Effective Radiated Power Calculator

This calculator helps you determine the effective radiated power (ERP) of an antenna system based on its transmit power and gain.

Input Parameters

Calculation Results

Calculation Formula

ERP = PT × 10(G/10)

Where:
ERP = Effective Radiated Power
PT = Transmit Power
G = Antenna Gain in dBi

Result

Effective Radiated Power (ERP) =

Effective Radiated Power Calculator Usage Guide

Learn how to use the Effective Radiated Power Calculator and understand its working principles

What is Effective Radiated Power (ERP)?

Effective Radiated Power (ERP) is a measure of the power that an antenna radiates in a given direction. It represents the power that would be needed at the transmitter to produce the same field strength at a distance of 1 mile (1.6 km) from the antenna, assuming the same antenna gain.

How to Use This Calculator

  1. Enter the Transmit Power in Watts. This is the power output from your transmitter.
  2. Enter the Antenna Gain in dBi. This is the gain of your antenna compared to a half-wave dipole antenna, measured in decibels.
  3. Click the Calculate button to compute the ERP.
  4. The result will be displayed in Watts.

Understanding the Formula

The calculation is based on the formula:

ERP = PT × 10(G/10)

Where:

  • ERP = Effective Radiated Power in Watts
  • PT = Transmit Power in Watts
  • G = Antenna Gain in dBi

Practical Applications

ERP is commonly used in:

  • Radio communication systems to specify coverage area
  • Wireless network planning
  • Television broadcasting
  • Cellular networks

Example

If you have a transmitter with 50 Watts of power and an antenna with 10 dBi gain, the ERP would be:

ERP = 50 × 10(10/10) = 50 × 10 = 500 Watts