Capacitor Calculator (C, Q, V, Energy, RC)

Solve capacitor relationships (C = Q/V) and compute stored energy (½CV²). Optionally compute RC time constant (τ = R·C).

Enter the other two values.
Examples: 1e-6 F = 1 µF, 1e-9 F = 1 nF.
Supports scientific notation (e.g., 2e-6).
Voltage across the capacitor.
If provided, we compute τ = R·C.
C = Q / V
Q = C · V
V = Q / C
Energy: E = ½ C V²
Time constant: τ = R · C
Assumes ideal capacitor.