RF Power Density Calculator

RF Power Density

RF Power Density refers to the amount of electromagnetic radiation power per unit area. It is commonly expressed in watts per square meter (W/m²) and serves to quantify the strength of radiofrequency (RF) signals. Here are the essential points to understand:

Units: RF Power Density is quantified in watts per square meter (W/m²), denoting the electromagnetic radiation’s power per unit area.

Distance: The intensity of an RF signal diminishes as it travels away from its source, adhering to the inverse square law (1/r²). Essentially, this signifies that the signal’s intensity reduces by fourfold when the distance is doubled.

Obstacles: The existence of barriers may additionally weaken the RF signal, diminishing its power intensity.

FCC Guidelines: The Federal Communications Commission (FCC) has outlined regulations regarding the highest permissible power density thresholds across different frequency ranges. An illustration of this can be found in FCC Rule §1.1307(b)(3), which dictates that in regions open to the public, the power density at UHF channels should not surpass 5% of the prescribed power density exposure limit designated for the specific transmitter.

Applications: RF Power Density finds application across various fields such as wireless communication, radar technology, and medical equipment. Its significance lies in its pivotal role during the development and implementation phases of these systems, guaranteeing both their safety and efficiency.


In essence, RF Power Density represents the power per unit area of electromagnetic radiation. Its significance lies in assessing the safety of exposure to such radiation, evaluating antenna performance, and determining the coverage range of wireless communication setups.

Utilizing the input voltage and current data, compute real power and volt-ampere reactive (VAR) with ease. This calculator can be used to find the real power and reactive power in both single-phase and three-phase power systems.

Note : Don’t end with comma ( , )

Input Power (P)
Power Gain (G)
Distance to the Center of Antenna (R)


\[S = \frac{P⋅G}{4⋅π⋅R^2}\]


  • S = Power Density
  • P = Power Input
  • G = Power Gain
  • R = Distance to the Center of Antenna
  • PI = 3.14

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