Design op-amp circuits with confidence. Use Operational Amplifier Gain Calculator

01/15/2026

Operational amplifier gain calculator is an online engineering tool to help you determine the voltage gain of an operational amplifier. This calculator supports both inverting and non-inverting operational amplifier circuits. Just enter values for any two of the three parameters to calculate the remaining one: enter known values for R1 and Rf to calculate the voltage gain or you can enter gain and one of the resistors values (R1 or Rf) to calculate the other one.
Calculate voltage gain for inverting and non-inverting operational amplifier circuits using resistor values. A practical tool for engineers, students, and technicians.

This tool also displays resistor color coding and SMD resistor code.