basic

Capacitor Charge and Energy Stored Calculator

Q = CV; E = ½CV² — capacitor fundamentals.

Calculates charge Q = CV, energy stored E = ½CV², and charge/discharge time constant τ = RC for a capacitor of capacitance C charged to voltage V through resistance R.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

F
V
Ω

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

Q = C·V; E = ½·C·V²; τ = R·C

In depth

Calculates charge Q = CV, energy stored E = ½CV², and charge/discharge time constant τ = RC for a capacitor of capacitance C charged to voltage V through resistance R.