Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Feedback resistor (Ω)

Required number input.

Input resistor (Ω)

Required number input.

Compute the ideal closed-loop gain of an inverting op-amp from its resistors. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Closed-loop gain

The resulting closed-loop gain returned as a number.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Non-Inverting Op-Amp Gain

  Compute the ideal closed-loop gain of a non-inverting op-amp from its feedback and gain resistors.

• Op-Amp Open-Loop Gain

  Calculate open-loop voltage gain A=Vout/(V+−V−) from an unsaturated operating-point measurement. Differential input cannot be zero; this scalar does not capture frequency-dependent gain.

• Chopper Amplifier Offset

  Input-referred residual DC offset of a chopper amplifier from its zero-input output offset and closed-loop voltage gain.