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Construction and Science Calculators
Materials, electrical and weather calculators with editable assumptions.
Estimate materials for building and home projects and work through electrical and weather formulas. Quantities depend on products and local practice, so each tool lets you change coverage, density and waste allowances.
Concrete CalculatorConcrete volume in yards and meters, with the number of bags for a slab or round column.Gravel CalculatorGravel volume and weight for driveways, paths and bases, with an editable density.Mulch CalculatorMulch volume in cubic yards and meters, plus bag count, for any garden bed or area.Tile CalculatorTiles and boxes needed for a floor or wall, including grout joint width and waste.Paint CalculatorGallons or liters of paint for a room, after doors and windows, coats and coverage.Flooring CalculatorFloor area, waste allowance, boxes and optional cost for plank, laminate or vinyl flooring.Roofing CalculatorSloped roof area, roofing squares and shingle bundles from footprint, overhang and pitch.Brick CalculatorBricks and mortar volume for a wall from brick size, joint thickness, openings and waste.Stair CalculatorNumber of steps, exact riser, total run, angle and stringer length for a straight stair.Ohm's Law CalculatorEnter any two of V, I, R and P to solve the other two with Ohm's law and the power law.Watts, Amps and Volts CalculatorConvert between watts, amps and volts for DC, single-phase AC and three-phase AC with power factor.Resistor Color Code CalculatorDecode 4 and 5 band resistor colors to ohms and tolerance, or find the bands for a value.Voltage Drop CalculatorVoltage lost in a cable run from length, current, wire size and material, with percentage and heat loss.Battery Life CalculatorEstimate battery runtime from capacity, voltage, load, usable depth of discharge and efficiency.Density CalculatorSolve density = mass ÷ volume for any of the three quantities with metric and imperial units.Wind Chill CalculatorFeels-like cold temperature from air temperature and wind speed using the 2001 NWS formula.Heat Index CalculatorFeels-like hot-weather temperature from air temperature and relative humidity (NWS method).Dew Point CalculatorDew point from temperature and relative humidity, or relative humidity from the dew point, via Magnus.Horsepower CalculatorHorsepower, torque or rpm from the other two, plus hp, PS, kW and watt conversions.Room Heating and Cooling CalculatorRule-of-thumb BTU per hour for heating or cooling a room, with adjustments you can edit.
Estimating note: Quantities and ratings here are estimates for planning and learning. Products, local codes and site conditions differ, so check manufacturer data and local regulations, and use a qualified professional for electrical, structural or safety-critical work.