Construction Calculators
Materials, areas, volumes and site quantities for building work.
- 3-Phase Power Calculator Calculate three-phase power in kW, kVA and kVAR from voltage, current and power factor, or the current drawn by a three-phase load.
- Aggregate Calculator Convert an amount of gravel, sand, stone or other aggregate between cubic yards, US tons, cubic metres and tonnes using its typical density.
- Asphalt Millings Calculator Work out the tons of recycled asphalt millings for a driveway or lot from the compacted depth, and compare the cost with new hot-mix asphalt.
- Asphalt Tonnage Calculator Work out how many tons of hot-mix asphalt you need from the area and compacted thickness, with the spread rate, truckloads and material cost.
- Barndominium Cost Calculator Estimate the cost to build a barndominium from the living area, shop space, finish level and site work, with the total and cost per square foot.
- Baseboard Calculator How many lengths of baseboard or skirting to buy for a room, from its perimeter less the doors, with corners and finishing nails counted.
- Bathroom Remodel Calculator Estimate the cost of a bathroom remodel from its size and finish level, with plumbing changes, a contingency and the typical labour share.
- Blacktop Calculator Estimate the cost of a blacktop driveway or pad, adding the asphalt, the stone base and labour, with the total and the price per square foot.
- Block Calculator Concrete blocks for a wall from its area less openings, counted with their mortar joints, with courses and total weight — UK blocks or US CMU.
- Block Wall Calculator Lay out a concrete block wall course by course: courses, full and half blocks for running bond, cap blocks, mortar bags and footing concrete.
- Brick Calculator Bricks for a wall from its area less openings, counting the mortar joint each brick includes — the detail that turns 72 bricks per square metre into 60.
- Carpet Calculator How much carpet to buy from a 4 m, 5 m or 12 ft roll, laying it the way that wastes least, with seams, trim allowance and cost.
- Ceiling Tiles Calculator Work out the tiles and grid for a drop ceiling: 2×2 or 2×4 tiles, main tees, cross tees, wall angle and hanger wires for your room.
- Cinder Block Wall Calculator Count the cinder blocks for a wall, with openings and waste, and get the total weight, pallets to order and the cost of the blocks.
- Concrete Block Wall Calculator Work out the grout and rebar for a reinforced 8 in concrete block wall: grouted cells or solid grouting, bond beam and the bars to order.
- Concrete Calculator Concrete for slabs, columns and steps in cubic yards or cubic metres, with the ready-mix order to place and the number of premix bags as an alternative.
- Concrete Footing Calculator Concrete for strip footings under walls or pad footings under posts, with the order, bags, and proportions checked against common rules of thumb.
- Concrete Slab Calculator Concrete for a slab from its size and thickness, with waste, the ready-mix order, bags, optional cost, and what an extra inch of thickness would add.
- Countertop Square Footage Calculator Add up countertop square footage for up to three sections, including an island and backsplash, with the cost and number of stone slabs.
- Crushed Concrete Calculator Work out the tons of recycled crushed concrete for a base or driveway and compare its cost with virgin crushed stone for the same area.
- Crusher Run Calculator Work out the tons of crusher run for a compacted base, allowing for compaction, with the loose depth to spread and the number of lifts.
- Deck Board Calculator How many deck boards to buy, rows across the deck, and screws or hidden clips, from the deck size, board width, gap and length.
- Deck Calculator Framing take-off for a deck: joists, hangers, ledger, rim, beam, posts and footing concrete, from the deck size and spacings.
- Deck Footing Calculator Size deck footings from the load each post carries and the soil bearing capacity, with the concrete volume and bags for every footing.
- Deck Joist Calculator Count the deck joists you need for a given deck length and spacing, and check the joist span against IRC limits for 2×6 to 2×12 lumber.
- Deck Post Spacing Calculator Work out how many deck posts each beam needs and how far apart to set them, with cantilever checks and the total post count.
- Dirt Calculator Find how many cubic yards of dirt you need for an area and depth, with the weight, dump-truck loads and the delivered cost.
- Dirt Volume Calculator Find the volume of dirt in a pit, round hole, trench, cone-shaped pile or berm, in bank yards and loose yards after digging.
- Drywall Calculator Sheets of drywall or plasterboard for a room's walls and ceiling, less openings, with waste, screws and how many sheets other sizes would take.
- Electrical Load Calculator Estimate a home's electrical load and service size with the NEC 220.82 optional method: floor area, appliances and heating or cooling.
- Excavation Calculator Soil to dig out for a foundation, pond or trench: in-ground volume, loose volume after swell, truckloads or skips, weight and removal cost.
- Fault Current Calculator Estimate available short-circuit current at a transformer and at the end of a conductor run using the point-to-point method.
- Fence Calculator Posts, rails, boards and post-hole concrete for a wooden fence, from its length, height, post spacing, gates and board size.
- Fence Post Depth Calculator Find how deep to set fence posts from the fence height, frost depth, post type and soil, with the hole size and the post length to buy.
- Fill Dirt Calculator Work out how much loose fill dirt to order to raise the ground by a compacted height, allowing for shrinkage, with truckloads and lifts.
- Flooring Calculator Boxes of wood, vinyl or laminate flooring for a room — including L-shaped rooms — with waste set by the laying pattern and underlay rolls.
- Friction Loss Calculator Calculate water friction loss in a pipe with the Hazen–Williams formula from flow, inside diameter, length and pipe material, with head and velocity.
- Gravel Calculator Gravel for a path, driveway or border from its size and depth: tons or tonnes, cubic yards or m³, bags, bulk bags and optional cost.
- Grout Calculator Grout for a tiled area from the tile size, thickness and joint width, using the manufacturers' formula — and why small tiles use so much more.
- Gutter Fall Calculator Check an existing gutter from its measured fall: slope per 10 ft, percent and degrees, whether it drains properly and the drop it should have.
- Gutter Installation Cost Calculator Estimate the cost of installing gutters by material and length, with downspouts, gutter guards and removal of old gutters.
- Gutter Slope Calculator Set out the drop for a new gutter run: total fall at your chosen slope, chalk-line layout, split runs over 40 ft and the number of hangers.
- Hardwood Floor Calculator Cartons of solid hardwood flooring with waste set by grade and pattern, plus a moisture check between the boards and the subfloor.
- Heat Pump Cost Calculator Estimate the size and installed cost of a heat pump from your home's area and system type, with rebates and payback against a conventional system.
- Home Addition Cost Calculator Estimate the cost of a home addition from its size and type, a room addition, second storey, sunroom or garage, with design, permits and contingency.
- Insulation Calculator How thick insulation must be to reach a target R-value, in US or SI units, for common materials, with the amount to buy and the resulting U-value.
- Laminate Flooring Calculator Planks and packs of laminate for a room, plus a row plan that shows how wide the last row will be and when to rip the first row.
- Landscape Material Calculator Get quantities of mulch, topsoil, compost, decorative gravel and paver sand for one area at once, in cubic yards, tons and retail bags.
- Limestone Calculator Work out how many tons of crushed limestone you need by grade, #57, #411, #3 or screenings, with truckloads and cost for driveways and bases.
- LVL Span Calculator Estimate how far a 1¾ in LVL beam can span for its depth, number of plies and the floor load it carries, with bending, shear and deflection checks.
- Material Calculator Work out the volume and weight of any bulk material, from gravel and sand to mulch and concrete, for an area and depth, or with your own density.
- Mortar Calculator Mortar for brick or block walls from the wall area, with the cement bags and sand to buy at your mix ratio — allowing for dry materials shrinking when mixed.
- Mulch Calculator Mulch for beds and borders from the area and depth: cubic yards or m³ with settling, bags, bulk bags, coverage and optional cost.
- Paint Calculator Paint for a room's walls and ceiling from its size, coats and the paint's coverage, rounded to the cans you can actually buy.
- Pavement Calculator Find how far a load of asphalt will pave at your width and thickness, using the spread rate in pounds per square yard, and the yield per ton.
- Pea Gravel Calculator Work out how much pea gravel you need and whether buying 0.5 cubic foot bags or a bulk delivery by the ton is cheaper for your project.
- Plaster Calculator Bags of plaster for a wall or ceiling from the area, coat thickness and product coverage, for finish skims and undercoats alike.
- Pond Calculator Work out a garden pond's water volume in gallons, the pump size for your turnover time and the liner size from its dimensions and depth.
- Pond Size Calculator Work out how big a pond your koi or goldfish need: minimum gallons, surface area at your depth and pond dimensions to dig.
- Post Hole Concrete Calculator Concrete for fence and deck post holes, less the volume the post itself fills, in bags per hole and in total, with sizing rules of thumb.
- Primer Calculator Primer or a mist coat for a room from its size and the surface, which sets how far a litre goes — with the water to add for a mist coat on new plaster.
- Rafter Dimensions Calculator Work out rafter cut angles and birdsmouth dimensions from the pitch and rafter size: plumb and seat cuts, heel depth, height above plate and line length.
- Rafter Length Calculator Common rafter length from the building span, roof pitch, overhang and ridge board, with the stock length to buy and the plumb cut angle.
- Rebar Calculator Bars, total length, laps and weight for a reinforcing grid in a slab or footing, in US bar sizes or metric — with bars counted as spaces plus one.
- Recessed Lighting Calculator Work out how many recessed lights a room needs from its size, its use and the lumens of each fixture, with the total lumens and watts.
- Recessed Lighting Layout Calculator Lay out recessed lights in an even grid from the room size and ceiling height: rows, columns, spacing and the distance from each wall.
- Rip Rap Calculator Estimate the tons of rip rap stone to armour a bank or shoreline from its length, height and slope, with the layer thickness set by stone size.
- River Rock Calculator Find the tons of river rock for a landscape bed by stone size, with the right depth for each size, coverage per ton, bags and fabric.
- Rock Calculator Estimate the weight of a boulder or landscape rock from its size, shape and rock type, and see what equipment you need to move it.
- Roof Pitch Calculator Convert a roof’s rise and run, or its angle, into pitch in 12, degrees, percent grade and pitch factor, with what the slope suits.
- Roofing Calculator The area of a roof in square feet, square metres and roofing squares, from the building footprint, overhang and pitch, with waste by roof shape.
- Sand Calculator Sand for paver bedding, a pool base or a sandpit from the area and depth: tons or tonnes, cubic yards or m³, bags and optional cost.
- Septic System Size Calculator Size a septic drain field from bedrooms and the perc test rate: absorption area in square feet, trench length and the number of trenches.
- Septic Tank Size Calculator Find the septic tank size you need in gallons from the number of bedrooms, with garbage disposal sizing and a pumping interval estimate.
- Shingle Calculator Bundles of asphalt shingles for a roof, plus hip and ridge cap, starter strip and roofing nails, from the roof area and edge lengths.
- Soffit Calculator Work out the soffit panels and J-channel for your eaves, and how much vented soffit gives enough attic intake air under the 1/300 rule.
- Soil Yard Calculator Convert bags of soil to cubic yards or yards to bags for any bag size, and compare the cost of bagged soil with bulk soil by the yard.
- Spray Foam Insulation Calculator Work out the board feet of open-cell or closed-cell spray foam to reach a target R-value, with thickness, kits to buy and installed cost.
- Stair Calculator Number of risers and treads, riser height, total run, stringer length and angle for a straight stair, with a comfort and code check.
- Stud Calculator Studs and plates for a framed wall at 16 or 24 in or metric centres, counted as spaces plus one, with extras for corners and openings.
- Subcooling Calculator Calculate HVAC subcooling from liquid line pressure and temperature for R-410A, R-22 or R-134a, and compare it with the target charge.
- Superheat Calculator Calculate HVAC superheat from suction pressure and suction line temperature for R-410A, R-22 or R-134a, with a fixed-orifice target.
- Tile Calculator Tiles and boxes for a floor or wall from the area and tile size, counted with the grout joint and a waste allowance set by the layout pattern.
- Topsoil Calculator Topsoil for a lawn or garden bed from the area and depth: cubic yards or m³ with settling included, the weight, bags, bulk bags and optional cost.
- Wainscoting Calculator Work out the panels or boards for wainscoting around a room, less doors, with chair rail and baseboard trim, at a height you choose.
- Wallpaper Calculator Rolls of wallpaper for a room counted by full-height drops, with the pattern repeat included — the detail that area-based estimates miss.
- Well Drilling Cost Calculator Estimate the cost of drilling a water well from its depth and price per foot, with casing, pump system, permit and water testing.
- Wire Calculator Find the copper or aluminum wire size for a circuit from its amps, length and voltage, checking ampacity and keeping voltage drop within limits.
- Yards of Gravel Calculator Find how many cubic yards of gravel a rectangle, circle or triangle needs, with the order size, wheelbarrow loads and pickup trips.