Weather tools
Wet Bulb and Dry Bulb to Relative Humidity
Calculates the relative humidity using the readings from a wet-bulb thermometer and a dry-bulb thermometer, which together measure the cooling effect of evaporation.
Before you use this tool
Use this if
- Calculates the relative humidity using the readings from a wet-bulb thermometer and a dry-bulb thermometer, which together measure the cooling effect of evaporation.
- You want a calculation that exposes its formula: Relative Humidity ≈ 100 - (((Dry Bulb Temperature - Wet Bulb Temperature) × 5) / 3)
- You already have Dry Bulb Temperature, Wet Bulb Temperature 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 using the readings from a wet-bulb thermometer and a dry-bulb thermometer, which together measure the cooling effect of evaporation.
- You want a calculation that exposes its formula: Relative Humidity ≈ 100 - (((Dry Bulb Temperature - Wet Bulb Temperature) × 5) / 3)
- You already have Dry Bulb Temperature, Wet Bulb Temperature 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.