RC & RL Time Constant Calculator


Time Constant formulas

RC Time Constant Calculator

RC Time Constant

pF nF µF F


RL Time Constant Calculator

RL Time constant

pH nH µH H


The Time Constant Calculator calculates the time constant for either an RC (resistor-capacitor) circuit or an RL (resistor-inductor) circuit.

The time constant represents the amount of time it takes for a capacitor (for RC circuits) or an inductor (for RL circuits) to charge or discharge 63%.

A user enters in the resistance and either the capacitance or inductance and the time constant value is automatically computed. The resultant value is given above in unit seconds (s).

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