Professional Construction
Calculators
Free, fast, and accurate estimates for DIY homeowners, contractors, and construction professionals. Start your project right.
Why Use ProBuilderCalc?
Getting the math wrong on a construction project is expensive. A small error in a concrete order or a staircase layout can mean wasted materials, rework, and delays. ProBuilderCalc gives you precise estimates and the context to use them—so you order the right amount, the first time.
Every calculator is built for the way contractors and DIYers actually work: with industry-standard waste factors (like the 10% concrete rule), formulas you can verify, and step-by-step guides that explain the why behind the numbers. Our tools are designed for the US, UK, and Canada and are grounded in real building practice—not generic one-size-fits-all formulas.
- 1.Expert-backed guides — Each tool comes with a detailed guide so you understand waste factors, codes, and best practices.
- 2.Transparent formulas — We don't hide the math. Verify our results against your own specs and local standards.
- 3.Free, no sign-up — All calculators are free to use. No account required—just open a tool and start calculating.
Start with a Common Project
Jump straight to the calculator you need for concrete, roofing, budgeting, or lumber.
Concrete & Slab
Mix volume, bags, and ready-mix estimates.
Roof Pitch
Pitch, angle, rafter length, and area.
Construction Cost
High-level budget for new builds.
Lumber & Wood
Board feet and piece counts.
How we turn your draft into a safe order
Draft estimate
10
cu yd · exact volume
Final order
11
cu yd · safe to order
Our Tools
Choose from 20 construction calculators: materials, measurements, cost estimators, and structural tools. Each includes a full guide and disclaimer.
Materials
Concrete Mix Calculator
Calculate bags of concrete mix, cement, sand, and gravel.
Brick & Mortar Calculator
Estimate bricks and mortar required for a wall.
Paint Coverage Calculator
Calculate gallons of paint needed for interior/exterior walls.
Tile & Flooring Calculator
Estimate tiles or flooring planks and box requirements.
Lumber & Wood Calculator
Calculate board feet and total lumber piece counts.
Plaster Calculator
Determine plaster and water required for finishing walls.
Measurements
Roof Pitch Calculator
Determine roof pitch, angle, rafter length, and area.
Area & Perimeter Calculator
Calculate area and perimeter for various shapes.
Staircase Calculator
Find rise, run, stringer length, and total steps.
Wall Square Footage
Calculate wall area excluding doors and windows.
Foundation Calculator
Estimate concrete required for footings and foundations.
Room Volume Calculator
Determine total cubic volume of a given room space.
Cost Estimators
Construction Cost
High-level cost estimator for new builds.
Material Cost Calculator
Estimate total material costs based on unit pricing.
Labor Cost Estimator
Calculate labor costs based on hourly rates and time.
Paint Cost Calculator
Estimate total spend for interior and exterior painting.
Structural
Sand & Gravel Calculator
Calculate tons or cubic yards of aggregate base.
Steel & Rebar Calculator
Estimate length and weight of rebar grids.
Concrete Slab Calculator
Volume and material calculations for flat slabs.
Fence Material Calculator
Estimate posts, rails, and pickets for a fence run.
More from ProBuilderCalc
How-to articles and construction guides that link to our calculators.
Read guides →About UsWho we are, our mission, and what makes our calculators different.
Learn more →ContactFeedback, error reports, or partnership inquiries—we’re here to help.
Get in touch →All results are estimates only. Always consult licensed professionals for your specific project.
Latest from our Guides
How to Read a Concrete Mix Ratio (1:2:3 Explained)
Master the standard 1:2:3 concrete mix ratio for your next DIY or professional project. Learn exactly what these numbers mean, how to measure materials, and when to adjust your mix.
The 10% Rule: Why Construction Waste Factors Can Make or Break Your Budget
Learn why ordering the exact amount of material often leads to project failure and how to correctly calculate the construction waste factor for concrete, lumber, and more.
Reading Blueprints: How to Extract Accurate Site Measurements
A comprehensive Blueprint Measurement Guide for DIYers. Learn how to find the exact length, depth, and volume requirements for your construction calculators.