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 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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