Engineering and science calculators
Engineering and science calculators estimate building material quantities, cooling load, fuel use, and shipping weight, and solve basic chemistry and physics formulas such as the ideal gas law and pH.
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Concrete CalculatorCalculate the volume of concrete, gravel, mulch, or soil for a slab or bed from its length, width, and thickness, with weight and cost.Paint CalculatorCalculate how much paint you need from the wall area, the area of doors and windows, the number of coats, and the paint coverage.Voltage Drop CalculatorCalculate the voltage drop in a copper or aluminium cable from current, one-way length, and cross-section for DC, single, or three phase.Periodic TableSearch the periodic table of all 118 elements by name, symbol, or atomic number and see each atomic mass, period, group, and block.Staircase CalculatorCalculate the number of steps, exact riser height, total run, stringer length, and angle of a straight staircase from the floor height.Tile CalculatorCalculate how many tiles and boxes you need for a floor from the room dimensions, the tile size, and a cutting waste allowance.
All 28 engineering and science calculators, A to Z
- Agricultural Unit ConverterConvert a land area between square metres, ares, hectares, acres, square kilometres, and square feet in one table.
- Battery Autonomy CalculatorEstimate how long a battery bank can power a load from its capacity in amp-hours, voltage, depth of discharge, and inverter efficiency.
- Beam CalculatorCalculate support reactions, maximum bending moment, and maximum deflection for a simply supported or cantilever beam under one load.
- BTU CalculatorEstimate the air conditioner size a room needs in BTU per hour, tons, and kW from its dimensions, occupants, and sun exposure.
- Capacitor Bank CalculatorSize a capacitor bank for power factor correction: enter the load in kW with the present and target power factor to get the kvar needed.
- CO₂ Emissions CalculatorEstimate carbon dioxide emissions from burning petrol, diesel, LPG, or natural gas and from electricity use with your own grid factor.
- Concrete CalculatorCalculate the volume of concrete, gravel, mulch, or soil for a slab or bed from its length, width, and thickness, with weight and cost.
- Crop Yield CalculatorEstimate grain yield in tonnes per hectare from plants per square metre, ears or pods per plant, grains per ear, and thousand grain weight.
- Evapotranspiration CalculatorEstimate reference evapotranspiration (ETo) in millimetres per day with the Hargreaves equation from latitude, date, and air temperatures.
- Fertilizer CalculatorCalculate how much fertilizer product to apply for a target nitrogen rate from its N-P-K grade and field area, and the P and K supplied.
- Fuel Consumption CalculatorCalculate fuel consumption in km per liter, liters per 100 km, and US mpg from distance and fuel used, plus the cost of the trip.
- Ideal Gas CalculatorSolve the ideal gas law PV = nRT for pressure, volume, amount of gas, or temperature from the other three quantities.
- Lighting CalculatorEstimate how many light fittings a room needs with the lumen method from its size, target lux level, and the lumens of each fitting.
- Paint CalculatorCalculate how much paint you need from the wall area, the area of doors and windows, the number of coats, and the paint coverage.
- Periodic TableSearch the periodic table of all 118 elements by name, symbol, or atomic number and see each atomic mass, period, group, and block.
- pH CalculatorCalculate pH and pOH from the molar concentration of hydrogen ions or hydroxide ions in a solution at 25 °C.
- Pressure ConverterConvert a pressure value between pascal, kilopascal, bar, standard atmosphere, psi, and mmHg, with every unit shown in one table.
- Roof Slope CalculatorCalculate the roof pitch angle, slope percentage, rafter length, and pitch ratio in 12 from the rise and the horizontal run.
- Roofing CalculatorEstimate the surface area of a gable roof from the building footprint and pitch, then the squares and bundles of shingles to order.
- Scale ConverterConvert a measurement on a map or plan to its real-world size, or the reverse, from the drawing scale such as 1 : 100.
- Solution CalculatorCalculate how to dilute a stock solution with C1V1 = C2V2 and how many grams of solute to weigh for a target molarity and volume.
- Square Footage CalculatorCalculate the area of a room in square feet and square metres from its length and width entered in feet or in metres.
- Staircase CalculatorCalculate the number of steps, exact riser height, total run, stringer length, and angle of a straight staircase from the floor height.
- Tile CalculatorCalculate how many tiles and boxes you need for a floor from the room dimensions, the tile size, and a cutting waste allowance.
- Transformer CalculatorCalculate the full-load primary and secondary current and the turns ratio of a single or three phase transformer from its kVA rating.
- Voltage Drop CalculatorCalculate the voltage drop in a copper or aluminium cable from current, one-way length, and cross-section for DC, single, or three phase.
- Volumetric Weight CalculatorCalculate the volumetric weight of a parcel from its length, width, and height, and the chargeable weight a courier will bill.
- Wire Gauge CalculatorConvert an American Wire Gauge (AWG) size to its diameter in millimetres and inches, cross-section area, and copper resistance per length.