ERP and EIRP calculator
EIRP and ERP calculator: the difference between them, dBi to dBd conversion, cable and connector losses, and the effective area of the antenna.
Safe distance from an antenna calculator
RF exposure calculator — safe distance from an antenna under ICNIRP and the Ukrainian DSanPiN limits, time averaging and the far-field boundary.
mW to dBm converter
mW to dBm converter — power in milliwatts to dBm and back, with a reference table of typical levels from receiver sensitivity to transmitter output.