Inverting Op-Amp Resistor Calculator

The Formula

The formula for calculating the gain of an inverting op-amp is:

$$Gain=-\frac{R2}{R1}$$

Where:

• Gain: The amplification factor of the circuit (negative due to inversion)
• R1: The input resistor
• R2: The feedback resistor

Calculation Steps

1. Determine the desired gain (use absolute value)
2. Choose a value for R1
3. Calculate R2 using the formula: R2 = Gain * R1

Example Calculation

Let's calculate R2 for an inverting op-amp with a desired gain of 10 and R1 = 1kΩ:

$$R2=10\ast 1000\mathrm{\Omega }=10000\mathrm{\Omega }=10k\mathrm{\Omega }$$

Circuit Diagram

This diagram shows an inverting op-amp circuit with the calculated resistor values for a gain of -10.