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Capacitor Safety Discharge Calculator Tool

This Capacitor Safety Discharge Calculator helps to determine the discharge rate of a capacitor at known capacitance and charge through a fixed-value resistor. Enter the initial voltage, time, resistance, and capacitance into the calculator. The calculator will display the total voltage discharged and remaining. Many factors need to be considered when choosing a discharge resistor. Safety standards require the voltage across a capacitor to reach a safe voltage before a person is able to touch it. In the USA, standards such as UL, OSHA, NTA, ETL, MET, etc. will have the requirements available for the needs of your product.
Capacitor Value µF
Initial Charge Voltage V
Safety Threshold Voltage V
Resistance Value Ω
Safe Voltage Achieved by
= s
Initial Power Across the Resistor
= W
Time Constant
= s
Energy Discharged to Zero Volts
= J
Desired Discharge Time s
Safe Voltage Achieved by
= Ω
Initial Power Across the Resistor
= W
Time Constant
= s
Energy Discharged to Zero Volts
= J

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