Enter the antenna dimension (m) and the wavelength of signal (m) into the Near Field Distance Calculator. The calculator will evaluate the Near Field Distance.

## Near Field Distance Formula

The following two example problems outline the steps and information needed to calculate the Near Field Distance.

NFD = 2*d^2/WL

Variables:

- NFD is the Near Field Distance (m)
- d is the antenna dimension (m)
- WL is the wavelength of signal (m)

To calculate the near field distance, square the antenna dimension, multiply by 2, then divide by the wavelength of the signal.

## How to Calculate Near Field Distance?

The following steps outline how to calculate the Near Field Distance.

- First, determine the antenna dimension (m).
- Next, determine the wavelength of signal (m).
- Next, gather the formula from above = NFD = 2*d^2/WL.
- Finally, calculate the Near Field Distance.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

antenna dimension (m) = .25

wavelength of signal (m) = 3

NFD = 2*d^2/WL** **= ?