Difference Amplifier Calculator

Calculate output voltage for an op-amp difference amplifier circuit.

Circuit Parameters

V1 (Inverting Input) - Volts

V2 (Non-Inverting Input) - Volts

R1 (Ohms)

R2 / Rf (Ohms)

R3 (Ohms)

R4 (Ohms)

Resistors are matched (R1=R3, R2=R4) - optimal CMRR

-0.5000 V

Output Voltage

1.000

Differential Gain

0.0 dB

Gain (dB)

Differential Voltage (V2-V1)-0.5000 V

Common Mode Voltage2.2500 V

CMRR (estimated)~60 dB

Vout = (R2/R1) * (V2 - V1)

For best CMRR, use matched resistors: R1=R3 and R2=R4