Humidity Ratio Calculator
Calculate humidity ratio and moisture content from temperature and relative humidity per ASHRAE standards.
Comfort Zone Reference
| Condition | Humidity Ratio | Grains/lb |
|---|---|---|
| Minimum Comfort | 0.004 | 28 |
| ASHRAE Summer | 0.012 | 84 |
| Maximum Comfort | 0.016 | 112 |
| Saturation at 55F | 0.009 | 63 |
Formulas Used
Humidity Ratio: W = 0.622 x Pw / (Patm - Pw)
Enthalpy: h = 0.240 x T + W x (1061 + 0.444 x T)
Specific Volume: v = 0.370486 x (T + 459.67) x (1 + 1.6078 x W) / Patm