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Electrical Calculators

This VSWR calculator finds the voltage standing wave ratio from the load and line impedance, or…

This LM317 current regulator calculator finds the resistor that sets a constant output current, using the…

This NE555 timer calculator finds the output frequency and duty cycle of a 555 astable oscillator…

This series and parallel resistance calculator finds the total (equivalent) resistance of a resistor network. Enter…

This RC time constant calculator finds the RC time constant and the energy stored in a…

This kW to HP converter changes kilowatts to horsepower and horsepower back to kilowatts. Enter a…

This horsepower to watts calculator converts HP to watts and watts back to HP. Enter a…

This power factor calculator finds the power factor from real and apparent power, or from voltage…

This LED resistor calculator sizes the series resistor that keeps an LED within its safe current.…

This three phase transformer calculator relates kVA, line voltage, and line current. Enter any two values…

This single phase transformer calculator finds the turns ratio, secondary voltage, and current from your primary…

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