 1.10 = 16.5 → 17 boards
- Calculate material cost: 17 × $55 = $935
- Calculate installation: 240 × $8 = $1,920
Result: 17 boards needed, $2,855 total cost
Professional installation recommended for warranty coverage.
Small Deck Example
12' × 8' deck, Trex Select
9 boards, $1,440 total
Large Deck Example
30' × 16' deck, Trex Transcend
25 boards, $8,640 total
Frequently Asked Questions
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