Humidity grains per pound calculator

How to use the calculator

1. Enter the temperature in degrees Fahrenheit (°F).
2. Enter the relative humidity percentage (%).
3. Click the "Calculate" button to compute the humidity in grains per pound.
4. The result will be displayed in the "Humidity (grains per pound)" field.

Working Principle

The calculator uses the following formula to calculate the humidity in grains per pound based on temperature and relative humidity:

Humidity (grains per pound) = 621.97 * (0.6108 * exp(17.62 * temperature / (temperature + 243.12)) * relativeHumidity / 100)

This formula is derived from the psychrometric properties of moist air and is widely used in HVAC and meteorology to determine the amount of water vapor in the air.

Example

If the temperature is 75°F and the relative humidity is 50%, the humidity in grains per pound would be:

Humidity (grains per pound) = 621.97 * (0.6108 * exp(17.62 * 75 / (75 + 243.12)) * 50 / 100) ≈ 65.32 grains per pound