Op-Amp Gain Calculator
Calculate the voltage gain of standard operational amplifier configurations. Supports both inverting (output is phase-shifted 180°) and non-inverting configurations. Also calculates the gain in decibels (dB) and the output voltage for a given input signal.
Amplifier gain
Voltage gain-10.00 ×
In decibels20.0 dB
FormulaAv = −Rf ÷ Rin
Formulas used
Inverting: Gain = −Rf ÷ Rin · Non-Inverting: Gain = 1 + (Rf ÷ Rin)
How to use this calculator
Step-by-Step Instructions
- Select configuration Choose inverting (signal enters through Rin to inverting input) or non-inverting (signal enters non-inverting input directly).
- Enter Rf The feedback resistor connected between the output and the inverting input.
- Enter Rin The input resistor. For inverting: connected between signal and inverting input. For non-inverting: connected between inverting input and ground.
- Optionally enter Vin If you provide an input voltage, the calculator also shows the expected output voltage.
Worked Example
Non-inverting amplifier with Rf = 100kΩ, Rin = 10kΩ:
Gain = 1 + (100000 ÷ 10000) = 11× (20.83 dB)
With Vin = 0.1V Vout = 0.1 × 11 = 1.1V