Free Online Construction Calculators

Carpentry & Framing Calculators cover the layout and material math behind building a wood-framed structure. Calculate framing spacing for studs and joists with the framing calculator and floor joist calculator, or figure out lumber quantities and lumber weight for a project. The trim and molding, shiplap, wainscoting, and board and batten calculators handle interior finish carpentry, while the baluster and spindle spacing calculators lay out stair and railing components.

This section also includes a plywood calculator for sheet goods, cabinet door calculator for custom cabinetry, door header size calculator for structural openings, and a DIY shed cost calculator for planning a small outbuilding.

Concrete & Masonry Calculators help you estimate materials for everything from a slab to a retaining wall. Calculate concrete volume with the concrete mix, concrete slab, concrete footing, and concrete column calculators, or figure out rebar and rebar weight and size for reinforcement. Brick and block projects are covered by the brick calculator, concrete block calculator, concrete block fill calculator, and block mortar calculator.

This section also includes concrete steps, concrete tube/sonotube, pier foundation, strip foundation, and post hole concrete calculators for foundation work, plus grout, mortar, thinset, hole volume, concrete weight, concrete reinforcing mesh, concrete driveway cost, and retaining wall calculators for finishing and specialty masonry jobs.

Decking Calculators help you plan lumber, foundation, and railing materials for a new or replacement deck. Use the decking calculator or composite decking calculator to estimate deck boards, or the deck board material calculator to compare wood and composite options. The deck foundation calculator sizes footings and posts, the deck railing calculator estimates railing materials, and the pergola calculator handles an attached or freestanding shade structure.

Driveway & Pavement Calculators estimate the materials needed for a new driveway or paved area. Calculate asphalt and asphalt sealer quantities for a blacktop driveway, or use the concrete driveway calculator and gravel driveway calculator for other surface types. The road base calculator and roadway fill volume calculator size the aggregate base layer beneath asphalt or concrete pavement.

Electrical Calculators for construction cover a handful of key sizing decisions for home and jobsite power. Size a backup generator with the generator size calculator, plan electrical panel layout with the junction box sizing calculator, or estimate energy use and output with the LED lighting calculator.

Fencing Calculators help you plan materials and layout for a new fence. Use the fence calculator or fence perimeter calculator to estimate total materials, or the chain link fence calculator and vinyl fence calculator for specific fence types. The fence post depth calculator and fence post spacing calculator make sure posts are set correctly for wind load and stability.

Flooring Calculators estimate materials for a new floor installation. Use the flooring calculator for a general estimate, or dedicated hardwood flooring, laminate flooring, vinyl flooring, and epoxy floor calculators for specific flooring types. The linear feet to square feet calculator converts between common flooring measurement units.

Home Improvement Calculators cover general renovation and project-planning math that spans multiple trades. Estimate a full project with the construction cost estimator and building material list calculator, or calculate markup and profit margin if you're pricing out contractor work. The floor area ratio and square yard calculators handle zoning and area measurements, while the equipment depreciation calculator tracks tool and machinery value over time.

This section also includes a chicken coop size calculator and hoop house calculator for backyard structures, a fire glass calculator for fire pit and fireplace projects, and a lawn mowing calculator for outdoor maintenance costs.

Landscaping Calculators estimate materials for hardscaping, planting, and yard drainage projects. Calculate paver, paver base, and paver sand quantities for a patio or walkway, or estimate crushed stone, river rock, rip rap, limestone, and stone for a decorative or functional installation. The sand calculator and polymeric sand calculator handle joint fill and base material, while the topsoil calculator estimates fill for garden beds.

This section also includes a French drain calculator for yard drainage, a landscape edging calculator for border materials, a pond calculator for water features, a raised bed calculator and plant and flower calculator for garden planning, and a sod weight calculator for turf installation.

Measurement & Conversion Calculators handle the unit conversions that come up constantly on a construction site. Convert feet and inches, work with inch fractions, or calculate acreage and elevation grade for site work. The board footage to linear feet and square feet to cubic yards calculators convert between common lumber and material units, while the gallons per square foot and scale conversion calculators cover coverage rates and drawing scales.

Metal & Material Weight Calculators estimate the weight of common construction materials for shipping, handling, and structural load calculations. Calculate steel weight and steel plate weight, or use the metal weight calculator and plate weight calculator for other metals and shapes. The aluminum weight calculator, glass weight calculator, and log weight calculator cover specific materials, while the size to weight and tonnage calculators convert dimensions into shippable weight.

Painting & Walls Calculators estimate materials for interior and exterior wall finishing. Calculate drywall sheets with the drywall calculator, or estimate insulation, siding, and vinyl siding for exterior walls. The exterior wall calculator and wall square footage calculator handle general area estimates, while deck stain and fence stain calculators cover wood finishing projects.

This section also includes a stucco calculator and sealant calculator for exterior coatings and waterproofing.

Plumbing & HVAC Calculators size heating, cooling, and water system components for residential and commercial buildings. Calculate AC tonnage, furnace BTU, and boiler size to properly size heating and cooling equipment, or use the CFM calculator and air changes per hour calculator for ventilation design. Water flow tools include gallons per minute (GPM), liters per minute, water velocity, and pipe volume calculators.

This section also covers pipe weight, refrigerant line charge, fire flow, and window air conditioner size calculators for specialized plumbing and HVAC sizing tasks.

Pool & Water Calculators estimate volume and equipment sizing for pools, spas, and water tanks. Calculate pool volume and size a pool pump with the pool pump size calculator, or estimate hot tub size for a spa installation. The tank volume calculator, tank fill calculator, and water tank size calculator cover water storage tanks for irrigation, wells, or emergency supply.

Roofing Calculators cover the material and layout math for a new roof or reroofing project. Calculate roof pitch and rafter length, or estimate roof shingle, metal roof, roof underlayment, and ice and water shield materials for the roofing surface. The roof truss calculator and roof sheathing calculator size structural roof components, while the gambrel roof calculator and birdsmouth cut calculator handle specific framing details.

This section also includes a roof vent calculator for attic ventilation and a snow load calculator for structural safety in snowy climates.

Stairs Calculators help you design a code-compliant staircase with the right rise, run, and materials. Use the stair calculator for standard riser and tread dimensions, or the spiral staircase calculator for a compact circular design. The stair stringer calculator lays out the supporting structure, while stair railing and stair carpet calculators cover finishing details, and the concrete stairs calculator handles poured concrete steps.

Structural & Engineering Calculators cover specialized geometry and mechanical calculations used across construction trades. Calculate ramp slope and ladder angle for safe access, or work out arch dimensions and rolling offset for structural and piping layouts. Machinists and metalworkers can use the thread calculator, thread pitch calculator, pitch diameter calculator, taper calculator, and rivet size calculator.

This section also includes a clearance hole calculator, spindle speed calculator, material removal rate calculator, and SAG calculator for machining and fabrication work.

Surveying & Earthwork Calculators cover site preparation and land measurement before construction begins. Calculate cut and fill volumes for grading, or estimate excavation volume for foundations and utility trenches. The land area calculator and lot coverage calculator measure property dimensions and zoning compliance, while the setback calculator checks required distances from property lines and the compaction factor calculator adjusts soil volume for compaction.

Window & Door Calculators help you size openings and materials for windows, doors, and screens. Use the window size calculator and door size calculator for standard rough openings, or the garage door size calculator for larger openings. The screen size calculator and window film calculator cover window treatments and coverings.