Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Capacitance (F)

Capacitance of the component.

Voltage (V)

Voltage across the capacitor.

Compute the energy stored in a charged capacitor, E = 0.5 * C * V^2; doubling the charge voltage quadruples the stored energy. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Energy stored (J)

Energy stored in the electric field.

• Capacitance, ESR, leakage, ripple rating, lifetime, and self-resonance vary with frequency, temperature, DC bias, aging, dielectric, package, and mounting. Nominal capacitance alone does not determine in-circuit impedance or reliability.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Capacity From Energy

  Convert stored energy in watt-hours to amp-hour capacity at a nominal pack voltage.

• Battery Charging Efficiency

  Energy efficiency of a charge cycle from measured energy stored and energy drawn from the charger.

• Capacitor Arrhenius Lifetime Estimate

  Scale a reference lifetime to another absolute temperature with an activation-energy Arrhenius factor, L=Lref exp[Ea/k(1/Tuse−1/Tref)]. Supply a component-specific Ea; voltage stress and other ageing mechanisms are excluded.