RF Wireless 4G & 5G

EIRP and ERP Calculator

How much power does the antenna effectively radiate?

By TheCalcTools Updated Formula checked and tested

Your numbers

dBm

Your results

EIRP (dBm)
EIRP (dBm)
—
EIRP (W)
—
ERP (dBm)
—
Antenna gain (dBd)
—

EIRP and ERP Calculator by TheCalcTools

How the EIRP and ERP Calculator works

Enter the transmitter output power and the total loss before the antenna.

Add the antenna gain in dBi to get EIRP.

ERP refers to a half-wave dipole, which has 2.15 dBi gain, so ERP = EIRP − 2.15 dB.

The formula

EIRP = P_tx − L + G_dBiERP = EIRP − 2.15 dB

Worked example

Using the default values shown in the calculator:

Transmitter power (dBm)46 dBm
Cable, connector and combiner loss (dB)3
Antenna gain (dBi)17.5
  1. EIRP = 46 − 3 + 17.5 = 60.5 dBm = 1,122.0 W.
  2. ERP = 58.4 dBm; antenna gain is 15.35 dBd.

Result:

EIRP (dBm)60.5
EIRP (W)1,122.0
ERP (dBm)58.4
Antenna gain (dBd)15.35

Frequently asked questions

What is the difference between dBi and dBd?

dBi is relative to an isotropic radiator; dBd is relative to a half-wave dipole. dBi = dBd + 2.15.

Does EIRP include the radiation pattern?

It is the peak value in the main-beam direction.

Sources and further reading

Feeder and Jumper Loss CalculatorAdd up the losses between the radio and the antenna LTE / 5G Link Budget and MAPL Calculator (DL and UL)Find which link limits your coverage, uplink or downlink VSWR and Return Loss CalculatorCheck antenna and feeder match from one number RSRP, RSRQ and RSSI CalculatorRSRQ = N × RSRP ÷ RSSI, in dB SINR CalculatorAdd up interference and noise, then see the SINR Thermal Noise and Receiver Sensitivity CalculatorHow weak a signal can the receiver still decode?

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.