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Non Inverting Amplifier Calculator

Work out non inverting amplifier instantly with clear inputs, formula shown and shareable results.

About Non Inverting Amplifier Calculator

A non-inverting amplifier has gain 1 + Rf/Rg, always at least unity, and presents a very high input impedance because the signal drives the op-amp input directly. Closed-loop bandwidth is the gain-bandwidth product divided by the gain, so gain and bandwidth trade one for one.

Formula

Non-inverting gain

Av = 1 + Rf / Rg; bandwidth = GBW / Av

Worked example

With the default values below, Non Inverting Amplifier Calculator returns Voltage gain of 11.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Feedback resistor
47,000 Ω
Gain resistor
4,700 Ω
Input voltage
0.15 V
Op-amp gain-bandwidth product
1 MHz

Results

Voltage gain
11.00 x
Output voltage
1.6500 V
Gain
20.83 dB
Closed-loop bandwidth
90.91 kHz

Step by step

  1. 1Values used
  2. 2Non-inverting gain
  3. 3Voltage gain= 11.00 x
  4. 4Output voltage= 1.6500 V
  5. 5Gain= 20.83 dB
  6. 6Closed-loop bandwidth= 90.91 kHz

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.

Frequently Asked Questions

Why can gain never be below one?

The input signal reaches the output through the feedback network unattenuated at minimum, so the lowest achievable gain is unity with Rf = 0.

What resistor values should I choose?

Low enough that op-amp bias current and noise are not amplified, high enough not to load the output — typically 1 k to 100 k.

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