20 Best Free Online VSWR Calculator Websites

Here is a list of best free online VSWR calculator websites. VSWR or Voltage Standing Wave Ratio is a ratio that describes the amount of power reflected for a transmission line when compared to total amount of power transmitted into the line. It basically measures the reflection of RF (Radio Frequency) energy in a transmission line. VSWR is an important parameter that needs to be calculated as it helps users evaluate how well an antenna is matched to the transmission line. If you also want to calculate the VSWR value, then check out these online VSWR calculator websites.

Using these websites, users can quickly calculate VSWR value. On most websites, users only need either Reflection Coefficient or Return Loss value to find out the actual VSWR value. Plus, the process of calculation and VSWR calculation formulas are also provided by these websites. Besides VSWR, users can also calculate Mismatch Loss, Reflection Coefficient, and Return Loss values. To help out users, I have also included the steps of VSWR calculation in the description of each website.

These websites also provide many additional tools and calculators like Microstrip Calculator, Skin Depth Calculator, Coax Calculator, Decibel Calculator, etc. Go through the list to know more about these websites.

My Favorite Online VSWR Calculator Website:

omnicalculator.com is my favorite website as it can calculate all parameters of the VSWR equation. Plus, it also explains the calculation process with examples.

You can also check out lists of best free Online Thermal Expansion, Online Reynolds Number Calculator, and Online Trajectory Calculator websites.

Comparison Table:

Features/Website Names	Shows VSWR Calculation Formula	Can also calculate Reflection Coefficient and Return Loss	Shows related diagrams or schematics
omnicalculator.com	✓	✓	✓
everythingrf.com	✓	✓	x
microwaves101.com	✓	✓	x
allaboutcircuits.com	✓	✓	✓
rfcalculator.mobi	x	x	x
antenna-theory.com	✓	x	x
ahsystems.com	✓	✓	x
antennas.ca	x	✓	x
flexautomotive.net	✓	✓	x
emtalk.com	x	✓	✓
pasternack.com	✓	✓	x
waveform.com	x	✓	x
telestrain.co	x	x	x
chemandy.com	✓	✓	✓
rfcables.com	✓	✓	x
emc-directory.com	✓	x	✓
telecom-knowledge.com	x	✓	✓
leleivre.com	x	x	x
globalspec.com	✓	✓	x
electronicsforu.com	x	✓	x

omnicalculator.com

omnicalculator.com is a free online VSWR calculator website. This website comes with multiple online calculators one of which is a VSWR calculator. This calculator allows users to calculate VSWR value using either reflection coefficient, reflected power, return loss, or mismatch loss value. All the other VSWR equation values can also be calculated using this calculator.

This website also explains what is VSWR and shows the VSWR calculation formula. Besides this, multiple VSWR calculation examples are also provided by it. It even answers common questions related to VSWR calculation. Now, follow the below steps.

How to calculate VSWR online using omnicalculator.com:

Go to this website using the given link.
After that, enter one of four available VSWR parameters.
Next, view the calculated VSWR value along with the remaining parameters.

Additional Features:

This website offers multiple online calculators covering various fields like Finance, Health, Math, Chemistry, Biology, etc.

Final Thoughts:

It is a good online VSWR calculator website that helps users calculate VSWR, Reflected Coefficient, Reflected Power, etc., parameters.

Pros	Cons
Shows calculation formulas
Shows calculation process with examples
Explains VSWR and provides a VSWR schematics

Home Page

everythingrf.com

everythingrf.com is a free online VSWR calculator website. This website helps users convert the values between VSWR, Return Loss, Reflection Coefficient, and Mismatch to minimize the losses. To perform VSWR calculations, it offers three separate calculators that take different sets of input values namely VSWR, Reflection Coefficient, and Return Loss. Through Reflection Coefficient and Return Loss calculators, users can find out VSWR values along with mismatch loss, return loss, and reflection coefficient. This website also answers questions related to VSWR calculation and shows formulas that it uses to perform the calculations. Now, follow the below steps.

How to calculate VSWR online using everythingrf.com:

Go to this website and access the VSWR Calculator.
After that, select either Enter Reflection Coefficient or Rerun Loss value.
Next, view the calculated VSWR value along with coefficient loss, return loss, etc., values.

Additional Features:

This website also provides additional online calculators such as RF Attenuators, Balanced Attenuator, Pi Attenuator, Coax, and more.

Final Thoughts:

It is a good online VSWR calculator website that can use either Reflection Coefficient or Return Loss value to calculate the VSWR.

Pros	Cons
Can use either reflection coefficient or return loss to calculate VSWR
Shows VSWR calculation formula
Answers common questions related to VSWR calculations

Home Page

microwaves101.com

microwaves101.com is another free online VSWR calculator website. Through this website, users can calculate VSWR using either undefined Return Loss or undefined reflection values. In the case of VSWR calculation using Return Loss values, it also calculates two more parameters namely Reflection Coefficient and Mismatch Loss. On the other hand, if you calculate VSWR using the Reflection Coefficient value, then it calculates Return Loss and Mismatch loss along with the VSWR value.

This website also offers an option to calculate the Reflection coefficient, return loss, and mismatch loss values using a known VSWR value. This website also provides the formulas to calculate VSWR, Return Loss, and Reflection Coefficient values. Now, follow the below steps.

How to calculate VSWR online using microwaves101.com:

Start this website and access the VSWR calculator.
After that, choose either Reflection Coefficient or Return Loss as the input value.
Next, enter the value of a selected parameter and click o the Calculate button to view the calculated VSWR value.

Additional Features:

This website also comes with an online encyclopedia covering all the topics related to microwaves.
A good set of calculators are also offered by it such as Microstrip Calculator, Skin Depth Calculator, Coax Calculator, Reactance Calculator, Wire Over Ground Calculator, and more.

Final Thoughts:

It is another good online VSWR calculator website that helps users calculate VSW, Reflection Coefficient, and Return Loss values.

Pros	Cons
Can calculate VSWR using reflection coefficient and return loss values
Shows VSWR calculation formula

Home Page

allaboutcircuits.com

allaboutcircuits.com is another free online VSWR calculator website. This website offers a VSWR/ Return Loss calculator that can perform both VSWR and Return Loss calculations. To calculate the VSWR (Voltage Standing Wave Ratio) value, it either needs Return Loss or Reflection Coefficient parameter value. Along with VSWR, it also calculates mismatch loss values.

This website also gives an overview of the VSWR and shows VSWR calculation equations. It also highlights applications that need VSWR calculations. Now, follow the below steps.

How to calculate VSWR online using allaboutcircuits.com:

Launch this website using the given link.
After that, enter select either Return Loss or Reflection Coefficient as the input parameter.
Next, enter the value of the selected input parameter.
Finally, click on the Calculate button to view VSWR, mismatch loss, etc., values.

Additional Features:

It also offers related online calculators like Decibel, LC Tank Circuit Resonance, Snell’s Law, Power Density, etc.
On this website, users can also find calculators related to fields like Connectors, Digital ICs, Electromechanical, Power, and more.

Final Thoughts:

It is another good online VSWR calculator website that helps users calculate VSWR, Power Loss, and Reflection Coefficient values.

Pros	Cons
Can calculate VSWR, Reflection Coefficient, and Return Loss values
Shows VSWR equation

Home Page

rfcalculator.mobi

rfcalculator.mobi is another free online VSWR calculator website. It is another simple VSWR calculator website that can calculate VSWR values using forward power and reverse power values. It also lets users select Watts and dBm units for input forward and reverse power values. Now, follow the below steps.

How to calculate VSWR online using rfcalculator.mobi:

Go to this website using the given link.
After that enter forward power and reverse power values in W or dBm unit.
Next, click on the tick mark to view the calculated VSWR value.

Final Thoughts:

It is a good online VSWR calculator website that can calculate VSWR using forward and reverse power values.

Pros	Cons
	Lacks information related to the VSWR calculator

Home Page

antenna-theory.com

antenna-theory.com is another free online VSWR calculator website. Through this website, users can calculate Reflection Coefficient, Reflected Power in percentage, Reflected Power in dB, and Mismatch Loss values using a known VSWR value. Make sure to enter the VSWR value greater than 1. It also shows formulas to calculate reflection coefficient, reflected power, etc., values. Although, it lacks the calculator to calculate the primary VSWR calculator. Now, check out the below steps.

How to calculate VSWR equation parameters using antenna-theory.com:

Launch this website using the provided link.
After that, enter a known VSWR value in the input field.
Next, click on the Calculate button to view the calculated reflected coefficient, reflected power, and mismatch loss values.

Final Thoughts:

It is a simple online VSWR calculator that uses the VSWR values to calculate other parameters of the VSWR equation.

Pros	Cons
	Cannot calculate VSWR value

Home Page

ahsystems.com

ahsystems.com is another free online VSWR calculator website. Using this website, users can perform VSWR Loss calculations. To do that, it uses VSWR value as input. After performing the calculation, it generated four values namely Return Loss, Mismatch Loss, Reflection Coefficient, and return loss in percentage. It also offers the definitions of all the parameters involved in the VSWR equation. It also highlights all the formulas that this calculator use. Although, it cannot be used to calculate the VSWR value.

How to perform VSWR calculations online using ahsystems.com:

Start this website and access the CSWR and Return Loss Calculations.
Now, enter the VSWR value in the input field.
Next, click on the Calculate button to view all the calculated values like return loss, mismatch loss, reflection coefficient, etc.

Additional Features:

This website also comes with additional tools like antenna beamwidth coverage calculator, frequency calculator, wavelength calculator, gain calculator, etc.

Final Thoughts:

It is a decent online CSWR calculator website that users can use to calculate VSWR equation parameters like mismatch loss, return loss, etc.

Pros	Cons
Can calculate multiple parameters of the VSWR equation	Cannot calculate VSWR value

Home Page

antennas.ca

antennas.ca is another free online VSWR calculator website. It is another good VSWR calculator website that helps users calculate VSWR, Reflection Coefficient, Return Loss, Match Efficiency, and Net Transmission Loss values. It also requires two input values to perform the calculation namely Transmitter Forward Power, and System Reflected Power values in watts. Although, it doesn’t provide any information related to VSWR calculation. Now, follow the below steps.

How to calculate VSWR online using antennas.ca:

Go to this website and access the VSWR calculator.
After that, enter Transmitter Forward and System reflected power values in watts.
Next, click on the Calculate button to start the calculation process.

Additional Features:

This website also comes with additional RF Calculators such as Antenna Gain Required, Effective radiated Power, Transmission Line Masking, and more.

Final Thoughts:

It is another good online VSWR calculator website that helps users calculate VSWR, Reflection Coefficient, Return Loss, Match Efficiency, and Net Transmission Loss values.

Pros	Cons
	Lacks information related to VSWR calculation

Home Page

flexautomotive.net

flexautomotive.net is another free online VSWR calculator website. This website comes with VSWR and a Return Loss calculator. To do that calculation, it needs Forward and Reflected power values as input. After calculation, it not only shows the VSWR value but also provides match efficiency, reflection coefficient, and power (watts and dBm). It also provides formulas to calculate VSWR, Return Loss, match Efficiency, etc., parameters. Now, follow the below steps.

How to calculate VSWR online using flexautomotive.net:

Go to this website and open up the VSWR & Return Loss Calculator.
Next, enter forward and reflected power values.
Now, click on the Update button to view the calculated VSWR value.

Additional Feature:

This website lets users print all the input and calculated values.

Final Thoughts:

It is another simple online VSWR calculator that can also be used to calculate the match efficiency and reflection coefficient values.

Pros	Cons
Shows calculation formulas

Home Page

emtalk.com

emtalk.com is yet another free online VSWR calculator website. Unlike other similar websites, it uses transmission line impedance values to calculate the VSWR value. Three impedance values that it needs are Z0 (characteristic impedance), Real Part of ZL, and the Imaginary part of ZL. Besides this, choose VSWR from the enter value menu. Next, click on the Convert button to view the final VSWR value. Now, follow the below steps.

How to perform VSWR calculation online using emtalk.com:

Go to this website and access the VSWR calculation from its Tutorials & Tools section.
Next, enter all three required impedance values.
Now, select VSWR from the value section and click on the Convert button to view the calculated VSWR value.

Additional Features:

This website also comes with RF engineering tools like Noise Figure Calculator, VSWR Calculator, Microstrip Line Calculator, HFSS Waveport Size Calculator.

Final Thoughts:

It is another good online VSWR calculator website through which users can perform VSWR calculations using transmission line impedance values.

Home Page

pasternack.com

pasternack.com is another free online VSWR calculator website. This website comes with a simple VSWR calculator through which users can also calculate Reflection Coefficient, return loss, and mismatch loss values. To find out the VSWR value, users can either input Reflection Coefficient or Return Loss value. It also shows the VSWR calculation formula. Now, follow the below steps.

How to perform VSWR calculation online using pasternack.com:

Go to this website and open up the VSWR. Return Loss Calculator.
After that, choose Reflection Coefficient or Return Loss as the input parameter.
Next, enter the value of the selected input parameter.
Finally, click on the Calculate button to view the VSWR, Return Loss, Mismatch Loss, etc., values.

Additional Features:

On this website, users can also view specifications of various RF products like RF Coax Cables, RF Connector Shorts, RF Couplers, RF Filters, etc.

Final Thoughts:

It is another good online VSWR calculator website that helps users calculate VSWR, Reflection Coefficient, and Return Loss values.

Pros	Cons
Can calculate VSWR, Return Loss, and Reflection Coefficient parameters

Home Page

waveform.com

waveform.com is another free online VSWR calculator website. Through this website, users can quickly calculate the VSWR value. Besides this, it can also be used to calculate Reflection Coefficient, Return Loss, and Mismatch Loss values. Although, it doesn’t offer information related to VSWR and VSWR calculation. Now, follow the below steps.

How to perform VSWR calculation online using waveform.com:

Visit this website and access the VSWR calculator.
After that, select Reflection Coefficient or Return Loss as the input parameter.
Next, enter the value of the selected parameter.
Finally, click on the Calculate button to view the calculated VSWR value.

Additional Features:

On this website, users can browse and purchase RF products like antenna kits, routers, parabolic antennas, etc.

Final Thoughts:

It is another standard online VSWR calculator website that anyone can use without much hassle.

Home Page

telestrain.co

telestrain.co is another free online VSWR calculator website. This website mainly offers a VSWR to Return Loss Conversion tool that can also be used to calculate the VSWR value. To calculate the VSWR value, it can either use Return Loss or Reflection Coefficient value. Along with VSWR, it can also be used to calculate Return Loss and Reflection Coefficient values. Now, follow the below steps.

How to perform VSWR calculation online using telestrain.co:

Go to this website and open up the VSWR to Return Loss conversion tool.
After that, select Return Loss or Reflection Coefficient option.
Next, enter the value of the selected parameter.
Finally, click on the Convert button to view the calculated VSWR value.

Additional Features;

This website also contains additional online services like RF Design, PLL Design, Phase Noise Testing, etc.

Final Thoughts:

It is another simple online VSWR calculation website that can also be used to calculate Reflection Coefficient and Return Loss values.

Pros	Cons
Can also calculate Return Loss, and Reflection Coefficient values

Home Page

chemandy.com

chemandy.com is another free online VSWR calculator website. This website contains a return Loss and Mismatch Loss calculator through which users can also calculate VSWR, Load Impedance, and Reflection Coefficient. It also provides a basic diagram of source impedance and complex impedance. This website also shows formulas that it uses to perform the calculation. Now, check out the below steps.

How to calculate VSWR online using chemandy.com:

Go to this website and open up the return Loss and Mismatch Loss Calculator.
After that, enter known Source Impedance, Load Impedance R, and Load Impedance J values.
Now, click on the Calculate button to initiate the conversion process.
Finally, view the calculated VSWR, load return loss, loss mismatch attenuation, etc., values.

Additional Features:

On this website, users can also be additional calculators such as Circular Capacitor, Coplanar Waveguide With Ground, Matching Pi Attenuator, and more.

Final Thoughts:

It is another simple online VSWR calculator website that uses impedance values to calculate VSWR values.

Pros	Cons
Provides source and complete impedance diagram

Home Page

rfcables.com

rfcables.com is another free online VSWR calculator website. This website comes with multiple VSWR equation parameter calculators such as Reflection Coefficient, Return Loss, VSWR, and more. To calculate the VSWR value, users can use VSWR by RL and VSWR by reflection coefficient calculators. In the first calculator, users need to input the Return Loss value to find out the VSWR value. In the second calculator, users need to input the Reflection Coefficient value to find out the VSWR value. This website also shows the formulas that it uses to calculate VSWR. Now, follow the below steps.

How to calculate VSWR online using rfcables.com:

Go to this website and select VSWR calculators.
Next, enter Return Loss or Reflection Coefficient value in the given field.
Now, click on the Calculate button to view the calculated VSWR value.

Additional Features:

This website also offers articles and products related to RF topics like Noise Figure Measurements, Cellular Phones, etc.

Final Thoughts:

It is another good online VSWR calculator website that offers two separate calculators to find out the VSWR values.

Pros	Cons
Shows calculation formulas

Home Page

emc-directory.com

emc-directory.com is another free online VSWR calculator website. On this website, users get a reflection Coefficient to VSWR calculator that can calculate both VSWR and Reflection Coefficient values. A reflected power diagram is also provided by it that highlights the behavior of forward power, reflected power, feeder, and load. It also explains the CSWR, Return Loss, and Mismatch Loss calculation formulas. Now, follow the below steps.

How to calculate VSWR online using emc-directory.com:

Go to this website and access the reflection coefficient on the VSWR calculator.
After that, enter the reflection coefficient value.
Next, click on the Calculate button to view the final VSWR value.

Additional Features:

This website also offers additional calculators such as Antenna Distance, Antenna Spot Size, Antenna half Power Beamwidth, Antenna beam width Coverage, Free Space Path Loss Calculator, etc.

Final Thoughts:

It is another good online VSWR calculator website that helps users calculate VSWR value using a known reflection coefficient value.

Pros	Cons
Explains VSWR and shows the VSWR calculation formula

Home Page

telecom-knowledge.com

telecom-knowledge.com is another free online VSWR calculator website. This website provides multiple RF calculators one of which is a VSWR/ Return Loss Calculator. This calculator can perform VSWR, Reflection Coefficient, and Return Loss calculations. It also shows a wave diagram highlighting the standing wave, original signal, and reflection. Plus, formulas used by this calculator to calculate VSWR are also provided. Now, follow the below steps.

How to perform VSWR calculation online using telecom-knowledge.com:

Visit this website and access the VSWR calculator.
After that, select Reflection Coefficient and Return Loss parameters.
Next, submit the value of the selected parameter.
Finally, click on the Calculate button to start the calculation process.

Additional Features:

This website also comes with useful RF calculators like EIRP, Power Density, Link Budget, Point-to-Point Alignment, etc.

Final Thoughts:

It is another straightforward online VSWR calculator website that anyone can use with ease.

Pros	Cons
Shows reflection wave, standing wave, and original signal diagram

Home Page

leleivre.com

leleivre.com is another free online VSWR calculator website. This website comes with simple Return Loss to VSWR and VSWR to Return Loss calculators. Through this calculator, users can find out the value of VSWR using a known Return Loss value. Similarly, users can calculate Return Loss using a known VSWR value. Although, it doesn’t provide any information related to VSWR and Return Loss calculations. Now, follow the below steps.

How to calculate VSWR online using leleivre.com:

Start this website and access the VSWR/ Return Loss Converter.
After that, enter the return loss value in the input field.
Next, click on the Calculate button to view the final VSWR value.

Additional Features:

This website also comes with additional online calculators like ADC Alias Calculator, LC Balun Designer, Path Loss Calculator, Optimal Mitre Calculator, and more.

Final Thoughts:

It is another simple online VSWR calculator website that anyone can use without much hassle.

Pros	Cons
	Doesn’t offer any information related to VSWR

Home Page

globalspec.com

globalspec.com is another free online VSWR calculator website. This website comes with a simple VSWR calculator that also explains VSWR in detail. Besides this, it also highlights all the VSWR equation parameters and shows the formula to calculate VSWR. Apart from VSWR, it can also be used to calculate Reflection Coefficient and Return Loss. Now, follow the below steps.

How to calculate VSWR online using globalspec.com:

Go to this website using the given link.
After that, submit either Reflection Coefficient or Return Loss value.
Finally, view the calculated VSWR value.

Additional Features:

This website also comes with additional online tools like Ohms’ Law Calculator, Capacitor Calculator, Voltage Divider Calculator for DC Circuits, etc.

Final Thoughts:

It is another simple online VSWR calculator website that helps users find out the VSWR value using either the reflection coefficient or return loss.

Pros	Cons
Explains VSWR and its calculation

Home Page

electronicsforu.com

electronicsforu.com is the last free online VSWR calculator website. Through this website, users can quickly calculate the VSWR value. Although, it doesn’t show the process behind VSWR calculation. To perform the calculation, users need Reflection Coefficient or Return Loss value as input. It also shows the standing wave, original signal, and reflection wave diagram. Now, follow the below steps.

How to calculate VSWR online using csgnetwork.com:

Go to this website and access the VSWR calculator.
After that, enter the Reflection Coefficient or return Loss value.
Next, click on the Calculate button to view the final VSWR and mismatch loss values.

Additional Features:

On this website, users can also access electronics projects, community projects, AI Projects, ML Projects, etc.

Final Thoughts:

It is a simple online VSWR calculator website that can also calculate the mismatch loss.

Pros	Cons
Simple to use

Home Page

Frequently Asked Questions

How is VSWR calculated?

VSWR (Voltage Standing Wave Ratio) is typically calculated using the following formula: VSWR = (1 + |Γ|) / (1 - |Γ|). Where Γ (Gamma) represents the reflection coefficient. The reflection coefficient is the ratio of the amplitude of the reflected wave to the amplitude of the incident wave at a particular point in the transmission line.

Why is VSWR calculated?

VSWR or Voltage Standing Wave Ratio is an important parameter that needs to be calculated as it helps users evaluate how well an antenna is matched to the transmission line. Besides this, it reflects the impedance matching and efficiency of RF systems. By measuring VSWR, you can evaluate the quality of power transmission and identify any impedance mismatches or signal reflections. This information helps optimize system performance, minimize power losses, and ensure reliable signal transmission.

What is the range of VSWR in dB?

In dB, the range of VSWR values typically extends from 0 dB to infinity. The lower the VSWR value, the closer it is to 1:1 impedance matching, which corresponds to 0 dB. A VSWR of 1:1 or 0 dB indicates perfect impedance matching with no reflections and is considered ideal.

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