Construction Calculators

Turn measurements into real material estimates — concrete, gravel, paint, tile, drywall, lumber, and more — so you buy the right amount the first time. Each calculator works out the bags, yards, gallons, or sheets instantly and keeps your project details private.

Concrete Calculator Free concrete calculator. Enter length, width and depth to get cubic feet, cubic yards and the number of 80 lb or 60 lb concrete bags you need, with waste allowance.

Gravel Calculator Free gravel, sand and mulch calculator. Enter area and depth to get cubic feet, cubic yards, tons and the number of bags you need — for any landscaping material.

Paint Calculator Free paint calculator. Enter room size to get the gallons, quarts and litres of paint you need for your walls and ceiling, accounting for doors, windows and coats.

Tile Calculator Free tile calculator. Enter room and tile size to get the number of tiles, boxes, grout and thinset you need, with waste allowance and grout gap built in.

Drywall Calculator Free drywall calculator. Enter wall area to get the number of drywall sheets you need for 4×8, 4×10 or 4×12 boards, plus joint compound, tape and screws.

Lumber Calculator Free lumber calculator. Work out board feet for any board size and quantity, plus framing stud count from wall length and on-center spacing.

Roofing Calculator Free roofing calculator. Enter the building footprint and roof pitch to get roofing squares, shingle bundles, underlayment rolls, nails and ridge cap for asphalt shingle roofs.

Fence Calculator Free fence calculator. Enter fence length, post spacing, height and picket size to get the number of posts, pickets, rails and bags of concrete for a wood privacy or picket fence.

Stair Calculator Free stair calculator. Enter total rise and target riser height to get the number of risers and treads, riser height, run, stringer length and stair angle for a code-compliant staircase.

Paver Calculator Free paver calculator. Enter patio or driveway area and paver size to get the number of pavers needed, plus base, sand and edge restraint material with a waste allowance.

Block Calculator Free concrete block calculator. Enter wall size and block dimensions to get the number of CMU blocks, bags of mortar, and fill material for a concrete masonry wall.

Rebar Calculator Free rebar calculator. Enter slab size, bar spacing and size to get the number of rebar pieces, linear feet, weight in pounds, and ties for a reinforced concrete slab.

AC Tonnage Calculator Free AC tonnage calculator. Enter room size, sun exposure and kitchen to get the cooling capacity in BTU, tons and kW for the right air conditioner or mini-split size.

Decking Calculator Free decking calculator. Enter deck size and board dimensions to get the number of deck boards, linear feet, joists and screws needed to build a wood or composite deck.

Flooring Calculator Free flooring calculator. Enter room size and box coverage to get the number of boxes of flooring, underlayment rolls and transition strips with a waste allowance.

Generator Wattage Calculator Free generator wattage calculator. Tick the appliances you want to run to get the running and starting watts and the recommended generator size in watts and kilowatts.

Tire Size Calculator Free tire size calculator. Enter the tire width, aspect ratio and rim size to get the overall diameter, circumference, revolutions per mile and sidewall height.

Wheel Offset Calculator Free wheel offset calculator. Compare stock and new wheel width and offset to see how far the wheel moves outward and inward and whether it clears the fender.

Fuel Cost Calculator Free fuel cost calculator. Enter trip distance, your car's MPG and the fuel price to get the total trip cost, gallons needed, liters and cost per mile.

Belt Size Calculator Free belt size calculator. Enter two pulley diameters and the center-to-center distance to get the V-belt or drive belt length in inches and feet, plus wrap angles.

Tank Volume Calculator Free tank volume calculator. Find the capacity in gallons and litres of a cylindrical, rectangular or capsule tank from its dimensions. For fuel, water and storage tanks.

Pipe Volume Calculator Free pipe volume calculator. Enter inner diameter and length to get the water volume in gallons per foot, total gallons, litres and water weight for any pipe.

Pool Calculator Free pool calculator. Work out pool volume in gallons and litres for a rectangular or round pool, plus chlorine, alkalinity and calcium dosage estimates.

French Drain Calculator Free french drain calculator. Enter trench length, width and depth to get the gravel you need in cubic yards and tons, plus drain pipe length and fabric.

Wallpaper Calculator Free wallpaper calculator. Enter wall width, height and pattern repeat to get the number of rolls and strips you need, accounting for doors and windows.

Insulation Calculator Free insulation calculator. Enter the area and target R-value to get the required insulation thickness for fiberglass, rock wool, cellulose or spray foam, plus bundle count.

Deck Stain Calculator Free deck stain calculator. Enter deck size, railing and stain type to get the gallons and quarts of stain you need for the right number of coats.