RC/RL/LC circuit calculator

  1. Input
  2. Options
  3. Result

Calculator settings

Circuit components

uF

RC response settings

Hz
Ideal componentsThe RC table starts with an empty capacitor when charging and a fully charged capacitor when discharging. Filter gains assume no output load. Component tolerances, ESR, losses and ratings are not modeled. The three frequency formulas describe separate RC, RL and LC circuits, not one combined network.

Result

RC cutoff
1.592 kHz
RL cutoff
15.915 kHz
LC resonance
5.033 kHz
RC time constant
0.1 ms
RL time constant
0.01 ms
RC low-pass voltage gain
0.8467
RC high-pass voltage gain
0.532
Formula
RC: 1/(2*pi*R*C), RL: R/(2*pi*L), LC: 1/(2*pi*sqrt(L*C))

RC voltage over time

Time constants
0 τ
Elapsed time (ms)
0
Charging voltage (V)
0
Discharging voltage (V)
5
Time constants
1 τ
Elapsed time (ms)
0.1
Charging voltage (V)
3.1606
Discharging voltage (V)
1.8394
Time constants
2 τ
Elapsed time (ms)
0.2
Charging voltage (V)
4.3233
Discharging voltage (V)
0.6767
Time constants
3 τ
Elapsed time (ms)
0.3
Charging voltage (V)
4.7511
Discharging voltage (V)
0.2489
Time constants
5 τ
Elapsed time (ms)
0.5
Charging voltage (V)
4.9663
Discharging voltage (V)
0.0337

RC, RL and LC circuit calculator

Use the calculator for quick filter checks, electronics notes and first-pass component estimates.

Real circuits depend on tolerances, parasitics and topology, so validate important designs with simulation or measurement.

Quick start

Explore ideal RC, RL and LC circuit formulas and RC voltage over time.

  1. Enter resistance, capacitance and inductance
  2. Set RC supply voltage and test frequency
  3. Calculate and export frequencies and the voltage table
✓ Use the calculator to turn input values into a clear, repeatable result.
✓ Keep units and assumptions visible so the calculation can be checked later.
✓ Copy the result or key numbers for reports, messages or spreadsheets.
✓ Reset to defaults when you want to compare another scenario from a clean state.
✓ Calculators run in the browser and are useful for quick estimates before formal checks.
✓ For finance, health, engineering or legal decisions, verify important results with a specialist or official source.

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