This calculator converts **Power** in dBm at a receiver input to **Field Intensity** deciBels-microVolt-Per-Meter (dBuV/m) at the antenna.

The tool is useful when a measurement is made using a calibrated spectrum analyzer or receiver (in dBm) with an antenna connected to its input port. It provides the field strength in dBuV/m at the antenna.

This tool requires as input

- Power at the input to the receiver (dBm)
- Impedance (ohm)
- Antenna gain (dBi)
- Frequency of operation (Hz)

## Formula

**AF = 20*Log _{10}(9.73/(λ√G))**

** V _{dBμV} = P_{dBm} + 10*Log_{10}(Z) + 90**

** E _{dBμV/m} = V_{dBμV} + AF_{dB/m} **

## Example Calculation

For

- Input power of -60 dBm,
- Input impedance of 50 ohm,
- Antenna gain of 3 dBi,
- Frequency = 1000 MHz

The field intensity is calculated to be 74.25 dBuV/m.