# Field Strength Calculator (and back)

## Field Strength Calculator

The field strength calculator will calculate Volts per meter (V/m) generated by a transmitter. The strength of the field is based on transmitter power, system loss and antenna gain.

## Transmitter→Field Strength

dB
dB
V/m

This field strength calculator is the reverse of the one above. It will calculate the power required at the transmitter to result in a particular field strength. Power required at the transmitter is based on field strength, system loss and antenna gain.

## Field Strength →Transmitter

V/m
dB
dB

Electromagnetic fields, as the name implies, have an electric field component and a magnetic field component. The two interact with each other in a way described by Maxwell’s equations, each field inspiring the other.

The electric field in front of an antenna is easier to measure than the magnetic field and is used more often to describe the field. The strength of an E (electric) field is expressed in Volts per meter (V/m). A measurement of 1V/m means there is 1 Volt of potential between two points that are one meter apart.

The field in front of an antenna propagates as a wave that can be described and modeled in several ways. One way is to describe it as a simple oscillating field. Another way is to describe it as energy delivered in packets called quanta. Physicists use both methods in their calculations.