Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Target EIRP (dBm)

Required number input.

Antenna gain (dBi)

Required number input.

Cable loss (dB)

Required number input.

Compute the required transmitter output power in dBm from a target EIRP by subtracting the antenna gain and adding the cable loss. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Transmitter power (dBm)

The resulting transmitter power returned as a number.

• Antenna formulas assume stated frequency, impedance match, polarization, efficiency, aperture, and propagation geometry. Nearby objects, ground, feed loss, multipath, regulatory averaging, near-field conditions, and pattern variation can make free-space or ideal-aperture results inaccurate.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• EIRP Calculator

  Calculate effective isotropic radiated power from transmitter power, antenna gain, and cable loss.

• Gain dB To Linear

  Convert an antenna power gain in decibels to a linear power ratio.

• Linear Gain To dB

  Convert a linear antenna power ratio to an equivalent gain in decibels.