The calculator converts from conducted power (EIRP) at the output of the transmitter in dBm to dBuV/m.
Typically this measurement is made at 3 meters for the purposes of FCC testing. However you can specify any distance in the calculator.
dBuV/m to dBmUse this calculator to determine if you will pass the FCC limit test by making a measurement of the transmit power (EIRP) at the RF IN/OUT port of your device.
For example if the FCC limit is specified to be 55 dBuV/m at a 3m distance, then the maximum EIRP is not to exceed -40.2 dBm.
Note that there is usually a frequency dependence to this limit (i.e. the limit will vary with frequency) so the EIRP should be taken account based on this.