Op Amp Differential Amplifier Calculator

Differential amplifier calculator is an online engineering tool to help you determine the output voltage of a differential amplifier based on an operational amplifier. At the output of the differential amplifier the voltage (Vout) is equal to the difference between V1 and V2, multiplied by a constant:

Vout= (R3+R1)×R4 ×V2 R3 ×V1


(R4+R2)×R1 R1

To suppress the common-mode component, i.e. to amplify the difference between V1 and V2, it is necessary to observe the ratio of the resistors' values:

R1 / R3 = R2 / R4

This calculator also displays the color coding and SMD codes for resistors used in the circuit.

Learn more about resistor color code

Learn more about SMD resistor code

You might also find helpful: Instrumentation Amplifier Calculator and Op Amp Summing Amplifier Calculator.

Designing or debugging electronic circuits? We offer Digital Multimeters and Clamp Meters for accurate measurements.


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