16 Best Free Online Watts to dBm Calculator Websites

Here is a list of the best free online Watts to dBm calculator websites. Watt is the standard unit of power. This unit specifies the rate at which energy is dissipated. On the other hand, dBm (decibel-milliwatts) is used to express power level in decibels. A Watts to dBm calculator uses the P(dBm) formula to calculate the dBm value from Watts. Using an online calculator, you can get quick and accurate results.

This post covers 16 free websites with Watts to dBm calculators. These websites offer online conversion calculators where you can convert the power of watts to decibels per milliwatts. You simply have to add the watt value and then perform the conversion. Some of these calculators provide additional functionalities including dBm to Watts conversion and conversion table. etc. You can go through the list and check these out.

My Favorite Online Watts to dBm Calculator

5G-Tools.com is my favorite website on this list to calculate watts to dBm. It offers multiple calculators to convert watts/milliwatts to dBm and vice versa. It shows the result almost instantly. Along with that, it also provides related theoretical information, formulas used, and conversion table.

You can check out our other lists of the best free online Horsepower Calculator websites, online Hydroelectric Power Calculator websites, and online Internal Resistance Calculator websites.

Comparison Table:

Name	watts to dBm	dBm to watts	Additional Features
5G-Tools.com	✓	✓	-
OmniCalculator.com	✓	✓	Share results
RapidTables.com	✓	x	-
EverythingRF.com	✓	x	-
Calculatorology.com	✓	x	-
EMC-Directory.com	✓	x	-
Pasternack.com	✓	✓	-
EliteRFLLC.com	✓	x	-
Suntsu.com	✓	✓	-
NetControl.com	✓	✓	-
HardwareBee.com	✓	x	-
RFWireless-World.com	✓	✓	-
M0ukd.com	✓	✓	Unit conversion
AppleConverter.com	✓	✓	-
CoolConversion.com	✓	✓	-
RFMentor.com	✓	✓	-

5G-Tools.com

5G-Tools.com is a free website that offers many RF wireless tools and calculators. Its Watt to dBm converter calculator allows you to calculate the dBm from Watt (or mW) and back (Watt or mW from dBm). There are three different calculators for all these conversions. You can pick the first (Watt <-> dBm converter) and enter the watt value. Then you can perform the conversion to get the dBm output. Apart from the calculator, this page also offers information about Watt to dBm (decibel-milliwatts) converter and covers a dBm to Watt values conversion table.

Highlights:

• This covnerter calculator can calculate watts to dBm and vice versa.
• It also has a conversion table for dBm (decibel milliwatts) to Watt values.

OmniCalculator.com

OmniCalculator.com has a free online dBm to Watts Calculator. This is a multi-purpose calculator that supports four conversion configurations:

• dBm to watts
• dBm to milliwatts
• watts to dBm
• milliwatts to dBm

You can select a conversion type of your choice and perform the conversion. In the case of watts to dBm conversion, you have to select the respective (third) conversion type. When you select that, it gives you an input section to add the value of watts. You can simply add the value and get that converted to dBm right away.

Highlights:

• This calculator supports 4 conversion types for watts to dBm and vice versa.
• It provides definitions of related terms and explains the terms with examples.
• It provides a share link that you can use to share the calculator with your calculations.

RapidTables.com

RapidTables.com is a free website with online calculators and converters. It has a free watts to dBm conversion tool. The has a small area where it shows watts and dBm. You can enter the power in watts into the watts section. After that, you have to click the Convert button to perform the conversion. This gets you the converted dBm value in the section below. There is also a Reset button that you can use to erase everything and perform a new watts to dBm calculation. Along with that, there is a section on the web page where it teaches you the process of conversion with the help of an example.

Highlights:

• This calculator performs watts to dBm conversion only.
• It teaches the process of conversion with an example.
• It has a Watt to dBm conversion table.

EverythingRF.com

EverythingRF.com offers a free online Watts to dBm Conversion Calculator. This calculator has an organized interface with an input section where you have to enter the watt value. After that, you can run the calculator to get the dBm conversion. It shows the dBm value below that under the result section. Along with the calculation, it also shows a formula for reverse conversion including an example as well. Similar to other calculators, it also has a watt to dBm conversion table. It shows a short table alongside the calculator. From there, you can view the full conversion table that takes you to the full table at the bottom of the page.

Highlights:

• It is a simple watt to dBm converter.
• It shows a formula with an example to convert dBm to watts.
• This tool also contains a Watt to dBm conversion table.

Calculatorology.com

Calculatorology.com has a free online Watts to dBm conversion calculator. This calculator gives you instant output as soon as you click the convert button. To perform the conversion, you have to enter the power in watts. Then it gets you decibels in milliwatts for the given input. The web page of this conversion calculator also provides theoretical information about the conversion process. It covers an example with a step-by-step solution.

Highlights:

• This website has an instant Watts to dBm conversion calculator.
• It explains the process of conversion with examples.

EMC-Directory.com

EMC-Directory.com is another free website where you can convert watts to dBm online. It has a simple calculator for this task. The calculator has an input section for the watt value. This is followed by a Calculate button. All you have to do is enter the value in watts and click that button. This calculator takes a second and then gets you the output in dBm. Apart from the calculation, it covers the formula used in the calculation. It shows the formula directly on the screen followed by an example. However, there is no detailed explanation or anything else.

Highlights:

• This calculator converts watts to decibels per milliwatts.
• It shows the conversion formula with an example.

Pasternack.com

Pasternack.com offers a multiple-function conversion calculator that you can use for Milliwatts, Watts, dBm, dBW, Millivolts, and Volts. There are two dropdown sections to select input type and output type. Depending on what you require, you can select the respect unit for input and output. For Watts to dBm conversion, simply pick Watts as the input type and dBm as the output type. After that, you can simply add the watts value and perform the calculation.

Highlights:

• This calculator supports 4 conversion types
• It can convert watts to dBm and vice versa.

EliteRFLLC.com

EliteRFLLC.com is another website with an online Watts to dBm calculator. You can use this calculator to convert RF power from Watts to decibel-milliwatts (dBm). To perform the calculation, you get an input section on the screen. Simply add the value of watts into that section. Then click the Calculate button. Within a second, the calculator gives you the output in dBm.

Highlights:

• This calculator converts RF power from watts to dBm.
• There is nothing additional here.

Suntsu.com

Suntsu.com has a dBm to Watts Converter that you can use to convert dBm to Watts and vice versa. This converter calculator has two sections for Watt and Decibel-milliwatt. You can simply add value in any of those fields to convert to another. For Watts to dBm conversion, enter the value of watts in the respective section. Doing that instantly gets you the value of dBm in the Decibel-milliwatt section.

Highlights:

• This is a simple watts to dBm calculator.
• It can also convert dBm to watts.
• It shows the Power conversion formula for dBm to Watts.

NetControl.com

NetControl.com has a bidirectional converter calculator that you can use for Watts and dBm. It has watts input on one side and dBm input on the other. Along with that, you get two buttons to calculate the respective value. You can simply add the watt value in the watts section and then click the Calculate dBm button. This gets you the dBm value.

Highlights:

• This calculator can convert watts to dBm and vice versa.

HardwareBee.com

HardwareBee.com has a simple online Watts to dBm converter calculator. The calculator has an input section for Watts at the top. Then there is a button to run the conversion. You have to add the value and click that button. When you do that, it shows you the converted dBm value in a labeled section below. This web page also provides information on the conversion covering the formula and examples.

Highlights:

• This is a simple watts to dBm converter calculator.
• It explains the conversion formula with an example.

RFWireless-World.com

RFWireless-World.com is another free website where you can convert Watts and dBm. This website offers two converter calculators. One calculator is to convert watts to dBm and another is for the vice versa. Both calculators are similar. You get an input section where you can add the value and then perform the conversion. It shows the converted value right away.

Highlights:

• This is a simple watts to dBm converter calculator.
• It provides a dBm to watts converter calculator as well.

M0ukd.com

M0ukd.com has a free online dBm, dBW, µW, mW, Watt, KW, and MW Calculator. When you perform a conversion, it converts the input to all these units. The calculator has an input section at the top. You can select the input unit, add value, and run the conversion. Within a second, it converts that input to all other power units and shows them all on the screen. It has a toggle that you can use to get the decimal output. By default, it rounds off the conversion but you can enable the decimal toggle for accurate conversion values.

Highlights:

• This calculator can convert multiple power units.
• It converts each input to all the available units.

AppleConverter.com

AppleConverter.com has an online dBm converter. This converter can convert Watts, Milliwatts, dBm, and dBW. It has four input sections for each of these parameters. Each section has a convert button alone. You can add any parameter and convert that to another three. You can reset the calculator with a click and start another conversion. The conversion is instant and shows results in respective sections.

Highlights:

• This is a multi-function power conversion calculator.
• It can convert  Watts, Millwatts, dBm, and dBW.

CoolConversion.com

CoolConversion.com is a free website with unit converters and calculators. This website has a simple calculator that can convert watts to dBm and vice versa. It has two input sections labeled for watts and dBm. You can add value to one to get the converted value of others. Along with the quick conversion, it also provides an explanation of the conversion. It starts with the formula and shows how the watt-to-dBm conversion is done.

Highlights:

• This website offers a watt to dBm converter calculator and vice versa.
• It explains the conversion including the formula.

RFMentor.com

RFMentor.com is another free website to calculate Watts to dBm. The website has a multi-purpose tool to convert various units of power. It has a dropdown menu where you can pick the type of conversion. It has a Watt to dBm conversion. You can select that and then enter the value of watts to perform the conversion. After adding the watt value, simply click outside of the input section. Doing this instantly shows the converted dBm value.

Highlights:

• This is a watts to dBm and vice versa converter calculator.
• It can also convert other units of power.

Frequently Asked Questions