Home & Garden Calculators
Concrete, gravel, stairs, fences and pools — material estimates for real projects.
Concrete CalculatorConcrete calculator for slabs, footings and round columns. Get cubic yards or meters plus 60 lb and 80 lb bag counts, rounded up so you never come up short.Deck CalculatorPlan a deck build: enter length, width, board size and joist spacing to get square footage, deck boards, joists, beam lines, posts and a rough fastener count.Drywall CalculatorWork out drywall sheets, screws, joint compound and joint tape for a room from its dimensions, doors and windows, and sheet size, with 10% waste built in.Fence CalculatorFind how many fence posts, pickets and horizontal rails a fence needs from its length, post spacing and picket size, including the classic fencepost count.Grass Seed CalculatorFind how much grass seed a new lawn or overseeding job needs from its area and grass type, using published university extension seeding rate ranges.Gravel CalculatorWork out how much gravel a driveway or path needs in cubic yards or meters and tons, from area and depth. Adjust the density field for your specific material.BTU Calculator (AC & Heating Sizing)Estimate cooling and heating BTU/hr from room area, ceiling height, sun exposure, room type and occupants, using a published ~20 BTU per sq ft rule of thumb.Board Foot CalculatorCalculate board feet from thickness, width and length in quarters or inches, then multiply by quantity and price per board foot for a total lumber cost.Pool Volume CalculatorCalculate pool volume in gallons, liters and cubic meters for rectangular, round and oval pools, using the exact 7.48052 gallons per cubic foot conversion.Roof Pitch CalculatorFind roof pitch as x/12, angle in degrees and slope percentage from rise and run, or work backward from an angle. Includes rafter length with overhang.Roofing Shingle CalculatorEstimate roofing squares, shingle bundles, nails, underlayment rolls and ridge cap from roof footprint and pitch, using the standard pitch-multiplier table.Soil CalculatorCalculate soil volume for rectangular or round garden beds in cubic feet, yards and meters, plus bag counts and an estimated weight at a typical density.Solar Panel Payback CalculatorEstimate solar panel payback in years from system cost, incentives, system size, production, electricity price, price inflation and panel degradation.Square Footage CalculatorCalculate square footage for a rectangle, circle or triangle, or add up multiple room sections. Get total square feet or meters plus an estimated cost.Stair CalculatorWork out how many stair risers you need, the exact riser height, total run and stringer length from total rise, using a common US residential riser limit.Wallpaper CalculatorCalculate how many wallpaper strips and rolls a room needs from wall perimeter, height, and US or European roll sizes, including pattern repeat waste.Water Heater Size CalculatorSize a storage tank water heater using the DOE first-hour rating method, or find the GPM a tankless unit needs from simultaneous fixture flow rates.