EIRP Calculator

Calculate Effective Isotropic Radiated Power from transmit power, cable loss, connector loss, and antenna gain.

Transmit Power

dBm

Cable Loss

Connector Loss

Antenna Gain

dBi

Tab to move between fields

EIRP

37.5 dBm

EIRP

5.623 W

EIRP7.5 dBW

Tx Power1 W

Power at Antenna Port27.5 dBm

Total System Loss2.5 dB

Over FCC 36 dBm Limit1.5 dB

How to Use This Calculator

Enter transmit power (dBm) -- the calculator converts to watts automatically.
Set cable loss (dB) and connector loss (dB) between the transmitter and antenna.
Enter antenna gain (dBi).
Review EIRP in dBm, dBW, and watts -- the effective radiated power in the direction of maximum gain.
Verify EIRP complies with FCC Part 15, Part 97, or your applicable regulatory limit.

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Formula

EIRP = Tx Power - Cable Loss - Connector Loss + Antenna Gain

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