Operational Amplifier Gain Calculator
Find non-inverting op-amp gain from two resistor values.
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Operational Amplifier Gain Calculator
How to use this tool
- Enter the feedback resistor and the input resistor, both in the same units.
- Press Generate to see the voltage gain.
- Adjust the feedback resistor to see how gain changes.
Worked example
With a feedback resistor of 100 k ohms and an input resistor of 10 k ohms, gain is 1 + 100 / 10 = 11.
What this tool does not do / Limits
This assumes an ideal op-amp in a non-inverting layout. It ignores supply rails, output limits, bandwidth, input offset and resistor tolerance, and it is an estimate, not a substitute for a component datasheet or a qualified electrician.
Frequently asked questions
Why is the gain 1 plus the resistor ratio?
The feedback network feeds back R1 / (R1 + Rf) of the output, so the closed-loop gain works out to 1 + Rf / R1.
Can gain be less than 1 here?
No: a non-inverting amplifier always has a gain of at least 1; for lower gain use a divider or an attenuator instead.
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