calc.engineer / PCB & Electronics / Op Amp Gain

Op Amp Gain v1.0.0

Calculate voltage gain and output for operational amplifier circuits in inverting, non-inverting, and differential configurations. For inverting: Av = -Rf/Ri with input impedance equal to Ri. For non-inverting: Av = 1 + Rf/Rg with very high input impedance. For differential: Av = Rf/Ri applied to (V1 - V2). Reports gain in linear and dB, output voltage when input is provided, input impedance, and phase inversion status. Ideal op-amp assumptions (infinite open-loop gain, zero input bias current). Chain from ohms_law for power budgeting or resistor_color_code for component selection.

← from ohms_law← from resistor_color_code← from voltage_dividerfeeds ohms_law →feeds trace_width →
Op-amp circuit topology. 'inverting' uses Rf/Ri feedback with input to inverting terminal. 'non_inverting' applies input to non-inverting terminal with Rf/Rg feedback. 'differential' amplifies the voltage difference between two inputs.
Feedback resistor Rf in ohms. Sets gain magnitude in all topologies.
Input/gain resistor in ohms. For inverting: input resistor Ri. For non-inverting: ground resistor Rg. For differential: input resistor on both channels.
Input voltage in volts (optional). When provided, computes actual output voltage. For differential topology, this is V1 (non-inverting input).
Second input voltage in volts (differential topology only). This is V2 (inverting input).
Fill in the inputs and Compute to see the structured result.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/op_amp_gain \
  -H "Content-Type: application/json" \
  -d '{"topology": …, "rf_ohm": …, "ri_ohm": …}'

MCP: connect to https://calc.engineer/mcp and call op_amp_gain.

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