Twin Calculators, which combines two calculators into one, and the calculation result can be copied and pasted between the two calculators with one click.

The two calculators are displayed side by side in landscape mode, and vertically in portrait mode.

In addition to separate calculations for each calculator, the calculation result can also be copied and pasted with one click, and other calculations can be performed during the calculation process, which is convenient for comparison and recording of results during calculations.

Calculation results can be imported from one calculator to another with one click:

When the ">>" key is pressed, the calculation result of the calculator on the left will be entered at the end of the formula on the calculator on the right.

When the "<<" key is pressed, the calculation result of the calculator on the right is entered at the end of the formula of the calculator on the left.

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Mass Converter

Mass Converter supports conversions and calculations between various mass units including Metric Ton(t), Kilogram(kg), Gram(g), Milligram(mg), Microgram(μg), Troy Pound(lb t), Troy Ounce(oz t), Pennyweight(dwt), Troy Grain(grain), Long Ton(lt), Short Ton(st), Hundredweight(cwt), Hundredweight, US(cwt), Stone(st), Avoirdupois Pound(lb), Avoirdupois Ounce(oz), Dram(dr), Avoirdupois Grain(grain) and more.

Pressure Converter

Pressure Converter is an online unit transformer that supports conversions and calculations between various pressure units including Bar(bar), Pascal(Pa (= N/m²)), Kilopascal(kPa), Hectopascal(hPa), Megapascal(MPa), Millibar(mbar), Atmosphere(atm), Millimeter of Mercury(mm Hg (= Torr)), Pounds per Square Foot(lbf/ft² (= psf)), Pounds per Square Inch(lbf/in² (= psi)), Inches of Mercury(in Hg), Kilogram-force per Square Centimeter(kgf/cm²), Kilogram-force per Square Meter(kgf/m²), Millimeters of Water(mm H2O) and more.

Speed Converter

Speed Converter is an online unit transformer that supports conversions and calculations between various speed units including Meters per Second(m/s), Kilometers per Hour(km/h), Inches per Second(in/s), Kilometers per Second(km/s), Mach(mach), Miles per Hour(mph), Speed of Light(c) and more.

Voltage Converter

Voltage Converter supports conversions and calculations between various voltage units including Kilovolt(kV), Volt(V), Millivolt(mV), Microvolt(μV), Megavolt(MV) and more.

Twin Calculators