Free tools
Construction Calculators
46 free calculators for property owners and DIY builders — from concrete yardage and roofing squares to culvert sizing and haul time. No sign-up required.
Site Prep & Excavation
Driveway Gravel CalculatorEstimate the gravel needed for a driveway: surface area, cubic yards to order, and tons — using real material densities, not a one-size-fits-all factor.Open calculator →Cut & Fill Earthwork BalanceBalance cut and fill volumes across a site: find out how much dirt you need to import or export, and how many truck loads that is.Open calculator →Soil Swell & Shrink ConverterConvert an in-place soil volume to loose haul volume and compacted placed volume using swell and shrink factors.Open calculator →Topsoil Strip & StockpileEstimate the in-place and loose volumes for stripping topsoil from a building site, and how many truck loads to move the stockpile.Open calculator →Aggregate / Gravel Base CalculatorCalculate the compacted aggregate base volume and tons to order for pads, roads, or any rectangular area, with a 5% waste factor.Open calculator →Land Clearing & Grubbing EstimatorEstimate machine hours and budget cost to clear and grub acreage before construction.Open calculator →Driveway Base Rock CalculatorCalculate compacted volume, order volume (+12% compaction allowance), and tonnage for a driveway base rock section.Open calculator →Silt Fence / SWPPP TotalizerCount the posts, rolls, and trench spoil for a silt fence installation — the first number your SWPPP contractor will ask for.Open calculator →
Concrete & Foundations
Footing Concrete & RebarCalculate concrete volume and rebar for a continuous footing, with 10% waste and 10% lap splice allowance.Open calculator →Foundation / Stem Wall ConcreteEstimate concrete volume, form contact area, and wall face area for a poured foundation or stem wall.Open calculator →Slab on GradeCalculate concrete, rebar grid, and vapor barrier quantities for a slab on grade.Open calculator →Concrete Pad / Slab CalculatorEstimate concrete for a rectangular pad or slab with a 10% waste factor.Open calculator →Concrete Bag CountHow many bags of concrete do you need? Estimates 80-, 60-, and 40-lb bags for a rectangular pour, with 10% waste.Open calculator →
Masonry
Framing & Sheathing
Roofing
Electrical
Plumbing
HVAC & Mechanical
Duct Sheet Metal EstimatorEstimate the sheet metal area and steel weight for a rectangular duct run — useful for getting duct fabrication quotes.Open calculator →Cooling Load (Tonnage) EstimatorQuick rule-of-thumb cooling load estimate to size an HVAC system.Open calculator →System Airflow (CFM)Calculate total system airflow based on your HVAC equipment size and airflow per ton.Open calculator →
Insulation
Batt / Roll InsulationEstimate batt or roll insulation bundles for walls, floors, or roofs.Open calculator →Blown-In InsulationEstimate bags of blown-in (loose-fill) insulation for an attic or wall cavity.Open calculator →Spray Foam (Board Feet)Calculate board feet and two-component kit count for spray foam insulation.Open calculator →
Interior Finishes
Sheetrock & Joint CompoundEstimate 4×12 drywall sheets and joint-compound buckets for a room or whole house.Open calculator →Floor Tile / Plank TotalizerCalculate net floor area and order quantity (with 12% waste) for tile, hardwood, or vinyl plank.Open calculator →Wall Area & Paint GallonsEstimate coated area and gallon count for interior or exterior painting.Open calculator →
Site Utilities
Trench Volume & Bedding CalculatorCalculate the bedding stone needed for a trench: volume in cubic yards and tons of #57 stone with a 10% waste factor.Open calculator →Utility Trench & BeddingCalculate excavation, bedding stone, and backfill volumes for a utility trench — accounting for pipe displacement.Open calculator →Pipe Run & Fittings CountCount pipe sticks and couplings for any run length and stick length.Open calculator →Septic Drain Field GravelEstimate drain rock, perforated pipe, and filter fabric for a septic absorption field.Open calculator →Septic System TakeoffCount tanks, chambers, end caps, distribution box, inspection ports, and pipe for a septic system.Open calculator →Culvert Manning's Flow CapacityCalculate the flow capacity of a circular culvert and check whether it's large enough for your site's drainage.Open calculator →
Materials Takeoff
Ecology Block TakeoffCount full blocks, half blocks, and caps for an ecology block retaining wall in a running bond pattern.Open calculator →Wall Filter FabricCalculate rolls of filter fabric needed to line a retaining wall, including a fold allowance at the base.Open calculator →Road / Driveway FabricCalculate rolls of geotextile fabric for a road or driveway, accounting for side laps and overage.Open calculator →
Demolition
Debris Volume & Dumpster CountEstimate debris volume and roll-off dumpsters needed to demolish a building, using footprint, building type, and a debris factor.Open calculator →Concrete / Slab RemovalEstimate in-place volume, disposal weight, and broken volume for concrete slab removal.Open calculator →
Landscaping
Fencing
Hauling
All calculators are free. Results are estimates — verify quantities with your supplier or a licensed professional before ordering materials.