ERP Calculator
Calculate Effective Radiated Power (ERP) from transmitter power, antenna gain, and feed-line loss. Also computes equivalent EIRP and related engineering values.
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Inputs
Live
Math
3
Related
Enter parameters and click Calculate to view results
Formula & Theory
ERP = PT × 10^((GdBd − L)/10), EIRP = ERP + 2.15 dBThis formula is used to calculate antenna parameters for erp calculator.
Overview
ERP helps you calculate design values for a rf conversion project from Transmitter Power, Antenna Gain, Feed-Line Loss. Calculate Effective Radiated Power (ERP) from transmitter power, antenna gain, and feed-line loss. Also computes equivalent EIRP and related engineering values. Use the result to make an informed first design decision before choosing hardware, setting dimensions, or evaluating the RF system in its final environment.
Input Guide
Enter Transmitter Power, Antenna Gain, Feed-Line Loss exactly in the units shown by this erp. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Transmitter Power — use W.
- Antenna Gain — use dBd.
- Feed-Line Loss — use dB.
Output Guide
The results describe the calculated erp values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The ERP uses ERP = PT × 10^((GdBd − L)/10), EIRP = ERP + 2.15 dB. Supply Transmitter Power (W), Antenna Gain (dBd), Feed-Line Loss (dB) in the displayed units, then use the calculated values as the first engineering target for this rf conversion design or analysis.
Design Notes
This rf conversion calculation is based on ERP = PT × 10^((GdBd − L)/10), EIRP = ERP + 2.15 dB. Real-world accuracy depends on factors such as material properties, losses, mounting, nearby conductors, ground interaction, feed-line effects, and construction tolerance. Confirm the final system with measurement or simulation.
Build and Tuning Notes
Apply the erp result as an initial target, then validate it in the intended installation. Keep the physical layout and feed arrangement consistent while testing, change one parameter at a time, and record the measured outcome before making another adjustment.
Frequently Asked Questions
What does the ERP calculate?
Calculate Effective Radiated Power (ERP) from transmitter power, antenna gain, and feed-line loss. Also computes equivalent EIRP and related engineering values. The calculation provides an initial design value based on Transmitter Power (W), Antenna Gain (dBd), Feed-Line Loss (dB).
Which inputs are needed for the ERP?
Enter Transmitter Power (W), Antenna Gain (dBd), Feed-Line Loss (dB) using the displayed units. Each value directly affects the calculated result, so confirm the unit and operating conditions before running the calculation.
How accurate is this erp?
It follows ERP = PT × 10^((GdBd − L)/10), EIRP = ERP + 2.15 dB. It is accurate for the formula assumptions, but installed performance can change because of materials, loss, environment, mounting, nearby objects, and measurement uncertainty.
What should I do after using the ERP?
Compare the result with the practical constraints of your rf conversion system, then validate the completed design with appropriate measurement equipment or simulation.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.