Home & Garden calculators
Ordering too little material stalls a project, and ordering too much wastes money and leaves you with leftovers to return. These calculators turn your measurements into quantities you can buy: bags of concrete, gallons of paint, boxes of flooring, cubic yards of mulch.
Each page shows how the quantity was worked out and suggests a waste allowance for cuts and spills. Coverage varies by product, so check the label or the supplier's figures before you place the order.
See all 100 dances →
- Concrete CalculatorEstimate the cubic yards or cubic meters of concrete, the premix bags and the cost for a slab, footing, round column, hollow tube or set of post holes.
- Gravel CalculatorFind out how many cubic yards, tons or bags of gravel you need for a rectangle or circle at any depth, and what it will cost.
- Mulch CalculatorFind out how much mulch your garden bed needs at the depth you want, in cubic yards, cubic meters or bags. See the cost bagged or in bulk.
- Paint CalculatorFind out how much wall and ceiling paint to buy, after doors and windows, for any number of coats. It rounds up to whole cans and shows the cost.
- Roofing CalculatorFind your roof's real area from the house's size and roof pitch. Then see how many squares and shingle bundles to buy, plus an optional cost.
- Square Footage CalculatorFind the square feet of a room or yard by adding up to six rectangles, triangles or circles. Add extra for waste and see the cost.
- Board Foot CalculatorFind the board feet in a stack of lumber from its thickness, width, length and piece count, and what it costs at a price per board foot.
- Cubic Yard CalculatorFind how many cubic yards, cubic feet or cubic meters fill a space. Use length, width and depth in any mix of units, or an area and a depth.
- Drywall CalculatorFind how many drywall sheets a room's walls and ceiling need after doors and windows, plus typical amounts of screws and joint compound.
- Fence CalculatorEstimate posts, rails, pickets and bags of concrete for a fence run, with a rule-of-thumb post depth and an optional material cost.
- Flooring CalculatorWork out how many boxes of laminate, hardwood or vinyl plank flooring to buy for one or more rooms, with a waste allowance and the cost.
- Pool Chlorine CalculatorFind out how much liquid chlorine, cal-hypo, dichlor or trichlor to add to bring your pool's free chlorine up to the level you want.
- Stair CalculatorLay out a straight stair from its total rise: number of risers and treads, riser height, tread depth, total run, stringer length and angle.
- Tile CalculatorFind how many tiles and boxes to buy for a floor or wall, from the tile size, the grout gap and a little extra for waste.
- Asphalt CalculatorEstimate the tons of hot-mix asphalt needed for a driveway or lot from its size, thickness and density.
- Brick CalculatorFind how many bricks a wall needs from its size, the brick size and the mortar joint, with extra for waste, plus the mortar and premixed mortar bags.
- Carpet CalculatorFind how much carpet and pad to buy for one or more rooms from their sizes and the roll width, including seams, leftover pieces and cost.
- Concrete Block CalculatorCount the concrete blocks (CMU) a wall needs from its size, the block size and any openings, with extra for breakage and an estimate of mortar bags.
- Decking CalculatorEstimate deck boards, linear feet, joists and screws or hidden clips for a rectangular deck from its size, board width, gap and joist spacing.
- Epoxy Resin CalculatorEstimate the epoxy for a tabletop coating, a round pour or a river table, split into resin and hardener by your mix ratio.
- Excavation CalculatorEstimate how much soil a dig removes, in place and once loosened by swell, and how many truckloads it takes to haul away.
- Fertilizer CalculatorWork out how much N-P-K fertilizer to spread so an area gets a target amount of nitrogen, phosphate or potash.
- Generator Size CalculatorFind the backup or portable generator size you need from the running and starting watts of the appliances you want on at once.
- Grass Seed CalculatorWork out how much grass seed to buy for a new lawn or for overseeding. It uses your lawn area and the seeding rate on the label.
- Grout CalculatorFind out how much grout your tiled floor or wall needs, in pounds or kilograms and bags, from the tile size, joint width, joint depth and area.
- Insulation CalculatorFind how many inches of insulation to add over what you have to reach a target R-value, and how many bags, batts, boards or foam kits to buy.
- Paver CalculatorFind how many pavers to buy for a patio, path or driveway, with extra for cuts, plus the base gravel and bedding sand you need.
- Plant Spacing CalculatorFind how many plants fit in your garden bed at the spacing on the seed packet. Lay them out in a square grid or in staggered, triangular rows.
- Pool Volume CalculatorFind how many gallons or liters of water a rectangular, round, oval or kidney-shaped pool holds.
- Raised Bed Soil CalculatorFind how much soil fills one or more raised beds or planters, in cubic feet, cubic yards, liters and bags.
- Ramp Slope CalculatorFind how long a ramp needs to be for its height and slope. Or check the slope of a ramp that fits your space, with its length, angle and landings.
- Rebar CalculatorEstimate a slab's rebar grid: the bars each way, the total length including lap splices, the stock bars to buy and the weight for US bar sizes #3 to #8.
- Retaining Wall CalculatorCount the blocks, cap stones and gravel you need for a block retaining wall, from its length, height and block size.
- Roof Pitch CalculatorTurn a roof's pitch into an angle or slope percentage, or back again, and find the rafter length and roof area multiplier for a gable roof.
- Sand CalculatorFind out how much sand to buy for an area and depth: its volume, its weight and how many bags that is.
- Sheathing CalculatorCount the plywood or OSB sheets you need to cover walls, a floor or a gable roof, allowing for the roof's pitch and cutting waste.
- Siding CalculatorFind how much siding to order for your house's walls and gable ends, after doors and windows. You get squares with a waste allowance, plus a box count.
- Sod CalculatorCount the sod pieces or turf rolls and pallets needed to cover a lawn, with an allowance for cutting and waste.
- Tank Volume CalculatorFind how much a tank holds and how much liquid is in it now, for upright or horizontal cylinders, box-shaped tanks and spheres.
- Topsoil CalculatorWork out how much topsoil to order for a lawn, bed or grading job in cubic yards or cubic meters, with bag counts and an approximate weight.
- Trim and Baseboard CalculatorFind how many feet of baseboard or crown molding a room needs, minus door openings, and how many pieces of a given length to buy.
- Wall Framing CalculatorCount the studs, plate boards and header lumber for a framed wall from its length, height, stud spacing and openings.
- Wallpaper CalculatorWork out how many rolls of wallpaper to buy from wall size, openings, roll size and pattern repeat.