Build it once. Buy it right.

Concrete Calculator

Pick a shape, enter its size, add more sections if the job has them, and get yards, bags and trucks with the math shown.

Concrete Slab Calculator

Enter the slab by length and width or by square feet, pick the thickness, and get yards, bags and a price range for your state.

Concrete Bag Calculator

Enter what you are pouring and get the number of bags in every size, the water to mix them and the weight to haul home.

Cinder Block Calculator

Enter a wall, foundation, steps or square feet and get concrete blocks (cinder, cement or CMU) by type, mortar bags, core fill grout and rebar.

Rebar Calculator

Pick what you are reinforcing, set the bar size and spacing, and get bars to buy, weight, laps and chairs with a drawing of the mat.

Stair Calculator

Enter the height from floor to floor and get risers, treads, run, stringer length and a to-scale drawing checked against the code.

Deck Calculator

For building a deck, not a card deck: enter its size and height to get boards, joists, beam, posts, footings, concrete and hardware, checked against the IRC.

Stair Stringer Calculator

Enter the total rise and stair width to get the framing square settings, cut marks, throat depth, board length and stringer count.

Deck Board Calculator

Enter the deck size, board and direction to get boards by length, butt joints over joists, screws or hidden clips and a board layout drawing.

Deck Joist Span Calculator

Pick lumber, joist size and spacing to see the allowable joist span, cantilever and beam span from the IRC deck tables, plus how many joists you need.

Board Foot Calculator

List your boards by thickness, width, length and count; get board feet, volume and cost.

Plywood Calculator

Get sheets of plywood or OSB for a floor, walls or roof, or lay out a cabinet cut list on 4 × 8 sheets.

Stud Calculator

Enter the wall length and height, spacing and openings to get every stud, plate and header drawn in place with a cut list.

Framing Calculator

Add each wall with its doors and windows to get studs, plates, sized headers, sheathing and nails in one material list.

Beam Span Calculator

Pick the wall, the load it carries, the building width and snow load to get the smallest header for your opening and the full span table.

Roof Pitch Calculator

Enter rise and run, or span and height, and get the pitch in every form, its multiplier and what roofing it can take.

Rafter Calculator

Enter span, pitch and overhang to get the rafter length, the cut angles, the birdsmouth and the board to buy, drawn to scale.

Roofing Calculator

Enter the house footprint, overhangs and pitch, or measured roof planes, and get the roof area in squares and a full shingle material list.

Shingle Calculator

Enter the roof in squares or square feet, pick the shingle, and get bundles, starter, hip and ridge cap and nails.

Siding Calculator

Measure the walls and gable ends, pick a siding, and get squares, pieces, trim and nails to order.

Drywall Calculator

Enter your rooms or square footage, pick the sheet size and get sheets, screws, mud, tape and a printable material list.

Paint Calculator

Enter the room (or one wall, or the square feet), coats and surface, and get gallons of wall, ceiling and trim paint in the cans to buy.

Wallpaper Calculator

Enter the walls, roll size and pattern repeat, and get strips per roll, strips to hang and the rolls to buy, laid out on your wall.

Insulation Calculator

Pick your state or climate zone and where you insulate, then get the target R-value, thickness and how many batts or bags to buy.

Board and Batten Calculator

Enter the wall, batten width and the gap you want, and get the exact even spacing, a drawing of the wall and the boards and nails to buy.

Tile Calculator

Add each floor and wall, pick the tile size and pattern, and get tiles, boxes, grout, thinset and a to-scale layout with the edge cuts.

Grout Calculator

Enter the tile size, thickness, joint width and area to get pounds of grout, bags or buckets, and whether your joint suits the grout.

Flooring Calculator

Enter your rooms and flooring, and get square feet, cartons with waste, underlayment rolls, quarter round and transitions.

Carpet Calculator

Enter your rooms, stairs and roll width, and get the cut list from the roll, square yards, seams, pad and tack strip.

Epoxy Calculator

Pick the project, enter its size and depth, and get the epoxy in gallons, liters and ounces with pours and kits.

Asphalt Calculator

Enter the area and compacted thickness to get tons of hot mix, cubic yards, trucks and cost, or cold patch bags for a repair.

Driveway Calculator

Pick asphalt, concrete or gravel, a 1-car or 2-car size and a shape, and get the material, the base stone and the installed cost.

Gravel Driveway Calculator

Enter the driveway size and the depth of each stone layer to get tons and loose cubic yards per layer, fabric, edging and the cost.

Asphalt Tonnage Calculator

Enter square yards and the lifts you will pave to get tons per lift, total tons and truckloads, with a lookup table for every thickness.

Driveway Sealer Calculator

Enter the driveway size, sealer type, condition and coats to get pails and gallons, crack filler for your cracks and the cost.

Voltage Drop Calculator

Enter the wire size, length, load and voltage to get volts dropped, percent drop, voltage at the load and the wire size that keeps it under 3%.

Conduit Fill Calculator

Add your wires or cables, pick the conduit and see the fill percentage, the smallest trade size that passes and a to-scale cross-section.

Wire Size Calculator

Enter the load, voltage and run length to get the minimum wire gauge by ampacity and by voltage drop; the larger of the two is the wire to buy.

Ohm's Law Calculator

Type any two values to get the other two, see which formulas were used on the wheel, and add up resistors in series or in parallel.

Electrical Load Calculator

Enter the floor area and your big appliances to get the calculated load in VA, the amps at 240 V and whether a 100, 150 or 200 A service covers it.

BTU Calculator

Enter the room, garage or shop size and how you use it, then get the BTUs to cool or heat it and the air conditioner or heater size to buy.

Ductwork Calculator

Enter the system size and your rooms with their duct runs to get the CFM, trunk and branch sizes, velocities and a material list.

CFM Calculator

Pick what you are sizing: a room's air changes, a system's tons, a duct's velocity, a bathroom fan or a range hood, and get the CFM.

AC Size Calculator

Enter your home's square footage, climate zone and age to get the AC size in tons and BTU, the nearest unit to buy and a room-by-room check.

Septic Tank Size Calculator

Enter bedrooms, occupants and floor area, pick your state's rule, and get the design flow and the smallest tank the rule allows.

Square Footage Calculator

Add each room or area in feet and inches, pick its shape, and get the total in square feet, square yards, square meters and acres.

Cubic Yard Calculator

Enter length, width and depth in the units you measured, or a square footage and a depth, and get cubic yards with cubic feet and m³.

Cubic Feet Calculator

Enter each dimension in the unit you measured it in, or switch to a cylinder or an area and depth, and get cubic feet with every conversion.

Room Square Footage Calculator

Enter the room, add closets and bays or cut out corners, and get floor, wall and ceiling square footage plus the perimeter.

Dumpster Size Calculator

List what is coming out, from shingles by the square to rooms of clutter, and get debris yards, weight and the dumpster size to rent.

TV Mounting Height Calculator

TV mounting height = your seated eye height to the center of the screen, about 42 in; a 55 in TV then sits with its bottom edge 28.5 in and its top edge 55.5 in above the floor.

Curtain Size Calculator

Curtain width = rod length × fullness (1.5 to 2.5), and curtain length = rod height minus where you want the hem; a 48 in window with an 84 in rod height needs an 84 in drop and 120 in of fabric.

Ceiling Fan Size Calculator

Ceiling fan blade span follows room area (a 168 sq ft room takes a 44 in fan) and downrod = ceiling height − 8 ft − 12 in; a 12 ft ceiling needs a 36 in downrod.

Rug Size Calculator

Rug size = furniture footprint plus margin: 24 in past a dining table on every side, 24 in around a bed, and front legs on the rug in a living room; an 84 in sofa needs a 6×9 ft rug.

Dining Table Size Calculator

Dining table length = seats per side × 24 in, and the room needs 36 in around the table; six seats take a 72 × 36 in table in a room at least 12 × 9 ft.

Bathroom Remodel Cost Calculator

Pick the bathroom size, finish level and what gets replaced, and get a low, typical and high price with every line item for your state.

Kitchen Remodel Cost Calculator

Enter the kitchen size, pick a level, cabinets and countertops, and get a low, typical and high price with each part of the job listed.

Roof Replacement Cost Calculator

Enter the roof size or house footprint, pick the material and what comes off, and get a low, typical and high price with line items.

Drywall Installation Cost Calculator

Enter the square footage or rooms, choose the finish level and your state, and get a low, typical and high price with line items.

Window Replacement Cost Calculator

Count your windows by type, pick the frame, glass and install method, and get the price per window and for the house in your state.