Free Construction Calculators
Professional-grade material calculators for contractors and DIYers. Estimate concrete, roofing, lumber, flooring, and more with accurate waste factors and cost estimates.
Why Use Our Construction Calculators?
Ordering the right amount of materials is critical for any construction project. Order too little and you'll face costly delays and potential structural issues. Order too much and you're wasting money on materials you can't return.
Our calculators include real-world waste factors, account for standard material sizes, and help you estimate costs accurately. Built with input from experienced contractors and updated for current material specifications.
Concrete Calculators
Concrete Calculator
Calculate cubic yards for slabs, footings, columns, and stairs with waste factors and cost estimates.
Calculate ConcreteConcrete Slab Calculator
Calculate concrete volume, rebar, and gravel base for patios, driveways, and garage slabs.
Calculate SlabConcrete Steps Calculator
Calculate concrete volume for porch steps, entry stairs, and landing areas.
Calculate StepsFooting Calculator
Calculate concrete and rebar for foundation footings, piers, and pad footings.
Calculate FootingRebar Calculator
Calculate rebar quantity, spacing, and overlap requirements for reinforced concrete.
Calculate RebarFence Post Concrete Calculator
Calculate concrete bags for fence post holes based on post size and depth.
Calculate PostsLumber & Framing Calculators
Lumber Calculator
Calculate board feet and framing materials for your construction project.
Calculate LumberBoard Feet Calculator
Convert lumber dimensions to board feet with pricing and weight estimates.
Calculate Board FeetStud Calculator
Calculate wall studs, plates, and headers for framing with 16" or 24" OC spacing.
Calculate StudsJoist Span Calculator
Determine maximum joist spans based on size, spacing, species, and load requirements.
Calculate SpanLumber Weight Calculator
Calculate lumber weight by species, dimensions, and moisture content.
Calculate WeightRoofing Calculators
Roofing Calculator
Calculate roofing squares, shingles, underlayment, and materials with pitch factors.
Calculate RoofingRoof Pitch Calculator
Calculate roof pitch, angle, and area multiplier from rise and run measurements.
Calculate PitchMetal Roofing Calculator
Calculate metal panels, screws, trim, and ridge cap for metal roof installations.
Calculate Metal RoofDecking Calculators
Deck Calculator
Calculate complete deck materials including joists, boards, and railings.
Calculate DeckDeck Board Calculator
Calculate deck boards with optimized layouts to minimize waste and cuts.
Calculate BoardsDeck Stair Calculator
Calculate stair stringers, rise, run, and treads for code-compliant stairs.
Calculate StairsDeck Footing Calculator
Calculate footing size, depth, and concrete for deck post foundations.
Calculate FootingsDeck Railing Calculator
Calculate posts, balusters, rails, and hardware for deck railings.
Calculate RailingPaint Calculators
Exterior Paint Calculator
Calculate paint for house exteriors including siding, trim, and multiple stories.
Calculate ExteriorFlooring & Tile Calculators
Tile Calculator
Calculate tiles, grout, and adhesive with waste factor for floors and walls.
Calculate TileHardwood Flooring Calculator
Calculate hardwood flooring square footage with waste and installation factors.
Calculate HardwoodLaminate Flooring Calculator
Calculate laminate planks and boxes needed for your room dimensions.
Calculate LaminateShower Tile Calculator
Calculate shower wall and floor tile, plus waterproofing and setting materials.
Calculate ShowerBacksplash Calculator
Calculate kitchen backsplash tile, thinset, and grout quantities.
Calculate BacksplashLandscaping & Outdoor Calculators
Mulch Calculator
Calculate cubic yards of mulch for garden beds with depth recommendations.
Calculate MulchTopsoil Calculator
Calculate topsoil cubic yards for gardens, lawns, and raised beds.
Calculate TopsoilRetaining Wall Calculator
Calculate retaining wall blocks, base material, and cap blocks.
Calculate WallDrywall Calculators
Drywall Mud Calculator
Calculate joint compound quantities based on finish level and square footage.
Calculate MudStair Calculators
Stair Stringer Calculator
Calculate stringer dimensions, rise, run, and cut angles for code compliance.
Calculate StringersSpiral Stair Calculator
Calculate spiral staircase dimensions, treads, and rotation.
Calculate SpiralElectrical Calculators
Wire Size Calculator
Calculate proper wire gauge based on amperage, distance, and voltage drop.
Calculate Wire SizeElectrical Load Calculator
Calculate total electrical load and service panel size requirements.
Calculate LoadOutlet Spacing Calculator
Calculate NEC-compliant outlet placement and quantity for rooms.
Calculate OutletsHVAC Calculators
BTU Calculator
Calculate heating and cooling BTU requirements for rooms and buildings.
Calculate BTUDuct Size Calculator
Calculate duct dimensions based on CFM requirements and air velocity.
Calculate DuctMasonry Calculators
Insulation Calculator
Calculate insulation R-value and materials for walls, attics, and floors.
Calculate InsulationMaterial Estimating Tips
Always Add Waste Factor
Materials get cut, broken, or damaged during installation. Add 10-15% to your calculations for most materials. Complex patterns or first-time DIYers should add more.
Check Local Codes
Building codes vary by location. Always verify requirements for structural elements like footings, beams, and electrical work with your local building department.
Measure Twice, Order Once
Double-check all measurements before ordering. It's easier to re-measure than to return materials or wait for additional deliveries.
Consider Delivery Minimums
Many suppliers have minimum orders for delivery (e.g., 1 yard of concrete). Factor this into your planning to avoid short-load fees.
Free Tools for Builders
All our construction calculators are completely free, require no signup, and work on any device. Used by thousands of contractors and DIYers every month to estimate materials accurately and bid projects confidently.