// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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eng.rc-time-constant-circuit Calculator
Calculates RC and RL time constants, frequency response, and step response for first-order circuits. The RC time constant τ = RC is the time to charge to 63.2% or discharge to 36.8% — 5τ is effectively fully charged or discharged.
Inputs
Resistance Ohm
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Capacitance Uf
Ability to store electric charge (F). Capacitors charge quickly and release energy fast. Common values: pF to μF.
Supply Voltage V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Target Voltage Pct
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Results
time constant τ (ms)
Time for the capacitor (or inductor) to reach 63.2% of its final value. τ = RC. After 5 time constants (~99.3%), the circuit is effectively at steady state.
time to reach
The computed duration or time value.
-3dB frequency (Hz)
Sample size or count used in the calculation.
10-90% rise time (ms)
The computed duration or time value.
τ = RC
Reference formula or conversion factor shown for context.
fully charged
Reference formula or conversion factor shown for context.