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Convert between relative, absolute, mixing ratio, and specific humidity values.
Humidity conversion translates between relative humidity (%), absolute humidity (g/m³), mixing ratio (g/kg), and specific humidity (g/kg), requiring temperature as a reference input.
| Climate | RH | Absolute |
|---|---|---|
| Desert / Arid | 10–30% | 2–6 g/m³ |
| Mediterranean | 30–60% | 5–12 g/m³ |
| Temperate | 50–70% | 6–15 g/m³ |
| Tropical | 70–90% | 15–25 g/m³ |
| Equatorial Rainforest | 80–100% | 20–30 g/m³ |
Formula
AH = (217 × e) / (T + 273.15), where e = (RH / 100) × 6.112 × e^(17.67T / (T + 243.5))AH = Absolute humidity in g/m³
e = Actual vapor pressure in hPa
T = Air temperature in °C
RH = Relative humidity (%)
Worked Example
60% RH at 25°C
Did you know? The highest absolute humidity on Earth occurs in the Persian Gulf region, where values can exceed 30 g/m³ — nearly saturating the air at over 50°C (source: WMO).
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