Capacitor Charge Time Calculator
Calculate the RC time constant and charge/discharge time for a capacitor and resistor circuit.
RC Timing Result
RC Time Constant:
τ = R × C
Where:
- τ (tau) = time constant in seconds
- R = resistance in ohms
- C = capacitance in farads
Charging voltage at time t:
V(t) = V_source × (1 - e^(-t/τ))
Discharging voltage at time t:
V(t) = V_initial × e^(-t/τ)
Key time milestones:
- 1τ: 63.2% charged
- 2τ: 86.5% charged
- 3τ: 95.0% charged
- 4τ: 98.2% charged
- 5τ: 99.3% charged (considered fully charged)