How much do you need?

Concrete

• Concrete CalculatorCubic yards and 40/60/80 lb bag counts for slabs, footings and posts.

Roofing and stairs

• Roofing CalculatorRoof area, squares and shingle bundles from footprint and pitch.
• Stair CalculatorNumber of steps, riser height, run and stringer length.

Paint and drywall

• Paint CalculatorGallons and quarts of paint and primer for any room.
• Drywall CalculatorSheets of drywall, joint compound and screws for any room.

Yard, garden and pool

• Gravel CalculatorCubic yards and tons of gravel, stone or sand for any area.
• Mulch CalculatorCubic yards or 2 and 3 cu ft bags for any bed size and depth.
• Topsoil CalculatorCubic yards, tons and bags of topsoil or fill dirt.
• Pool Volume CalculatorGallons and liters for rectangular, round and oval pools.

Area and volume

• Square Footage CalculatorSquare feet of any room, yard or lot, area by area.
• Cubic Yard CalculatorLength, width and depth to cubic yards, feet and meters.

Why trust these numbers

Every default comes from a published source: manufacturer data sheets for bag yields, university extension guides for depths, and NIST for unit conversions. Each calculator lists its sources and shows the formula, so you can check the math yourself. Read how we calculate.