Concrete Calculator
PopularCalculate the exact volume of concrete needed for slabs, footings, and columns in cubic metres, feet, or yards.
- Slabs
- Footings
- Volume
Free Construction Calculators
Precise tools for every construction project
ConstructMetric delivers free, engineer-grade calculators for common construction tasks. From concrete slabs to brick walls, paint coverage to roofing area — get accurate measurements quickly, with the formulas shown so you can verify the numbers.
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10+ calculators
Concrete, brick, paint, roofing, asphalt, gravel, carpet, and more.
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Metric + imperial
Switch units inside the tools for fast comparisons.
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Formulas included
Transparent math so you can verify results.
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No signup required
Free to use with no account or paywall.
Calculators
Pick a calculator
Each tool is designed for fast estimating and double-checking quantities in the field or office. Use waste allowances where appropriate, and cross-check supplier specs (coverage rates, densities, roll widths) before ordering.
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Brick Calculator
Estimate bricks for a wall using dimensions, openings, joint thickness, and waste allowance.
- Walls
- Mortar
- Count
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Flooring Calculator
Estimate tiles or planks using room area, waste allowance, and optional box coverage.
- Tiles
- Planks
- Area
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Paint Calculator
Estimate paint for walls and ceilings using coats, coverage, and waste allowance.
- Walls
- Litres
- Coverage
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Roofing Calculator
Estimate roof area from footprint and pitch, then calculate bundles (shingles) or sheets (by coverage).
- Shingles
- Sheets
- Area
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Plywood / Sheathing Calculator
Estimate plywood/OSB sheets from surface area, openings, sheet size (4×8 etc.), and waste allowance.
- Sheathing
- Sheets
- Waste
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Gravel & Aggregate
Calculate tonnes or cubic metres of gravel, sand, or aggregate for foundations and paths.
- Gravel
- Sand
- Tonnes
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Asphalt Calculator
Estimate asphalt tonnage from area and compacted thickness using a density-based conversion.
- Tonnage
- Driveways
- Thickness
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Birdsmouth Cut Calculator
Estimate birdsmouth notch depth and height above plate (HAP) from pitch, rafter depth, and seat cut length.
- Rafters
- Pitch
- HAP
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Carpet Calculator
Estimate broadloom carpet (roll goods) by roll width or carpet tiles by tile size, including waste allowance.
- Broadloom
- Tiles
- Square yards
What you can calculate
Common estimating tasks covered by ConstructMetric include:
- Concrete volume for slabs, footings, walls, columns
- Brick quantities with openings and waste
- Flooring tiles/planks with waste and box coverage
- Paint quantities based on coats and coverage
- Roofing area and bundle/sheet estimates
- Asphalt tonnage and gravel/aggregate volume conversions
Workflow
Estimate in minutes
A consistent workflow across calculators helps you move quickly from measurements to an order quantity.
1. Enter dimensions
Use metric or imperial units. Add openings or quantity where the calculator supports it.
2. Set assumptions
Choose waste, coverage, densities, roll widths, or box coverage based on your project and supplier.
3. Review results
Get an order quantity plus helpful secondary units (m²/ft²/yd², bags, tons) where applicable.
Why ConstructMetric
Built for accuracy and speed
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No fluff, just results
Every calculator is purpose-built. Enter dimensions, get results. No ads cluttering the tool, no account required.
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Formula transparency
Every calculator shows the exact formula used so you can verify the maths yourself — no black boxes.
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Works on any device
Mobile-first responsive design means the tools work perfectly on the job site, in the truck, or at the desk.
Blog
Latest construction insights
Short, practical reads on estimating, project management, and building methods.
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The Future of Construction Project Management Techniques
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Green building upgrades reduce utility bills, improve indoor air quality, and increase long-term property value through efficient, healthy design.
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Explore how CLT, hempcrete, mycelium bricks, and self-healing concrete are reducing embodied carbon while improving durability and indoor air quality.
FAQs
Quick answers
- Are the calculators free to use?
- Yes. ConstructMetric calculators are free to use and do not require an account.
- Do the calculators support metric and imperial units?
- Most calculators support both metric and imperial units. Use the unit toggle inside each calculator to switch between systems.
- How accurate are the results?
- Results are estimates based on your inputs and standard formulas. Always verify assumptions (waste, density, coverage, roll widths) against your project specs and supplier data.
- Should I add waste to material quantities?
- In most cases, yes. Waste accounts for cuts, breakage, pattern alignment, and installation realities. The right percentage depends on the material and layout complexity.