Non-Inverting Amplifier Gain Calculator

About this calculator

A non-inverting op-amp circuit feeds the input directly into the amplifier's positive terminal, with a feedback resistor Rf and a ground resistor Rg forming a voltage divider around the negative terminal. Because the op-amp forces its two inputs to the same voltage, the closed-loop voltage gain works out to Av = 1 + Rf/Rg — always greater than or equal to 1, unlike an inverting configuration. In decibels that same gain is expressed as dB = 20·log₁₀(Av).

This calculator takes the feedback and ground resistor values (and optionally an input voltage) and returns the gain, its decibel value, and the resulting output voltage. Electronics engineers and hobbyists use it when designing preamplifiers, sensor signal-conditioning stages, and instrumentation amplifiers where high input impedance and a non-inverted output are required, picking Rf and Rg to hit a target gain before ever touching a breadboard.