MAXScanner electronics calculator
RL Filter Calculator — Cutoff, Reactance & Time Constant
Calculate first-order RL cutoff frequency, inductive reactance, time constant and ideal low-pass/high-pass magnitude at a test frequency.
Results
Cutoff 1,591.549 Hz
Reactance 62.83185 Ω
Gain 0.846733
Gain -1.44507 dB
τ 0.0001 s
Formula and assumptions
fc=R/(2πL); τ=L/R; XL=2πfL.
100 Ω with 10 mH gives fc ≈ 1.592 kHz.
- Ideal series RL network.
- Winding resistance and source/load impedance are excluded unless included in R.
Frequently asked questions
What sets RL cutoff?
Resistance and inductance set the corner through fc=R/(2πL).
Does inductor resistance matter?
Yes in real hardware; include relevant series resistance when appropriate.