Free Construction Calculators for Contractors

No sign-up required. Pick a calculator and get your answer in 60 seconds. All prices updated quarterly from HomeAdvisor, Angi, and U.S. BLS data.

Roof

Soffit Calculator

Calculate soffit materials and vents for any roof.

Roof Area Calculator

Calculate roof area from house dimensions and pitch.

Gutter Installation Cost Calculator

Estimate gutter installation cost by material and length.

Metal Roof Cost Calculator

Estimate metal roof installation cost by type and area.

Gambrel Roof Calculator

Calculate gambrel roof area, rafters, and cost.

Roof Replacement Cost Calculator

Estimate 2026 roof replacement cost by material, pitch, tear-off, and region.

Siding & Drywall

Hardie Board Siding Calculator

Estimate James Hardie siding panels, trim, and cost.

Siding Calculator

Estimate siding cost across 6 materials.

Drywall Calculator

Calculate drywall sheets and materials needed.

Paint Calculator

Calculate paint gallons and cost for any room.

Wallpaper Calculator

Calculate wallpaper rolls needed for any room.

Window Replacement Cost Calculator

Estimate window replacement cost by type, frame, glass, installation, and region. Includes energy savings.

Kitchen Cabinet Painting Cost Calculator

Estimate cabinet painting cost by linear foot or door count. Prep level 3x driver, shaker +20% labor.

Plumbing

House Repiping Cost Calculator

Estimate whole-house repipe cost by pipe material.

Flooring

Epoxy Flooring Cost Calculator

Estimate epoxy garage floor cost by square footage.

Laminate Flooring Calculator

Calculate cartons and cost for laminate flooring.

Flooring Square Foot Calculator

Calculate square footage and cost across 6 flooring types.

Tile Calculator

Calculate tile count, boxes, and installed cost.

Carpet Calculator

Calculate carpet square yards, padding, and installed cost.

Concrete & Asphalt

Concrete Driveway Cost Calculator

Estimate concrete driveway installation cost.

Concrete Block Calculator

Calculate CMU blocks needed for walls.

Gravel Calculator

Calculate gravel cubic yards, tons, and cost for driveways.

Concrete Calculator

Calculate cubic yards, bags, and cost for concrete.

Asphalt Calculator

Calculate tons, cubic yards, and cost for asphalt.

Landscape

Pressure Washing Estimate Calculator

Estimate pressure washing job cost by surface area.

Landscaping Cost Calculator

Estimate landscaping cost by project type.

Mulch Calculator

Calculate mulch cubic yards, bags, and cost for landscaping.

Insulation

Spray Foam Insulation Cost Calculator

Estimate spray foam cost by board feet.

Insulation R-Value Calculator

Calculate recommended R-value, material, and cost by climate zone.

HVAC

Ductwork Replacement Cost Calculator

Estimate HVAC ductwork replacement cost.

Heat Pump Cost Calculator

Estimate heat pump size and cost.

Furnace Size Calculator

Calculate furnace BTU by house size and climate.

Deck & Fence

Deck Footing Calculator

Calculate deck footing count and depth.

Deck Joist Span Calculator

Calculate max joist span by size and spacing.

Chain Link Fence Calculator

Estimate chain link fence materials and installed cost.

Deck Railing Spindle Spacing Calculator

Calculate spindle count and code-compliant spacing.

Deck Stair Calculator

Calculate stair steps, stringers, and treads for decks.

Fence Painting Cost Calculator

Estimate fence staining/painting cost per linear foot. Condition (peeling +50% labor), stain vs paint, chain-link mesh factor.

Remodel

Bathroom Remodel Cost Calculator

Estimate bathroom remodel cost.

Kitchen Remodel Cost Calculator

Estimate kitchen remodel cost by layout and tier.

Pool & Spa

Pool Chemical Calculator

Calculate chlorine, shock, and salt dosage and annual cost from pool volume.

Pool Resurfacing Cost Calculator

Estimate pool resurfacing cost by finish, pool type, size, region, and season. 20-year total cost of ownership vs plaster.

Garage Door

Garage Door Spring Calculator

Estimate garage door spring type, size, and replacement cost from door dimensions.

Foundation & Structural

Foundation Repair Cost Calculator

Estimate foundation repair cost by damage type, repair method, and pier count.

Retaining Wall Cost Calculator

Estimate retaining wall cost by material, height, soil, drainage, and region. 4 ft engineer threshold.

Tile & Stone

Shower Tile Calculator

Estimate shower tile cost: 3 walls + forced mosaic floor + waterproofing, niche, curb, bench, drain.

Solar & Energy

Solar Panel Angle Calculator

Calculate optimal solar panel tilt angle by latitude, season, and load profile. Classic formula vs simple lat±15 rule, azimuth, pitched-roof compensation.

Looking for our legacy tools?

We've been building trade-specific calculators since 2026. Our original tools cover software cost comparison and trade estimates — all still free.

Browse all legacy tools →

Estimating Software by Trade

Done calculating material costs? Compare the best estimating software for your trade — independent reviews based on hands-on testing.

HVAC Plumbing Electrical Roofing Landscaping General Small Contractor Free Options

Frequently Asked Questions

Are these construction calculators really free?

Yes. Every calculator on this page is free to use, with no sign-up or email required. We build these tools to help contractors and homeowners get quick estimates before committing to a project.

How accurate are the cost estimates?

Our calculators use publicly available 2026 data from HomeAdvisor, Angi, the U.S. Bureau of Labor Statistics, NRCA, and Remodeling Magazine's Cost vs. Value Report. Each calculator shows its data sources and 'last verified' date. Estimates are for budgeting only — always get 2-3 quotes from licensed contractors for actual pricing.

Can homeowners use these tools, or are they only for contractors?

Both. Contractors use them to speed up bids and material takeoffs; homeowners use them to research project costs before talking to contractors. If you're a homeowner, our /cost-guides/ section has plain-English explanations of what each project typically costs.

How often are material prices updated?

We re-verify prices quarterly (every January, April, July, October). Each calculator displays its 'Last verified' date so you know exactly when the data was checked. If a calculator shows a date older than 6 months, we'll flag it for review.

Do these calculators work on mobile?

Yes. All inputs use a minimum 44px touch target and 16px font size to prevent iOS auto-zoom. The layouts are responsive down to 375px width (iPhone SE). No app install required.

Why do you recommend specific estimating software on each calculator?

When a contractor finishes a calculation, the next step is usually turning that number into a professional bid. We recommend software we've tested (see our full reviews at /reviews/) and may earn a commission if you sign up through our links. This doesn't affect the calculator's accuracy — the math is the same either way.