18 Free Deck Calculators
Everything you need to plan, price, and build your deck — from total cost down to baluster spacing. Trusted by thousands of homeowners and contractors.
- 18 specialized tools
- Updated 2026 pricing
- 100% free, no signup
Choose your calculator
Organized by what you're trying to figure out. All tools are free and instant.
Cost & Estimation
Total project cost, material totals, and labor estimates.
Deck Cost Calculator
Estimate total deck cost by size, material, and features.
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Cost Per Square Foot Calculator
Compare installed cost per square foot across materials.
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Deck Labor Cost Calculator
Estimate labor cost separately from materials.
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Deck Permit Cost Calculator
Estimate building permit fees for your deck project.
Open calculator →Framing & Structure
Joists, beams, posts, footings, and load-bearing structure.
Deck Joist Calculator
Calculate the number of joists required by spacing.
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Deck Beam Span Calculator
Determine maximum beam span by lumber size and joist length.
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Deck Footing & Concrete Calculator
Calculate concrete needed for deck footings.
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Deck Post Calculator
Determine post count, size, and load.
Open calculator →Decking Boards
Board count, linear footage, and material waste.
Stairs & Railings
Stair stringers, treads, balusters, and railing materials.
Finishing & Maintenance
Stain, sealer, fasteners, and ongoing maintenance.
Advanced Tools
Comparison tools and specialty calculations.
Top picks for your deck project
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Outdoor Solid Composite Decking Boards 96"x5.43"x1", Polymer Composite Decking for All Weather Use,Poolside,Backyard,Patio(6 Pcs,Redwood and Maple,21.72sqft)
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Egadis 1 Pack 36 in. H x 5 ft. W Porch and Deck Railing Kit Without Post, Black Textured Powder-Coat Finish Modular Aluminum Railing System for Outdoor Decks, Porches & Balconies(1 Panel)
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SUNVIE All-in-One Low Voltage Deck Lights Kit, 8 Pack 5W Low Voltage Landscape Lighting with 60W Transformer 100FT Wire and Connectors, 3000K 12-24V AC/DC LED Deck Step Lights for Fence Post Patio
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Ready Seal Exterior Wood Stain | Semi-Transparent Oil-Based Formula | Professional Grade Stain and Sealer in One | Ideal for Decks, Fences, Pergolas, Wood Siding & More | 5 Gallon | Natural Cedar
View on AmazonBuilding something else? Try our sister calculators
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