Construction & Home Project Calculators
Order the right amount the first time. Concrete, gravel and mulch by the yard; drywall sheets, flooring boxes and roofing squares; deck boards, fence posts and pavers; insulation R-values, room BTUs, paint and stair layouts.
34 calculators
Most used
- Concrete CalculatorWork out how much concrete a slab, footing, column, curb or set of steps needs, in cubic yards and in 40, 60 or 80 lb premix bags.
- Cubic Yards CalculatorTurn the dimensions of a bed, pad or excavation into cubic yards — the unit landscape and concrete suppliers sell by — with an optional cost estimate.
- Feet and Inches CalculatorDo tape-measure math with feet, inches and fractions of an inch, and get answers rounded to the nearest 1/16 inch plus decimal and metric equivalents.
- Square Footage CalculatorTotal the square footage of several rooms or shapes at once, add a waste allowance and estimate the cost at any price per square foot.
Materials & volume 13
- Asphalt CalculatorWork out how many tons of hot mix asphalt a driveway or parking area needs from its size and compacted thickness.
- Concrete CalculatorWork out how much concrete a slab, footing, column, curb or set of steps needs, in cubic yards and in 40, 60 or 80 lb premix bags.
- Cubic Feet CalculatorFind the volume of a box, room, container or cylinder in cubic feet from measurements in any unit, for one item or many.
- Cubic Yards CalculatorTurn the dimensions of a bed, pad or excavation into cubic yards — the unit landscape and concrete suppliers sell by — with an optional cost estimate.
- Gravel CalculatorFind how much gravel a path, patio, bed or driveway needs in tons and cubic yards, based on area, depth and the density of the stone.
- Mulch CalculatorWork out how many cubic yards or bags of mulch your beds need and whether bags or bulk delivery costs less.
- Mulch Coverage ChartA coverage chart for mulch bags and cubic yards at every common depth, plus a quick calculator for how far your own mulch will spread.
- Paint CalculatorEstimate the paint for a room or wall from its dimensions, minus doors and windows, for any number of coats and coverage rate.
- Rebar CalculatorCount the rebar for a slab grid — bars each way, stock lengths with lap splices, total weight, tie points and chairs.
- Road Base CalculatorFind how many tons of road base a driveway, parking pad or path needs once the extra material lost to compaction is included.
- Sand CalculatorFind how many tons, cubic yards or bags of sand a project needs from its area, depth and the sand's density.
- Tank Volume CalculatorFind the capacity of a cylindrical, rectangular, capsule or oval tank and how much liquid it holds at any fill depth, in gallons and liters.
- Topsoil CalculatorEstimate topsoil for a new lawn, garden bed or low spot in cubic yards, tons and bags, including extra for the way loose soil settles.
Measurement 5
- Board Foot CalculatorFind the board feet in a stack of lumber from its thickness, width and length, and price the order at any cost per board foot.
- Feet and Inches CalculatorDo tape-measure math with feet, inches and fractions of an inch, and get answers rounded to the nearest 1/16 inch plus decimal and metric equivalents.
- Square Footage CalculatorTotal the square footage of several rooms or shapes at once, add a waste allowance and estimate the cost at any price per square foot.
- Stair CalculatorPlan a staircase from its total rise — number of risers and treads, riser height, total run, stringer length and angle — checked against typical code limits.
- Tile CalculatorCalculate the tiles and boxes needed for a floor, wall or backsplash, allowing for grout joints, cuts and breakage.
Flooring, walls & roofing 6
- Carpet CalculatorFigure out how much carpet to buy off a 12 ft or 15 ft roll, including strip layout, seams, waste, pad and tack strip.
- Drywall CalculatorWork out how many sheets of drywall a room needs, with doors and windows subtracted, plus the joint compound, tape and screws to finish it.
- Flooring CalculatorTurn a room's size into boxes of laminate, vinyl plank or wood flooring, with a waste allowance, underlayment rolls and total cost.
- Roof Pitch CalculatorFind a roof's pitch from rise and run, or convert between x/12, degrees and percent slope, with pitch factor and rafter length.
- Roofing CalculatorMeasure a roof from the ground: footprint, overhang and pitch give the roof area, squares, shingle bundles and the trim materials to order.
- Wallpaper CalculatorCount the wallpaper rolls for a room or accent wall using the strip method, with pattern repeat, match type, doors and windows.
Decks, fences & landscaping 8
- Brick CalculatorEstimate the bricks and premixed mortar for a wall or veneer from its size, the brick type and joint, with waste and wall ties.
- Concrete Block CalculatorCount the concrete blocks for a wall from its length and height, with mortar bags, grout for rebar cells and a waste allowance.
- Deck CalculatorPlan the lumber for a rectangular deck: deck boards, joists, rim and ledger, hangers and screws from the deck size and spacing.
- Fence CalculatorCount the posts, rails, pickets and bags of concrete for a wood fence from its length, height, spacing, corners and gates.
- Grass Seed CalculatorFind how much grass seed to buy for a new lawn or overseeding, using typical seeding rates for 12 cool- and warm-season grasses.
- Paver CalculatorPlan a paver patio or walkway: how many pavers, plus the gravel base, bedding sand and joint sand underneath, and how deep to dig.
- Retaining Wall CalculatorEstimate the blocks, caps, leveling-pad gravel, drainage stone and drain pipe for a segmental block retaining wall.
- Sod CalculatorWork out how many square feet, pieces and pallets of sod a new lawn needs, with an allowance for cutting around edges.
Heating, cooling & insulation 2
Guides
- How Much Concrete Do I Need? Slabs, Footings and Post HolesMultiply length × width × thickness in feet and divide by 27 for cubic yards. Worked examples for slabs, driveways, footings and fence posts, plus bag counts.
- How Much Paint Do I Need? Walls, Ceilings, Trim and ExteriorsWall area minus openings, times coats, divided by coverage per gallon. A worked room example, ceilings, trim, primer, exteriors and buying tips.
- How to Calculate the Square Footage of a Room or HouseMultiply length by width for each rectangle, then add them up. Step-by-step methods for odd-shaped rooms, inches, waste factors and unit conversions.
- How to Calculate Stairs: Risers, Treads, Run and Stringer LengthDivide the total rise into equal risers under 7¾ inches, then work out treads, run and stringer length. A worked example checked against IRC limits.