basic

RC Circuit Charging Time Constant Calculator

V(t) = V₀(1−e^(−t/τ)); τ = RC — capacitor charging.

Calculates the RC time constant, voltage across the capacitor at time t, and charging current for a series RC circuit.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

τ = R×C; V(t) = Vs×(1−e^(−t/RC)); I(t) = (Vs/R)×e^(−t/RC)

In depth

Calculates the RC time constant, voltage across the capacitor at time t, and charging current for a series RC circuit.