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.

Current (A)

Current through the inductor.

Inductance (H)

Inductance of the coil.

Compute the energy stored in an inductor carrying current, E = 0.5 * L * I^2. 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 magnetic field.

• Inductor calculations depend on core material, air gap, turns, frequency, waveform, temperature, DC bias, copper resistance, skin and proximity effects, fringing, and saturation definition. Small-signal inductance and nominal current rating may not describe switching operation.
• 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 Energy Calculator

  Compute the energy stored in a charged capacitor, E = 0.5 * C * V^2; doubling the charge voltage quadruples the stored energy.