Amateur Radio RF Safety Calculator

Calculate Radio Frequency Power Density
What is the average power at the antenna:
In watts

What is the distance to the area of interest:
From the center of the antenna, in feet

What is the antenna gain in dBi:
Enter 2.2 for dipoles; add 2.2 for antennas rated in dBd

What is the frequency of operation:
In MHz

Ground Reflection Effects
In most cases, the ground reflection factor is needed to provide a truly worst-case estimate of the compliance distance in the main beam of the antenna. Including the ground reflection effects may yield more accurate results especially with very low antennas, non-directional antennas, and calculations below the main lobe of directional antennas.

Do you wish to include effects of ground reflections?

RF Safety Links

- ARRL's RF Safety News page
- FCC's Second Memorandum and Order page
- FCC's OET Bulletin No. 65 page for details on exemptions.
- U of T's categorical exemptions page.