Weather tools
Absolute Humidity to Relative Humidity
Calculates the relative humidity from the absolute humidity, which is the actual amount of water vapor in the air per unit volume.
Before you use this tool
Use this if
- Calculates the relative humidity from the absolute humidity, which is the actual amount of water vapor in the air per unit volume.
- You want a calculation that exposes its formula: Relative Humidity ≈ (Absolute Humidity / (216.7 * Saturation Vapor Pressure / (Temperature + 273.15))) * 100
- You already have Absolute Humidity, 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 from the absolute humidity, which is the actual amount of water vapor in the air per unit volume.
- You want a calculation that exposes its formula: Relative Humidity ≈ (Absolute Humidity / (216.7 * Saturation Vapor Pressure / (Temperature + 273.15))) * 100
- You already have Absolute Humidity, 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.