ESR calculator

Calculates equivalent series resistance properties of a power source

Example 1: Must calculate the ESR of a 9V battery having a voltage drop of 0.8V during 500mA loadView example
Idle voltagevolts
Load voltagevolts
Currentamperes
ESRohms
You may use one of the following SI prefix after a value: p=pico, n=nano, u=micro, m=milli, k=kilo, M=mega, G=giga
Fill in all values except the one you wish to calculate
  • Idle voltage - Voltage of the power source without any load
  • Load voltage - Voltage of the power souce during load
  • Current - Current during load
  • ESR - Internal resistance of the power source