Online Dipole Calculator: Calculate Dipole Antenna Dimensions for Frequency & Diameter


The Dipole Calculator is a tool used for calculating various parameters of a dipole antenna. A dipole antenna is a simple antenna design consisting of two conductive elements, typically wires or rods, that are symmetrically aligned and fed with a radio frequency signal. The Dipole Calculator assists in determining the antenna length, dipole leg length, wavelength, and other related values.


The Dipole Calculator is employed by radio frequency engineers, antenna designers, amateur radio enthusiasts, and anyone involved in the construction or analysis of dipole antennas. It helps users determine the dimensions of a dipole antenna based on the desired frequency of operation, or conversely, calculates the frequency of operation based on the known dimensions.


  1. Frequency (MHz): This parameter represents the desired or known operating frequency of the dipole antenna, measured in megahertz (MHz). The frequency determines the wavelength and, consequently, affects the dimensions of the dipole antenna.

  2. Diameter (mm): The diameter parameter refers to the size of the conductive elements of the dipole antenna, usually expressed in millimeters (mm). It represents the thickness or width of the wire or rod used for constructing the antenna.


  • Antenna Length (L) (cm): This result represents the total length of the dipole antenna, measured in centimeters (cm). It is the sum of both dipole legs.

  • Dipole Leg Length (l) (cm): This result indicates the length of a single dipole leg, measured in centimeters (cm). Each leg extends from the center feed point to the outer end of the conductive element.

  • Wavelength (m): The wavelength parameter represents the distance between two consecutive peaks or troughs of a radio wave. It is measured in meters (m) and is calculated using the formula: Wavelength (m) = Speed of Light (m/s) / Frequency (Hz).

  • ½ Wavelength (m): The ½ wavelength is half the value of the full wavelength and is measured in meters (m). It is calculated as 0.5 times the wavelength.

  • ¼ Wavelength (m): The ¼ wavelength is one-fourth of the full wavelength and is measured in meters (m). It is calculated as 0.25 times the wavelength.

  • Adjustment Factor (k): The adjustment factor represents a correction factor applied to the dipole antenna length to account for various factors such as end effects, proximity to the ground, and dielectric effects. It is a dimensionless value that can vary depending on the specific conditions and requirements of the antenna design.

Math Equations:

To calculate the wavelength (λ) based on the frequency (f), the following formula is used: Wavelength (m) = Speed of Light (m/s) / Frequency (Hz)

The dipole antenna length (L) can be calculated using the formula: L (m) = (Wavelength (m) / 2) * Adjustment Factor (k)

To convert the dipole length to centimeters (cm), the formula is: L (cm) = L (m) * 100

The dipole leg length (l) can be obtained by dividing the total antenna length by 2: l (cm) = L (cm) / 2

It's important to note that the adjustment factor (k) may vary depending on the specific design considerations and circumstances. Different sources and design methodologies might suggest various adjustment factors to account for different factors influencing the antenna's performance.

The Dipole Calculator simplifies the process of determining the dimensions of a dipole antenna, making it a valuable tool for antenna design and analysis.


It is believed that these calculations are accurate, but not guaranteed. Use at your own risk!