RC charging
V(t) = V_s × (1 − e^(−t/RC)) for charging from zero. τ = RC.
Components
Free · no account
EN · FR
RC Time Constant Calculator
Time constant and charge/discharge milestones for an RC circuit.
Loading the calculator…
One time constant reaches about 63.2%; five time constants are often treated as settled.
Advertisement
Assumptions and limits.
- First-order RC circuit with an ideal step source.
Frequently asked questions
Is five time constants exact?
It is a practical approximation: 1 − e^−5 ≈ 99.3%.