RL Time Constant Calculator
Calculate RL circuit time constant, cutoff frequency, and inductor current rise/fall times.
Circuit Parameters
tau = L / R
I(t) = I0 x (1 - e^(-t/tau)) for current rise
Time Constant (tau)
100.00 us
Cutoff Frequency: 1.59 kHz
Current Rise Time
63.2% (1 tau)100.00 us
95% (3 tau)300.00 us
99% (5 tau)500.00 us
Rise/Fall Table
| Time | Rise | Fall |
|---|---|---|
| 1 tau | 63.2% | 36.8% |
| 2 tau | 86.5% | 13.5% |
| 3 tau | 95.0% | 5.0% |
| 4 tau | 98.2% | 1.8% |
| 5 tau | 99.3% | 0.7% |
Circuit Characteristics
Steady State Current120.0000 mA
Reactance @ 60Hz3.7699 Ohms
Reactance @ 1kHz62.8319 Ohms
Peak Energy Stored0.072000 mJ
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.