RF EIRP Calculator dBm / W
EIRP (dBm) = Tx power (dBm) + Antenna gain (dBi) – cable loss (dB)
EIRP Calculator – Effective Isotropic Radiated Power
The EIRP Calculator helps you determine the total radiated power of a transmitter system after considering antenna gain and transmission losses. EIRP (Effective Isotropic Radiated Power) is a critical parameter in RF planning, telecom network design, satellite communication, and wireless system analysis.
Whether you are working in LTE, 5G, microwave links, or Wi-Fi deployment, calculating EIRP ensures regulatory compliance and proper coverage planning.
What is EIRP?
Effective Isotropic Radiated Power (EIRP) represents the total power radiated by an antenna in a specific direction compared to an ideal isotropic antenna.
It includes:
- Transmitter output power
- Antenna gain
- Cable/connector losses
EIRP tells us how strong the signal effectively radiates into space.
EIRP Formula
$$ \text{EIRP (dBm)} = \text{Tx Power (dBm)} + \text{Antenna Gain (dBi)} - \text{Cable Loss (dB)} $$
$$ \text{EIRP (W)} = 10^{\frac{\text{EIRP(dBm)} - 30}{10}} $$
EIRP (dBm) = Tx Power (dBm) + Antenna Gain (dBi) - Cable Loss (dB)
How to Use EIRP Calculator
- Enter Transmitter Power (in dBm, W, or mW)
- Enter Antenna Gain (in dBi)
- Enter Cable Loss (in dB)
- Add optional extra losses if needed
- Click calculate to get EIRP in dBm and Watts
EIRP Calculation Example
Let’s calculate EIRP with real values:
- Transmitter Power = 30 dBm
- Antenna Gain = 6 dBi
- Cable Loss = 2 dB
EIRP = 30 + 6 - 2 = 34 dBm
Convert to watts:
EIRP ≈ 2.51 Watts
What is EIRP in Telecom?
Effective Isotropic Radiated Power (EIRP) is the total power radiated by an antenna in a specific direction, compared to an ideal isotropic radiator.
It is a key parameter used in:
- 5G and LTE network planning
- Wi-Fi signal strength analysis
- Satellite communication systems
- RF link budget calculations
FAQ on EIRP Calculator
A good EIRP depends on the application. For Wi-Fi, it is usually below regulatory limits, while telecom networks use higher values for better coverage.
EIRP in dBm represents the effective radiated power in logarithmic scale, combining transmitter power, antenna gain, and losses.
EIRP = Transmitter Power (dBm) + Antenna Gain (dBi) − Cable Loss (dB)
Antenna gain focuses energy in a direction, increasing effective radiated power compared to an isotropic antenna.
EIRP is referenced to an isotropic antenna, while ERP is referenced to a dipole antenna (ERP is ~2.15 dB lower than EIRP).