Fairview Microwave's EIRP Calculator determines the radiated power given the transmitter power, the cable loss to the antenna, and the gain of the antenna.
EIRP, or effective isotropically radiated power, or equivalent isotropically radiated power, is a measurement of output power in one direction from an ideal, one dimensional source. The ideal point-source radiates electromagnetic energy in a spherical pattern, so the "maximum" radiated power should be the same in all directions.
**Note: Like our EIRP calculator, all of our RF calculators allow SI prefix input. For example, if you wish to input "25000000", just type "25M" instead. See the quick-reference table below for all compatible SI prefixes.