Weather tools
Temperature and Dew Point to Relative Humidity
Calculates the relative humidity, which is the amount of moisture in the air compared to the maximum amount it can hold at a given temperature, using the air temperature and dew point.
Before you use this tool
Use this if
- Calculates the relative humidity, which is the amount of moisture in the air compared to the maximum amount it can hold at a given temperature, using the air temperature and dew point.
- You want a calculation that exposes its formula: Relative Humidity = 100 × (exp((a × Td) / (b + Td)) / exp((a × T) / (b + T))), where Td is Dew Point, T is Temperature, a = 17.27, and b = 237.7
- You already have Temperature, Dew Point values to enter.
Skip this if
- You need an official emergency alert or life-safety instruction.
- You need a certified professional forecast instead of a calculator estimate.
When to use or skip it
Use this if
- Calculates the relative humidity, which is the amount of moisture in the air compared to the maximum amount it can hold at a given temperature, using the air temperature and dew point.
- You want a calculation that exposes its formula: Relative Humidity = 100 × (exp((a × Td) / (b + Td)) / exp((a × T) / (b + T))), where Td is Dew Point, T is Temperature, a = 17.27, and b = 237.7
- You already have Temperature, Dew Point values to enter.
Skip this if
- You need an official emergency alert or life-safety instruction.
- You need a certified professional forecast instead of a calculator estimate.