Op-Amp Gain Calculator

Setting op-amp gain from resistor values — or the reverse — comes up constantly during analog front-end bring-up. This calculator covers both inverting and non-inverting configurations, so you can size feedback resistors for a target gain or check the gain an existing circuit on a board is actually delivering.

Op-Amp Gain

Inverting and non-inverting configurations

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Configuration

Rf (feedback)

Rg (to ground)

Vin

Gain-bandwidth

V+ (positive rail)

Optional — leave blank to skip clipping checkV− (negative rail)

Gain (V/V)

11.0000

Gain (dB)

20.83 dB

Vout

1.10 V

Noise gain

11.000

Closed-loop BW

90.9 kHz

Non-inverting gain never goes below 1×. Input impedance is the op-amp's own, so source loading is negligible.