EIRP and ERP Power Calculator

Calculate antenna power, EIRP and ERP after feedline loss and antenna gain.

RF power, EIRP & ERP

Allow for feedline loss and antenna gain.

Estimated EIRP--

About this calculator

How to use it

Enter transmitter power, total feedline loss and antenna gain in dBi to estimate radiated power.

Understanding the result

Check licence limits using the correct EIRP or ERP definition for the band and service. Include every cable, connector and inline device loss.

More ham radio calculators

Watts to dBm and dBm to Watts Converter Free-Space Path Loss and Link Budget Calculator Fresnel Zone Clearance Calculator Radio Horizon and Line-of-Sight Calculator Maidenhead Locator Distance and Bearing Calculator Ohm's Law Calculator

View all 24 radio tools

Planning estimate

Use this calculator as a practical starting point. Check critical radio, electrical and installation work with suitable test equipment and current licence requirements.