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Home>Tools>Inverting Op-Amp Resistor Calculator
Inverting Op-Amp Resistor Calculator

Inverting Op AMP Resistor Calculator is a great op amp calculation tool for the operational amplifier inverting circuit. With this inverting amplifier calculator, you are able to calculate the resistance of R2, R3 and R4 resistor with ease. Because you just enter the input parameters of inverting op amp gain, the output voltage(Vout), R1 Resistance, the values of V1, V2, Vp and Vn, and then click the "Calculate" button.

Input Parameters (Inverting Op-amp)
VoutV
Gain
R1KOhms
V1(Input lead)V
V2 (non-zero only if offset is requred)V
VpV
VnV
Outputs
R2KOhms
R3KOhms
R4KOhms
Op-Amp Circuit Schematic
Introduction

Easy to follow and comprehensive video of the circuit operation and design of a inverting op amp circuit: operational amplifier circuit gain; resistor value calculation, input impedance, power supplies . . . all you need to know. In this video we look at the inverting operational amplifier circuit. Description of how the circuit works is provided along with details of the components needed. The advantages and disadvantages of the inverting op amp circuit are discussed: its input impedance, output impedance and mention is made of the virtual earth point in the circuit. The formula of equation for gain is given along with a worked example of calculating the non-inverting circuit gain. Circuits are given for the inverting operational amplifier using positive and negative supplies, i.e. differential supplies as well as from a single ended supply, i.e. a single supply against ground. Finally some useful practical hints and tips are given gained from practical experience as a design engineer.

Op Amp Inverting Amplifier Circuit Design | Operational Amplifier Circuit

OP AMP Resistor Calculator Overview

OP AMP Resistor Calculator is designed by Utmel Electronic, which is one of the most professional Electrical components distributors in the World. And this calculation tool is used for inverting operational amplifier to calculates the output values of the resistors R2, R3 and R4 in the inverting OP-AMP circuit. And the output properties are in KΩohms (kilo-ohms). And you should know the parameters of operational amplifier gain, R1(KΩohms), Vout, Vp, V2 and Vn before do the operational amplifier calculation.

Definition of Inverting Op Amp

The op amp inverting amplifier circuit is simple to build and construct, requiring only a few basic electrical components. An operational amplifier circuit having an output voltage that varies in the opposite direction as the input voltage is called an inverting op amp. In other terms, it is 180 degrees out of phase.

Inverting vs. Non inverting op amp

inverting-noninverting-opamp.png

Inverting OP AMP Amplifier

inverting-operational-amplifier-circuit.png

The operational amplifier's inverting input gets feedback from the amplifier's output in an inverting amplifier circuit. The voltage at the inverting terminal is identical to the voltage at the non-inverting terminal if the op-amp is perfect and the notion of virtual short is applied at the input terminals of the op-amp. The operational amplifier's non-inverting input is linked to ground. The difference between the two input terminals is extremely minor and may be ignored because the gain of the op amp is quite high and the output from the amplifier is only a few volts. Because the operational amplifier's non-inverting input is maintained at ground potential, the inverting input must also be held at ground potential.

Non-Inverting OP Amp Amplifier

The output of a non-inverting amplifier is in phase with the input. The inverting input is where the feedback is applied. The input, on the other hand, is now applied to the non-inverting input. The output is an amplified version of the input that is not inverted (in terms of phase). The gain of the operational amplifier's non-inverting amplifier circuit is simple to calculate. The computation is based on the assumption that both inputs have the same voltage. The reason for this is that the amplifier's gain is quite high. If the circuit's output remains inside the amplifier's supply rails, the output voltage divided by the gain indicates that there is almost no difference between the two inputs.

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Frequently Asked Questions

What input parameters are required for calculating R2, R3, and R4?

You need to input the desired gain (negative value), R1 resistance (in kΩ), output voltage (Vout), power supply voltages (Vp and Vn), and optional offset voltage V2.

How are R2, R3, and R4 calculated in the inverting amplifier circuit?

R2 is derived from the gain formula: R2 = |Gain| × R1. R3 and R4 (optional bias resistors) balance input bias currents. If no offset is required (V2 = 0), R3 and R4 are typically omitted or set to match R1||R2.

Why might my calculated Vout exceed the allowed range?

The output voltage Vout must stay within the op-amp’s supply rails (Vn ≤ Vout ≤ Vp). If your input gain or R1/R2 ratio forces Vout beyond these limits, the result will be invalid (clipped). Adjust your parameters accordingly.

What is the purpose of R3 and R4 in the circuit?

R3 and R4 (if used) minimize errors from input bias currents. They are often set to R3 = R4 = R1 || R2 (parallel combination of R1 and R2) to balance the input impedance. If no offset is needed, these resistors can be omitted.

Can this calculator handle non-inverting or differential amplifier designs?

No, this tool is specific to inverting op-amp circuits. For non-inverting, differential, or other configurations, use a dedicated calculator tailored to those topologies.
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