Op-Amp Gain Calculator (Inverting and Non-Inverting)
Choose the configuration and enter the resistors and input voltage.
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Op-Amp Gain Calculator (Inverting and Non-Inverting) by TheCalcTools
How the Op-Amp Gain Calculator (Inverting and Non-Inverting) works
A non-inverting amplifier has gain 1 + Rf ÷ Rg and keeps the signal’s polarity. An inverting amplifier has gain −Rf ÷ Rin and flips it.
Real op-amps cannot swing past their supply rails (most stop 1 to 2 V short unless rail-to-rail), and gain falls at high frequency according to the gain-bandwidth product.
The formula
Worked example
Using the default values shown in the calculator:
| Configuration | Non-inverting |
|---|---|
| Feedback resistor Rf (kΩ) | 47 |
| Ground or input resistor Rg / Rin (kΩ) | 10 |
| Input voltage (V) | 0.5 |
| Supply rail (± V) | 12 |
- Non-inverting with 47 kΩ and 10 kΩ: gain 5.700 (15.12 dB).
- 0.5 V in gives 2.850 V.
Result:
| Voltage gain (V/V) | 5.700 |
|---|---|
| Gain (dB) | 15.12 |
| Ideal output (V) | 2.850 |
| With supply limit | 2.850 V |
| Input impedance | Very high (the op-amp input) |
Frequently asked questions
What is a voltage follower?
A non-inverting amplifier with Rf = 0 (and no Rg): gain 1, used as a buffer.
Sources and further reading
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