Inverting Op-Amp Gain Calculator
Calculate voltage gain and output of an inverting op-amp configuration from feedback and input resistors.
kΩ
kΩ
V
Voltage Gain
-10.00 V/V
Gain (dB)20.00 dB
Output Voltage-5.000 V
Voltage Gain vs Input Resistor (Rin)
Inverting Op-Amp Configuration
Formula
Gain = -Rf / Rin
V_out = -(Rf / Rin) x V_in
The negative sign means the output is 180 degrees out of phase with the input. Input impedance equals Rin.
Example Calculation
Rin = 10k, Rf = 100k, input signal is 0.5 V.
- 01Gain = -100 / 10 = -10 V/V
- 02Gain in dB = 20 x log10(10) = 20 dB
- 03V_out = -10 x 0.5 = -5.0 V
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