8 Best Free Online Noise Figure Calculator Websites

Here is a list of best free online Noise Figure Calculator websites. The Noise Figure indicates the amount of degradation that occurred in the signal-to-noise ratio due to a device. In an electrical system, various electrical components (amplifiers, mixers, ) introduce noise to signals. The noise can be introduced by various reasons like shot noise, flicker, thermal effects, etc. To calculate the amount of noise figure in electrical components, users need these noise figure calculator websites.

Using these websites, users can calculate the total Noise Figure of multiple cascade stages of components. To do that calculation, users need to enter the Noise and Gain values of each cascaded component. Apart from Noise figures, some of these websites can also calculate the total gain using the same set of input values. Some websites also show the calculation steps and formulas that they use to perform the calculation. After performing the calculation, users can view and copy the final results. To help new users, I have also included the necessary calculation steps in the description of each website.

On these websites, users also get additional tools such as Channel Capacity Calculator, Parabolic Dish Antenna, ADC Alias Calculator, Coax Impedance Calculator, etc. Go through the list to know more about these websites.

My Favorite Online Noise Figure Calculator Website:

everythingrf is my favorite website as it can calculate both noise figure and total gain on an n-stage circuit. Plus, it also shows the formula that it uses to calculate the noise figure.

You can also check out lists of best free Online Image Distortion, Online Battery Life Calculator, and Online CAA Record Generator websites.

Comparison Table:

Features/Website Names	Shows noise figure diagram	Shows Calculation Formula	Provides calculation steps or examples
everythingrf	✓	✓	✓
pasternack.com	✓	✓	x
omnicalculator.com	x	✓	✓
allaboutcircuits.com	✓	✓	x
qorvo.com	x	✓	x
leleivre.com	x	✓	x
emtalk.com	✓	✓	x
rfwireless-world.com	✓	x	✓

everythingrf

everythingrf is a free online noise figure calculator website. This website mainly offers a cascaded noise figure calculator that allows users to calculate the total noise figure and total gain of a cascaded circuit like a multistage amplifier. To perform the calculation, users need to specify the number of stages in a cascade circuit, Noise figure (db) & Gain (db) values of each stage. After performing the calculation, it shows the total noise figure and total gain values.

This website also shows an n-stage cascaded amplifier diagram and noise figure calculation formula. Now, follow the below steps.

How to calculate noise figure online using everythingrf:

Start this website and access the Cascaded Noise Figure Calculator.
After that, specify the number of circuit stages.
Next, enter the noise figure and gain values of all stages.
Finally, click on the Calculate button to view the total noise figure value.

Additional Features;

This website also offers additional tools like RF Attenuator Calculator, Balanced attenuator Calculator, Tee Attenuator Calculator, Coax Calculator, IRA Calculator, and more.

Final Thought:

It is a simple online noise figure calculator website through which users can calculate both total noise figures and total gain values.

Pros	Cons
Shows n-stage cascaded amplifier diagram
Provides calculation formula

Home Page

pasternack.com

pasternack.com is another free online noise figure calculator website. It is another good website to calculate noise figures of multi-stage cascade amplifiers. It supports cascaded amplifiers of up to 10 stages. Along with the noise figure, it can also calculate the Total Gain of the circuit. To help out users, it also shows the formula that it uses to calculate the total noise figure. Now, follow the below steps.

How to calculate noise figure online using pasternack.com:

Go to this website using the given link.
After that, specify the number of cascaded amplifiers.
Now, enter the Noise and Gain values of each amplifier.
Finally, click on the Calculate button to view total noise figure and total gain values in dB.

Additional Features:

On this website, users can also browse and purchase Cables, Adapters, Filters, Noise Sources, Surge Protectors, etc., equipment.

Final Thoughts:

It is another good online noise figure calculator that can calculate noise figures of multi-stage cascaded amplifiers.

Pros	Cons
Shows calculation formula

Home Page

omnicalculator.com

omnicalculator.com is another free online noise figure calculator website. This website comes with multiple online calculators one of which is a Noise Figure Calculator. This calculator can calculate the noise figure of multiple-stage cascaded amplifiers. It can also use SNR (db), SNR (absolute), and Noise Factor values to calculate the noise figure.

This website also explains both noise figures and noise factors. It also explains the steps to calculate the noise figure. Plus, it also shows essential calculation formulas that it uses to find out the noise figure value. Now, follow the below steps.

How to calculate noise figure online using omnicalculator.com:

Go to this website using the given link.
After that, choose cascaded amplifiers, SNR, or Noise Factor option.
Now, enter the required input values.
Finally, view the calculated noise figure in db unit.

Additional Features:

This website users get multiple calculators associated with fields like Biology, Chemistry, Construction, Finance, Maths, etc.

Final Thoughts:

Through this website, users can perform noise figure calculations using either SNR, Cascaded Amplifiers, and Noise Factor values.

Pros	Cons
Can calculate NF using SNR, Cascaded Amplifiers, and Noise Factor values

Home Page

allaboutcircuits.com

allaboutcircuits.com is another free online noise figure calculator website. This website offers a simple noise figure calculator that calculates noise figures of multiple cascaded amplifiers. Although, users need to enter the Noise and Gain values of all the cascaded amplifiers. It also shows a basic cascaded amplifier circuit diagram along with necessary noise figure calculation equations. After performing the calculation, it shows total noise and gain values in the decibel unit. Now, follow the below steps.

How to calculate noise figure online using allaboutcircuits.com:

Go to this website using the given link.
After that, specify the number of cascaded amplifiers.
Next, enter the noise and gain values of each amplifier stage.
Finally, click on the Calculate button to view the noise figure and total gain values.

Additional Features:

This website also offers some related calculators such as noise figure, noise temperature, Sinclair 300, and more.

Final Thoughts:

It is another good online noise figure calculator website that helps users find out the noise figure values of multi-stage cascaded amplifiers.

Pros	Cons
Shows cascaded amplifiers diagram
Provides necessary calculation equations

Home Page

qorvo.com

qorvo.com is another free online noise figure calculator website. This website offers a cascade analysis calculator that can also be used to find out the Noise Figure value. Plus, it lets users mix the components (Amplifier, Attenuator, Filter, Saw Filter, Mixer, etc.) of each stage. Apart from, the noise figure, users can also calculate Gain, P1db, and IP3 values. It also shows the equation that it uses to calculate the Noise Figure. Now, follow the below steps.

How to calculate noise figure online using qorvo.com:

Go to this website and enter the number of stages.
Next, select the component of each stage from the available ones.
Now, enter the NF values of each stage.
Finally, view the calculated ND value in the dB unit.

Additional Features:

On this website, users can browse and purchase various electronic components like Amplifiers, Discrete Transistors, Power Solutions, Mobile Amplifiers, and more.

Final Thoughts:

It is another good noise figure calculator website that can also be used to calculate Gain, IP3, and P1dB values.

Pros	Cons
Supports separate components for each stage
Shows calculation formulas

Home Page

leleivre.com

leleivre.com is another free online noise figure calculator website. Through this website, users can quickly calculate the noise figure values of up to 6 cascade stages. As input, it needs NF and Gain value of all the stages. It also shows the equations that it uses to perform the noise figure calculation. After performing the calculation, it also shows the Cascade Gain value. Now, follow the below steps.

How to calculate noise figure online using leleivre.com:

Visit this website and select the Cascaded Noise Figure Calculator.
Now, enter the NF and Gain values of up to 6 cascade stages.
Next, click on the Calculate button to view the cascade noise figure and gain values.

Additional Features:

A good set of additional RF Tools are also present on this website like ADC Alias Calculator, Attenuator Calculator PI, LC Resonance Calculator, Path Loss Calculator, and more.

Final Thoughts:

It is another good online noise figure calculator website that anyone can use with ease.

Pros	Cons
Shows calculation formulas

Home Page

emtalk.com

emtalk.com is another free online noise figure calculator website. This website offers a simple Noise Figure Calculator that works with up to 30 cascade stages. Users need to provide the NF and Gain values of all the cascade stages. It also shows a basic cascade circuit diagram and noise figure calculation formula. After performing the calculation, it shows the total noise figure, total gain, and noise temperature in kelvin. Now, follow the below steps.

How to calculate noise figure online using emtalk.com:

Launch this website and access the Noise Figure Calculator.
After that, specify the number of cascade stages.
Next, enter the NF and Gain values of each stage.
Finally, click on the Calculate button to view the final Total NF, Total Gain, and Noise Temp values.

Additional Features:

This website also offers additional RF and engineering tools like Microstrip Line Calculator, VSWR Calculator, Microstrip Path Antenna Calculator, and more.

Final Thoughts:

It is another good online noise figure calculator that anyone can use to calculate noise figure, total gain, and noise temperature values.

Pros	Cons
Can also calculate total gain and noise temp values

Home Page

rfwireless-world.com

rfwireless-world.com is the last free online noise figure calculator website. Through this website, users can calculate noise figures of up to 4 stage cascaded amplifiers. Like other similar websites, it also needs Noise Figures and Gain Values of all cascade stages. It also offers an example highlighting the aggregate figure calculation process. After calculation, users get the Aggregate noise figure (in linear terms) and Aggregate Noise Figure (in dB). Now, follow the below steps.

How to calculate noise figure online using rfwireless-world.com:

Go to this website using the given link.
After that, enter the Noise Figure and Module Gains of all stages.
Now, click on the Calculate button to view the calculated noise figure values.

Additional Features:

This website also offers additional online calculators and converters such as Channel Capacity Calculator, Radar Range Calculator, Power Unit Conversion, Floating vs Fixed Point, etc.

Final Thoughts:

It is another good online noise figure calculator website that can calculate 4-stage aggregate cascaded noise figure values.

Pros	Cons
Provides a calculation example

Home Page

Frequently Asked Questions

How do you calculate noise figure?

To calculate the noise figure, you need to first determine the input signal-to-noise ratio. After that, measure the output signal-to-noise ratio. After that calculate the noise figure (NF) using the given formula: NF (dB) = 10 * log10 (SNR_out / SNR_in).

What is the noise figure in SNR?

The noise figure is a measure of the degradation in the signal-to-noise ratio (SNR) caused by a device or system. It is usually expressed in decibels (dB). The SNR represents the ratio of the power of the desired signal to the power of the noise present in the signal. Noise figure. On the other hand, quantifies the degradation in SNR caused by a device or system. It represents the additional noise introduced by the device or system beyond what is present in the input signal.

Can noise figure be less than 1?

No, the noise figure cannot be less than 1. The noise figure is always equal to or greater than 1. A noise figure of 1 dB would indicate that the device or system introduces the same amount of noise as an ideal, noiseless system. In practical terms, it is not possible to achieve a noise figure less than 1 dB because all real-world components and systems introduce some amount of noise.

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