Enter your relative humidity, temperature, or dew point and visibility into the calculator to determine the fog density.

Fog Density Calculation Formula

The following formula is used to calculate the fog density from your inputs.

Fog Density = (Humidity / 100) * (0.611 * exp((17.27 * Temperature) / (Temperature + 237.3)))

Variables:

  • Fog Density is the fog concentration (g/m³)
  • Humidity is the relative humidity (%)
  • Temperature is the air temperature (°C)

To calculate the fog density, multiply the relative humidity by the saturation vapor pressure, which is a function of temperature, and convert it to fog density.

What is Fog Density Calculation?

Fog density calculation refers to the process of determining the concentration of water droplets in fog. This involves understanding the relative humidity, temperature, and dew point. Proper fog density calculation helps in various fields like meteorology, transportation, and aviation, ensuring accurate weather predictions and safe travel conditions.

How to Calculate Fog Density?

The following steps outline how to calculate the fog density using the given formula.

  1. First, determine your relative humidity and temperature.
  2. Next, apply the formula: Fog Density = (Humidity / 100) * (0.611 * exp((17.27 * Temperature) / (Temperature + 237.3))).
  3. Calculate the fog density by plugging in the values.
  4. If using the advanced calculator, input the dew point and visibility.
  5. Use the formula for advanced calculation: Fog Density = (0.1 * exp(dewPoint)) / visibility.
  6. 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.

Relative Humidity = 80%

Temperature = 15°C

Dew Point = 10°C