Weather tools
Fire Weather Index (FWI) Calculator
Calculates the Fire Weather Index (FWI), a numerical rating of fire danger based on factors like temperature, humidity, wind speed, and recent rainfall.
Before you use this tool
Use this if
- Calculates the Fire Weather Index (FWI), a numerical rating of fire danger based on factors like temperature, humidity, wind speed, and recent rainfall.
- You want a calculation that exposes its formula: FWI calculation involves complex formulas based on FFMC, DMC, DC, and wind speed. Refer to official FWI documentation for detailed equations.
- You already have Temperature, Relative Humidity, Wind Speed 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 Fire Weather Index (FWI), a numerical rating of fire danger based on factors like temperature, humidity, wind speed, and recent rainfall.
- You want a calculation that exposes its formula: FWI calculation involves complex formulas based on FFMC, DMC, DC, and wind speed. Refer to official FWI documentation for detailed equations.
- You already have Temperature, Relative Humidity, Wind Speed 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.