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RC Time Constant Calculator

τ = RC and capacitor voltage while charging or discharging.

Runs in your browser — nothing is uploaded
Circuit

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For learning, hobby and prototyping use. Not professional electrical design advice — follow applicable codes and standards.

How to use RC Time Constant Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

τ = R × C

Charging: V(t) = Vs(1 − e^(−t/τ))

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