Construction & DIY Calculators

Work out how much concrete a slab, footing or pad needs — in cubic yards, cubic metres and whole bags.

Calculate the gravel, aggregate or crushed stone needed for a driveway, path or base layer, by volume and weight.

Calculate how much sand a job needs by volume and weight, for bedding, backfill or a sandpit.

Calculate how many rolls of turf or pieces of sod a lawn needs, with a trimming allowance and cost.

Work out how many bags or cubic yards of mulch, bark or compost a garden bed needs.

Calculate how many tiles a floor or wall needs, including cuts and breakage, plus the cost.

Work out how much paint a room or wall needs, for any number of coats, plus the cost.

Add up the total square footage of a house, apartment or floor plan from several rooms at once, with the cost at any price per square foot.

Work out how many drywall sheets a wall or ceiling needs, plus screws, joint compound and cost.

Work out the R-value of an insulation layer, the thickness needed to hit a target R-value, and the total for a layered assembly.

Estimate carpet area and cost for a room, with a waste allowance for cuts and seams.

Work out how many rolls of wallpaper a room needs, with a pattern-repeat allowance and cost.

Estimate roofing squares, bundles and material cost from the roof footprint and its pitch.

Work out posts, rails and pickets for a fence from the run length, post spacing and picket width, with total material cost.

Work out how many pavers or slabs a patio or path needs, with a cutting allowance and cost.

Work out deck boards, joists, beams and fasteners from the deck size, board width and gap, with butt joints and cost.

Calculate the number of steps, exact riser height, total run and stringer length for a staircase from the total rise.

Calculate board feet for lumber from thickness, width, length and quantity — with nominal and actual sizes compared, and total cost.

Work out how many bricks a wall needs from its area, the brick size and the mortar joint, with mortar volume and cost.

Work out how many rebar bars a slab or footing needs, with lap splices, total linear feet, weight by bar size and cost.

Work out excavation volume in bank and loose cubic yards, allowing for soil swell, with truck loads, haul weight and cost.

Work out the ramp length a given rise needs, check it against the ADA 1:12 slope limit, and count the intermediate landings required.