Deck Calculators — Free Cost & Material Estimators
Plan your deck project with accurate cost and material estimates. Our deck calculators cover joist spans, post spacing, footings, stairs, and more — helping you build to code and on budget.
Deck Joist Calculator
Calculate deck joist spans per IRC code tables and estimate lumber costs. Check pass/fail for any joist size, spacing, and wood species.
Deck Post Spacing Calculator
Calculate deck post spacing, count, and cost per IRC beam span tables. Check if your beam supports your post spacing.
Deck Stair Calculator
Calculate deck stair dimensions, stringers, and costs per IRC code. Get rise, run, and material estimates for code-compliant stairs.
Baluster Spacing Calculator
Calculate deck baluster spacing for IRC code compliance. Get exact spacing, quantity, and costs for wood, composite, aluminum, and glass balusters.
Deck Board Calculator
Calculate how many deck boards you need by deck size, board width, and board length. Includes screw estimates and material cost.
Composite Decking Calculator
Estimate composite decking costs by deck size, board tier, fastener type, and railing. Compare Trex, TimberTech, and Azek pricing.
Deck Cost Calculator
Estimate total deck building costs including materials, labor, railing, stairs, and permits. Compare wood, composite, PVC, and hardwood.
Deck Cost Calculator
Calculate deck costs by size, material, and height. Compare pressure-treated, cedar, composite, PVC, and ipe options.
Deck Joist Calculator
Calculate deck joists needed by size and spacing. Get joist count, max span, and lumber quantities per IRC 2021 span tables.
Deck Footing Calculator
Calculate deck footings needed and concrete volume by deck size. Get footing count, concrete bags needed, and material costs.
Deck Staining Cost Calculator
Calculate deck staining costs by area and stain type. Get estimates for clear sealer, semi-transparent, solid, and premium oil stains.
Pergola Cost Calculator
Calculate pergola costs by material and size. Get estimates for pressure-treated wood, cedar, vinyl, and aluminum pergolas with shade and lighting options.
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Frequently Asked Questions
How much does it cost to build a deck? +
Deck costs range from $15–$35 per sq ft for pressure-treated wood, $25–$50 for composite, and $30–$60+ for exotic hardwood. A standard 12×16 deck costs $3,000–$10,000+ depending on material, height, and features like railings and stairs.
Do I need a permit to build a deck? +
Most municipalities require a building permit for attached decks and decks over 30 inches above grade. Permits typically cost $100–$500 and require compliance with IRC codes for joist spans, post spacing, and railing requirements.