Construction & Engineering Calculators
Concrete, square footage, roofing, tile, paint, stair, electrical, voltage drop and Ohm's law calculators.
Concrete CalculatorCubic yards or meters and bags for slabs and columns.Square Footage CalculatorArea of rooms and lots in ft² and m², with cost.Roofing CalculatorRoof area, squares and shingle bundles from pitch.Tile CalculatorTiles and boxes needed, with grout and waste.Mulch CalculatorCubic yards or bags of mulch for a garden bed.Gravel CalculatorTons and cubic yards of gravel, stone or sand.Paint CalculatorGallons or liters of paint for a room.Stair CalculatorRisers, treads, run and stringer length with code checks.Electrical CalculatorWatts, amps and volts for DC, single- and three-phase AC.Voltage Drop CalculatorVoltage drop by wire size, length and current.Ohm's Law CalculatorSolve voltage, current, resistance and power.Resistor Color Code CalculatorDecode 4, 5 and 6-band resistor colors.BTU CalculatorAir conditioner and heater size for a room.Density CalculatorDensity, mass or volume from the other two.
About Construction & Engineering Calculators
Construction and engineering calculators estimate materials and quantities for planning and budgeting. Always add a waste allowance, follow local building and electrical codes, and have critical work checked by a licensed professional.