Construction Calculators
Free calculators for concrete, tile, brick, drywall, paint, roofing, insulation and electrical planning.
Baseboard Calculator
Calculate net wall length, cutting allowance and whole baseboard pieces after subtracting doorways.
Bathroom Tile Calculator
Calculate combined floor and wall area and the number of tiles for a bathroom from room size, door area and tile dimensions.
Brick and Block Calculator
Estimate bricks or blocks for a rectangular wall from unit dimensions, mortar joints and waste. Calculate openings separately.
Carpet Calculator
Calculate room area, the number of carpet strips and the linear roll length needed for installation.
Concrete Calculator
Calculate concrete volume, order quantity and dry-mix bags from slab dimensions.
Crushed Stone Calculator
Estimate crushed stone volume and tonnes for a compacted base using area, layer depth, density and allowance.
Decking Calculator
Calculate deck area, total board length and whole boards from deck size, board width, gap and stock length.
Drain Pipe Slope Calculator
Calculate total pipe fall and ending invert level from run length, starting level and selected slope percentage.
Drywall Calculator
Calculate drywall sheets and screws for a rectangular wall from its dimensions, sheet size and cutting allowance.
Excavation Calculator
Calculate in-place excavation volume and loose haul volume from dimensions and a selectable swell allowance.
Fence Material Calculator
Calculate fence sections, posts and horizontal rails from total length, post spacing and rails per section.
Fence Post Concrete Calculator
Estimate concrete volume and whole bags for round fence post holes after allowing for the post itself.
Floor Screed Calculator
Calculate screed area, dry-mix weight and whole bags from floor size, thickness and consumption rate.
French Drain Calculator
Estimate drainage gravel, perforated pipe length and filter fabric for a rectangular French drain trench.
Gravel Calculator
Calculate gravel volume and approximate tonnes from area, layer depth, bulk density and delivery allowance.
Gutter Calculator
Calculate gutter length with allowance, whole stock sections and a planning count of downspouts.
Heat Loss Calculator
Estimate design heat loss from heated floor area, a specific heat-loss coefficient, temperature difference and allowance.
Insulation Calculator
Calculate insulation area, material volume and full packs from surface size, thickness and pack coverage.
Laminate Flooring Calculator
Calculate laminate floor area, cutting allowance and the number of whole packs required for a room.
Lumber Volume Calculator
Calculate total linear length and solid timber volume from piece count, length, width and thickness.
Masonry Mortar Calculator
Estimate dry masonry mortar and whole bags from wall area, product consumption and site allowance.
Metal Roof Panel Calculator
Calculate the number of full-length metal roof panels, total panel length and covered area for one roof slope.
Mulch Calculator
Calculate mulch volume and approximate bulk weight from bed dimensions, spreading depth and waste allowance.
Paint Calculator
Calculate paint and primer for a rectangular wall from its dimensions, coats, coverage and waste allowance.
Paver Base Calculator
Calculate compacted base aggregate and bedding sand volumes for a paved patio, drive or path.
Paver Calculator
Calculate paved area, cutting allowance and whole pavers from project dimensions and individual paver size.
Plywood Sheet Calculator
Calculate covered area and whole plywood or OSB sheets from project dimensions, sheet size and cutting allowance.
Radiator Output Calculator
Calculate required nominal heating output and radiator or section count using room heat loss and correction factor.
Rafter Length Calculator
Calculate common rafter length and rise to ridge from building span, roof angle and horizontal overhang.
Ramp Length Calculator
Calculate required horizontal ramp length and slope percentage from vertical rise and a selected slope ratio.
Rebar Calculator
Calculate reinforcement length with lap allowance, whole stock bars and approximate steel weight.
Roof Pitch Calculator
Convert roof rise and horizontal run into angle, percentage slope and roof area multiplication factor.
Roof Shingle Calculator
Calculate sloped roof area, cutting allowance and whole shingle bundles from footprint and coverage.
Roofing Calculator
Calculate sloped roof area with waste allowance from footprint dimensions and roof pitch.
Sand Calculator
Estimate sand volume and mass for bedding, filling or landscaping from dimensions, depth and bulk density.
Self-Leveling Compound Calculator
Estimate self-leveling compound weight and whole bags from floor area, average depth and label consumption.
Siding Calculator
Calculate net facade area, installation allowance and whole siding panels after subtracting openings.
Slab Foundation Calculator
Calculate main slab, additional thickened edge and total concrete volume with an ordering allowance.
Stair Calculator
Calculate the number of risers, actual riser height and tread depth from total rise and available run.
Strip Foundation Calculator
Calculate concrete volume with ordering allowance for continuous strip footings from total length, width and depth.
Tile Adhesive Calculator
Estimate tile adhesive weight and whole bags from tiled area, product consumption and waste allowance.
Tile Calculator
Estimate tile quantity and full boxes from surface size, tile dimensions and cutting waste.
Topsoil Calculator
Calculate topsoil volume and approximate weight for lawns, beds and grading from area, depth and density.
Vinyl Plank Flooring Calculator
Estimate vinyl plank flooring area, fitting waste and whole packs from the room dimensions.
Voltage Drop Calculator
Estimate current and voltage drop for a simple single-phase copper circuit.
Wall Plaster Calculator
Estimate dry plaster weight and whole bags from wall size, layer thickness and product consumption.
Wall Putty Calculator
Estimate finishing putty weight and whole bags from surface area, coat thickness and label consumption.
Wall Stud Calculator
Calculate regular wall studs plus additional framing at door and window openings, corners and wall ends.
Wallpaper Calculator
Calculate wallpaper drops and whole rolls from wall perimeter, ceiling height, openings and pattern repeat.
Construction Calculators
Free calculators for concrete, tile, brick, drywall, paint, roofing, insulation and electrical planning.
Open a tool, enter your measured dimensions, then save an estimate. Keep another version if you want to compare products or allowances.