Enter the visibility distance and light intensity into the calculator to determine the fog factor. This calculator helps to assess the level of fog and its impact on visibility.

## Fog Factor Formula

The following formula is used to calculate the fog factor:

FF = V * sqrt(LI)

Variables:

- FF is the fog factor
- V is the visibility distance (meters)
- LI is the light intensity (candelas)

To calculate the fog factor, multiply the visibility distance by the square root of the light intensity.

## What is a Fog Factor?

Fog factor is a measure used to quantify the level of fog in terms of visibility and light intensity. It is a useful metric for transportation safety, especially for drivers and pilots, to assess the potential impact of fog on travel conditions. A higher fog factor indicates better visibility conditions despite the presence of fog.

## How to Calculate Fog Factor?

The following steps outline how to calculate the Fog Factor.

- First, determine the visibility distance (V) in meters.
- Next, determine the light intensity (LI) in candelas.
- Next, gather the formula from above = FF = V * sqrt(LI).
- Finally, calculate the Fog Factor (FF).
- 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.

visibility distance (V) = 100 meters

light intensity (LI) = 250 candelas