Inductor Time Constant Calculator
Calculate the RL time constant for an inductor-resistor circuit.
mH
Ω
Time Constant (tau)
0.001000 s
Time Constant (ms)1.000 ms
Settling Time (5 tau)5.000 ms
Time Constant (tau) vs Inductance
RL Time Constant
tau = L / R
Current in an RL circuit rises to 63.2% of final value in one tau. After 5 tau, current is at ~99.3% of steady state.
Example Calculation
100 mH inductor with 100 ohm resistance.
- 01tau = 0.1 / 100 = 0.001 s = 1 ms
- 025 tau = 5 ms to reach steady state
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