Free tool

Op-Amp Gain Calculator

Enter the input and feedback resistors, choose the configuration and get the closed-loop gain of your stage without leaving the page.

Tools

Calculate op-amp gain according to its configuration

The tool covers inverting and non-inverting configurations. You only need to enter the relevant resistors and the gain updates when you submit the calculation.

Gain Calculator

Select the configuration type and define the two main resistors of the stage to get the theoretical gain.

Enter two resistors greater than zero to calculate the gain.
Gain--You will see the theoretical gain according to the selected configuration.

Most common formulas

These two configurations are a common foundation in analogue conditioning, measurement and control.

Inverting configuration
  • La salida invierte fase respecto a la entrada.
  • Gain: Av = - R2 / R1
Non-inverting configuration
  • Mantiene fase y suele ofrecer alta impedancia de entrada.
  • Gain: Av = 1 + (R2 / R1)

Quick guide

How to use theoretical op-amp gain in a real design

The calculator gives you the theoretical closed-loop gain of the stage. On a real board, it is also worth checking saturation, dynamic range, bandwidth, offset and resistor tolerances.

Lectura rapida

  • La configuracion inversora entrega una ganancia negativa.
  • La no inversora suma una unidad a la relacion entre resistencias.
  • R1 no debe ser cero ni valores residuales irreales.
  • La ganancia teorica debe contrastarse con la banda util del operacional real.

Inverting

Very useful when you need precise gain with a phase inversion.

Av = - R2 / R1

Non-inverting

Ideal when you want to keep the phase and present a friendlier input to the source.

Av = 1 + (R2 / R1)

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FAQ

Frequently asked questions

A short reference for the usual questions when calculating the theoretical gain of an op-amp stage.

Which configurations does the tool cover?

It lets you calculate the gain of inverting and non-inverting configurations using two resistors.

Does a negative gain mean the circuit is wrong?

No. In an inverting configuration, the negative sign indicates phase inversion, not a calculation error.

Does it work for any op-amp?

As a theoretical calculation, yes, but then you must compare the result with the limits of the real IC and its supply conditions.

Is the calculator free?

Yes. You can use it online without registration.

Next step

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