Are Calquto's construction calculators free to use?

Yes. All 100+ calculators in the Home & Construction suite are free, run entirely in your browser, and don't require sign-up. Nothing you enter is stored or sent anywhere.

Do the calculators show step-by-step working, not just the answer?

Yes. Every calculator shows the full worked solution alongside the final answer — useful for checking a contractor's quote or planning material orders yourself, not just getting a number.

What areas of home improvement does this suite cover?

Concrete & masonry, paint & wall finishing, flooring & tiling, roofing, lumber & framing, home electrical, plumbing, HVAC & insulation, landscaping, windows & doors, and project cost & planning — 100+ calculators across 11 categories.

Construction Calculators: Concrete, Paint Coverage, Tile, Roof Shingles, Board Feet & 100+ More

Full Directory: All 101 Home & Construction Calculators

Every calculator below opens instantly in the suite above with full step-by-step working. Browse by category or use the search box to jump straight to one.

Concrete & Masonry (11)

Concrete Slab Volume Calculator — Cubic yards of concrete needed for a slab, from length, width, and thickness.
Concrete Bags Needed Calculator — Number of pre-mixed concrete bags required for a given volume.
Concrete Footing Calculator — Cubic yards of concrete for a rectangular footing or column base.
Concrete Column/Cylinder Calculator — Concrete needed for round columns, piers, or post holes.
Rebar Quantity & Weight Calculator — Number of rebar pieces and total weight for a reinforced slab or footing.
Mortar Mix Calculator — Mortar volume needed for a given number of bricks or blocks.
Brick Calculator — Number of standard bricks needed to cover a wall area.
CMU Block Calculator — Number of standard concrete blocks needed for a wall.
Gravel & Aggregate Calculator — Volume and weight of gravel needed for a base, path, or driveway.
Sand Calculator — Volume and weight of sand needed for a base or fill area.
Stucco Calculator — Bags of stucco mix needed for a wall area.

Paint & Wall Finishing (9)

Paint Coverage Calculator — Gallons of paint needed for a wall area, including doors/windows deduction and coats.
Wallpaper Calculator — Number of wallpaper rolls needed for a room.
Primer Coverage Calculator — Gallons of primer needed for a surface area.
Drywall Sheets Calculator — Number of 4×8 drywall sheets needed for a wall or ceiling area.
Drywall Joint Compound Calculator — Buckets of joint compound (mud) needed based on drywall area.
Paint Job Cost Estimator — Estimated total cost of a paint job from materials and labor.
Ceiling Paint Calculator — Gallons of ceiling paint needed based on room dimensions.
Exterior Siding Paint Calculator — Gallons of exterior paint needed for siding, accounting for texture.
Caulk/Sealant Calculator — Tubes of caulk needed for a total joint length.

Flooring & Tiling (10)

Tile Calculator — Number of tiles needed for a floor or wall area, including waste.
Tile Grout Calculator — Pounds of grout needed based on tile size and grout line width.
Tile Adhesive/Thinset Calculator — Bags of thinset mortar needed for a tile installation.
Hardwood/Laminate Flooring Calculator — Boxes of flooring needed for a room, including waste.
Carpet Calculator — Square yards of carpet needed for a room, and estimated cost.
Vinyl Flooring Calculator — Vinyl plank or sheet flooring needed for a room, including waste.
Baseboard/Trim Calculator — Linear feet of baseboard or trim needed, and pieces required.
Flooring Underlayment Calculator — Rolls or sheets of underlayment needed for a floor area.
Flooring Cost Estimator — Total flooring project cost from materials, underlayment, and installation labor.
Flooring Transition Strip Calculator — Number of transition strips needed between rooms of different flooring.

Roofing (8)

Roof Shingles Calculator — Bundles of shingles needed based on roof area, in squares.
Roof Area from Pitch Calculator — Actual (sloped) roof area from the footprint area and roof pitch.
Roof Pitch to Angle Converter — Converts a roof pitch (rise:12) to its angle in degrees.
Roofing Felt/Underlayment Calculator — Rolls of roofing felt or synthetic underlayment needed.
Gutter Length Calculator — Total gutter length and downspout count needed for a roof perimeter.
Roof Truss Spacing Calculator — Number of trusses needed for a given roof length and on-center spacing.
Metal Roofing Panel Calculator — Number of metal roofing panels needed for a roof.
Roof Ridge Cap Calculator — Bundles of ridge cap shingles needed for the roof ridge length.

Lumber & Framing (11)

Board Feet Calculator — Board feet of lumber from thickness, width, and length.
Stud Wall Framing Calculator — Number of wall studs needed for a given wall length and spacing.
Deck Board Calculator — Number of deck boards needed for a deck surface area.
Deck Joist Spacing Calculator — Number of joists needed for a deck frame.
Fence Calculator — Fence posts, rails, and panels needed for a total fence length.
Lumber Cost Estimator — Total lumber cost from board feet and price per board foot.
Plywood Sheets Calculator — Number of 4×8 plywood sheets needed for a given area.
Rafter Length Calculator — Length of roof rafters needed based on run and pitch.
Stair Stringer Calculator — Number of steps and rise/run per step for a staircase.
Basic Beam Span Estimator — Rough maximum span estimate for a dimensional lumber beam (for reference — always verify with local code/engineer).
Basic Header Size Estimator — Rough estimate for a window/door header size based on opening width (reference only).

Electrical (Home) (8)

Wire Gauge (Ampacity) Calculator — Recommended wire gauge for a given circuit amperage.
Voltage Drop Calculator — Voltage drop across a wire run based on length, current, and gauge resistance.
Home Electrical Load Calculator — Total connected load and required service size for a home\u2019s major appliances.
Circuit Breaker Size Calculator — Recommended breaker size from the connected load, following the 80% continuous-load rule.
Conduit Fill Calculator — Whether a set of wires fits within a conduit\u2019s 40% fill limit.
Electrical Box Fill Calculator — Minimum electrical box size (cu in) required for a given set of wires and devices.
Recessed Light Fixture Spacing Calculator — Number and spacing of recessed lights needed for even room coverage.
Home Generator Sizing Calculator — Minimum generator wattage needed to run selected essential loads.

Plumbing (8)

Pipe Volume/Water Capacity Calculator — Water volume held inside a length of pipe.
Water Heater Sizing Calculator — Recommended water heater tank size for a household.
Pipe Flow Rate Calculator — Water flow rate (GPM) through a pipe given diameter and velocity.
Septic Tank Size Calculator — Recommended septic tank size based on number of bedrooms.
Water Pressure Calculator (Elevation Effect) — Static water pressure loss or gain due to elevation change.
Gutter Downspout Sizing Calculator — Minimum downspout size needed for a given roof drainage area.
Sump Pump Sizing Calculator — Minimum sump pump capacity (GPM) needed for a basin.
Toilet Water Usage & Savings Calculator — Annual water and cost savings from upgrading to a low-flow toilet.

HVAC & Insulation (9)

AC/BTU Room Sizing Calculator — Recommended air conditioner BTU capacity for a room.
Insulation R-Value Calculator — Total combined R-value of multiple insulation layers.
Duct Sizing Calculator — Round duct diameter needed for a given airflow (CFM).
Heating Load Estimator — Rough heating BTU/hr requirement based on area and climate factor.
Attic Ventilation Calculator — Required net free area of attic vents based on attic floor area.
Furnace Sizing Calculator — Recommended furnace BTU output for a home\u2019s square footage and climate.
Whole-House Humidifier Sizing Calculator — Recommended humidifier capacity (gallons/day) for a home\u2019s size.
Ceiling Fan Size Calculator — Recommended ceiling fan blade span for a room.
Insulation Batts Needed Calculator — Number of insulation batts needed for a wall or attic area.

Landscaping & Outdoor (12)

Mulch Calculator — Cubic yards and bags of mulch needed for a garden bed.
Topsoil Calculator — Cubic yards of topsoil needed for a garden bed or lawn area.
Sod & Grass Seed Calculator — Sod pallets or grass seed needed for a lawn area.
Retaining Wall Block Calculator — Number of retaining wall blocks needed for a wall.
Paver Calculator — Number of pavers needed for a patio or walkway.
Pool Volume Calculator — Water volume of a rectangular swimming pool.
Sprinkler Coverage Calculator — Number of sprinkler heads needed for a lawn area.
Firewood (Cord) Calculator — How many cords of firewood a stacked pile represents.
Gravel Driveway Calculator — Gravel volume and tonnage needed for a driveway.
Fence Post Concrete Calculator — Bags of concrete needed to set fence posts.
Artificial Turf Calculator — Square footage and rolls of artificial turf needed for a yard.
Paver Base Gravel Calculator — Gravel base volume needed underneath a paver patio or walkway.

Windows & Doors (6)

Window Heat Loss Calculator — Estimated heat loss through a window based on its U-factor and temperature difference.
Door Swing Clearance Calculator — Floor space needed for a door to swing open fully.
Trim/Casing Calculator — Linear feet of casing trim needed for a set of doors and windows.
Egress Window Size Checker — Checks whether a window meets standard minimum egress size requirements.
Weatherstripping Calculator — Linear feet of weatherstripping needed for doors and windows.
Closet Rod & Shelf Calculator — Linear feet of closet rod and shelving needed for a closet.

Project Cost & Planning (9)

Contractor Markup Calculator — Customer price from job cost and desired markup percentage.
Home Renovation Budget Calculator — Budget breakdown for a renovation project by category percentage.
Cost Per Square Foot Calculator — Project cost per square foot, or total cost from a per-sq-ft rate.
Labor Cost Estimator — Total labor cost from crew size, hours, and hourly rate.
Material Waste Percentage Calculator — How much extra material to order to cover typical installation waste.
Demolition Cost Estimator — Estimated demolition cost from area and per-sq-ft demolition rate.
Building Permit Cost Estimator — Rough permit fee estimate as a percentage of total project value.
Home Renovation ROI Calculator — Estimated return on investment for a home improvement project.
Change Order Cost Calculator — Cost impact of a mid-project scope change, including markup.