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.

Efficiency (%)

Required number input.

Output power (W)

Required number input.

Derive the required input power from a delivered output power at a given efficiency percentage. 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]

Input power (W)

The resulting input power returned as a number.

• Power-supply ripple, hold-up, inrush, efficiency, and loss calculations depend on line range, load transient, switching mode, capacitor bias and ESR, rectifier conduction interval, control limits, temperature, and component tolerance. Safety, stability, EMI, and fault behavior require separate verification.
• 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.

• Output Power From Efficiency

  Compute the delivered output power from an input power at a given efficiency percentage.

• Efficiency Percent

  Compute the percentage efficiency of a power conversion from output over input power.

• Charger Efficiency

  Calculate charger energy efficiency as delivered battery energy divided by input energy over the same charging interval, expressed as a percentage.