Construction & Home Calculators

Concrete, square footage, paint, roof pitch, deck materials and solar panel output.

• Concrete Slab CalculatorEnter the length, width and thickness of your slab to see how many cubic yards of ready-mix to order or how many bags of concrete mix to buy.
• Square Footage CalculatorMeasure a room, lot or garden by entering its dimensions.
• Paint CalculatorEnter your room size, the number of doors and windows and how many coats you plan to get the gallons of wall paint to buy.
• Roof Pitch CalculatorEnter the rise and run of your roof to get the pitch ratio roofers use, the angle in degrees and the factor for converting flat area to actual roof surface.
• Deck Material CalculatorEnter the deck dimensions and the board and joist sizes you plan to use to get a first-pass materials list.
• Solar Panel Output CalculatorEnter the size of a solar system and your local peak sun hours to estimate how much electricity it makes, what that is worth on your bill and how long it takes to pay for itself.
• Wire Size CalculatorEnter the system type and voltage, the current, the one-way distance and the wire material.
• Amps to kW CalculatorChoose the direction, the system type and the voltage, then enter the amps or the kilowatts.
• Generator Size CalculatorEnter the running watts of the lights and electronics, of other appliances, and of your largest motor such as a well pump or air conditioner.
• NEC Load CalculatorEnter the home’s living area, the nameplate loads of the large appliances and the air conditioning and heating.
• Tile CalculatorEnter the size of the room, the size of one tile and the grout joint.
• Flooring CalculatorEnter the room as a length and width, or as a floor area.
• Mulch and Gravel CalculatorEnter the length, width and depth of the area, and choose the material.
• Board Foot CalculatorEnter the thickness and width in inches, the length in feet and how many boards you have.
• Stair CalculatorEnter the total height from floor to floor, the riser height you would like and the tread depth.
• Rafter Length CalculatorEnter the building span, the roof pitch as rise per 12 inches of run, and the overhang.
• Fence CalculatorEnter the length of the fence and how far apart the posts go.