The formula to convert dBm to W/m² is:

**
S** [W/m²] = (10^(

**p**[dBm]-

**G**[dBi]) / 1000) * ((4 *

**Pi**) / (

**Lambda**[m]²))

Remarks:

G = Antennagain

Lambda = Wavelength

Pi = 3,1415

**Example:**

Say your have a reading of **-40dBm** at **950MHz** with a HyperLOG 7025 antenna (which offers a gain of **4,9dBi** at 950MHz). The result is:

**0,000.004.08W/m²** or **4,08µW/m²**

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Hello,

I am Javier. I am interested on citing the source of this formula (page 63 of manual) in an article and would like to ask if you know a solid reference to use. Also I would appreciate if you could share a mistaken formula and its reliable source to convert dBm to W/square meter where frequency is not considered.

I would appreciate your valuable feedback

Regards,

Javier

This is standard math and physics.

The formula clearly shows that its IMPOSSIBLE to convert dBm to W/m² WITHOUT adding the frequency.

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I have a hyperlog 6080 what is the antennae gain and where do I find the lambda number for the formula?

Where do you get the dBi number?

where do you get the dBi number?

The W/m2 numbers, I don't understand why the , comes before a decimal point. For example 0,00.004.08W/m2 what does the comma and decimal point mean in comparison with american numbers.

This are the international physical ISO standards used by most of the world. The US simply do it "wrong".

Have a look at https://en.wikipedia.org/wiki/Decimal_mark

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Where I Will get dBm number?