A **dipole antenna** is one of the most common and effective antennas used in radio communication.

A dipole antenna length calculator helps you determine the right dimensions for your antenna based on the frequency you intend to use.

**Calculator**

Enter the frequency of operation and the tool will calculate antenna length in the metric systems.

Use the drop down menu to select the units: GHz/MHz/kHz for frequency and m/cm/mm for length.

**Formula**

The total length (**L**) of the dipole antenna in meters is calculated as:

**L = 143 / f **

where** f** is the frequency in MHz.

A dipole antenna is comprised of two arms of equal length

**l = L/2**

**Example Calculations**

**Example 1: Dipole Antenna for 14 MHz**

Letโs say you want to build a dipole antenna for a frequency of **14 MHz**, commonly used in amateur radio. Use the calculator on this page to calculate the length to be **10.21 meters**. That’s the total length. Each leg is **5.1 meters** long

**Example 2: Dipole Antenna for 7 MHz**

Now, letโs calculate the length for a frequency of **7 MHz**. Total dipole length in this case is 20.43 meters. The length of each leg is 10.21 meters.

**What Is a Dipole Antenna?**

A **dipole antenna** is a simple type of antenna that consists of two conductive elements (or “legs”), typically made from wire or metal rods. The total length of the dipole is related to the wavelength of the frequency it is designed to transmit or receive.

A half-wave dipole is the most common type of dipole, where the total length of the antenna is **half the wavelength** of the target frequency. Each leg of the dipole is one-quarter of the wavelength, and this antenna configuration is highly effective at transmitting and receiving signals within its resonant frequency range.

**Why Use a Dipole Antenna Length Calculator?**

The performance of a dipole antenna depends on its length being tuned to the wavelength of the desired frequency. If the antenna is too long or too short, it will not be resonant at the desired frequency, leading to poor signal transmission and reception. A **dipole antenna length calculator** simplifies the process by allowing you to quickly determine the correct length for each leg of the antenna based on the frequency you plan to use.

**Tuning and Real-World Adjustments**

While the formula provides a good starting point, **real-world factors** can affect the performance of your dipole antenna. For example:

**Surrounding objects**, such as buildings or trees, can affect signal reception.**Height above the ground**can change the antennaโs resonance.**Wire thickness**and material can influence the final length.

To account for these factors, you may need to **fine-tune** your antenna after installation. This is typically done by slightly adjusting the length of each leg and using an **SWR meter** or **antenna analyzer** to check the signal performance.