Op Amp Gain Calculator

Operational Amplifier Voltage Gain

An op-amp amplifies the voltage difference between its inputs. With external feedback resistors, you can set a predictable closed-loop gain for inverting or non-inverting amplifier circuits.

Gain Formulas

For an inverting amplifier:

$$A_{inv} = -\frac{R_f}{R_{in}}$$

For a non-inverting amplifier:

$$A_{non-inv} = 1 + \frac{R_f}{R_{in}}$$

The negative sign on the inverting gain means the output is 180° out of phase with the input. Both formulas assume ideal op-amp behavior with negative feedback.

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