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Electrical Calculators

This LM317 voltage calculator finds the regulated output voltage from resistors R1 and R2, or the…

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

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

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

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

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

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

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

This transformer current calculator finds the primary and secondary current from the transformer’s kVA rating and…

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