Eirp Calculator - Free Online Tool

Effective Isotropic Radiated Power (EIRP) is the measure of power density that would be radiated if all transmitted power were emitted uniformly in all directions. Our calculator streamlines this complex calculation, which fundamentally involves accounting for three key components: transmitter output power, cable losses, and antenna gain.

The core principle is straightforward: EIRP = Transmit Power + Antenna Gain - Total Cable/System Losses. You enter your nominal transmit power (e.g., 20 dBm), input the measured or calculated loss from cables and connectors (often expressed in dB), and finally, specify the antenna's gain (in dBi). The tool automatically performs the necessary logarithmic arithmetic to provide an accurate EIRP value.

For example, if your transmitter outputs 25 dBm, the cable loss is 3.5 dB, and the antenna has a gain of 15 dBi, the tool calculates the final EIRP as approximately 36.5 dBm. This rapid calculation ensures your link budget analysis remains accurate and efficient.

To maximize the accuracy of your EIRP calculations, treat this tool as part of a comprehensive link budget analysis. Do not rely on a single calculation run; test multiple operational scenarios.

• Worst-Case Modeling: Always calculate the EIRP under the worst-case conditions (e.g., maximum expected temperature affecting cable performance, or minimum required signal strength).
• Component Variation: If you are using multiple components, consider adding a safety margin of 3 dB to account for component tolerance and aging over time.
• Frequency Dependence: Understand that cable loss is frequency-dependent. If your system operates across a wide band (e.g., 2 GHz to 6 GHz), use the maximum predicted loss at the highest operating frequency.

By systematically testing these variables, you move from simple calculation to robust, real-world engineering design.