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.

Delivered (Wh) (Wh)

Required number input.

Input (Wh) (Wh)

Required number input.

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

Efficiency (%) (%)

The resulting efficiency (%) returned as a number.

• Battery capacity, state of charge, runtime, and aging depend on chemistry, temperature, discharge profile, cutoff voltage, cell balance, charge method, rate capability, self-discharge, and prior history. Nominal amp-hour or watt-hour ratings do not guarantee usable energy under every load.
• 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.

• Battery State Of Health

  Calculate battery state of health as measured full-charge capacity divided by rated new capacity, expressed as a percentage; values over 100% can be valid measurements.

• Battery Charging Efficiency

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

• Antenna Efficiency %

  Compute antenna efficiency as radiation resistance over total resistance, expressed as a percentage.