Loading the page...
Preparing tools and content for you. This usually takes a second.
Preparing tools and content for you. This usually takes a second.
Fetching calculator categories and tools for this section.
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: February 2, 2026
Need a custom decking calculator for your business? Get a Quote
Deck Area
240 sq ft
Boards Needed
2
Total Boards
3
Waste Boards
1
Recommendation
Medium deck project. Professional installation recommended for best results.
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
For a 20' × 12' deck with Trex Enhance:
Total Boards
17
Total Cost
$2,920
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.
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
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.
Need help with other decking calculations? Check out our retaining wall calculator and stair stringer calculator.
Get Custom Calculator for Your BusinessResult: 17 boards needed, $2,855 total cost
Professional installation recommended for warranty coverage.
12' × 8' deck, Trex Select
9 boards, $1,440 total
30' × 16' deck, Trex Transcend
25 boards, $8,640 total
Share it with others who need help with Trex calculations
Suggested hashtags: #TrexCalculator #Decking #Composite #HomeImprovement #Calculator