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Wet Bulb Calculator
Enter dry-bulb air temperature and relative humidity to estimate wet-bulb temperature and dew point. Choose °C or °F. Results use RapidRatio’s decimal-first helpers—overview in why readable decimals matter.
Calculate wet-bulb temperature
Results
| Wet-bulb temperature | — |
|---|---|
| Dew point | — |
What is wet-bulb temperature?
Wet-bulb temperature is the lowest temperature air can reach when water evaporates into it under constant pressure—a core idea in psychrometrics and moist-air thermodynamics. It combines the effects of dry heat and humidity and appears in weather analysis, HVAC design, and physics labs.
- Dry-bulb — ordinary air temperature from a standard thermometer.
- Relative humidity — how much moisture the air holds compared with saturation at that temperature, expressed as a percent.
- Wet-bulb — always at or below dry-bulb for unsaturated air; equals dry-bulb when RH = 100%.
- Dew point — temperature at which air becomes saturated and condensation begins.
Units, rounding, and limits
Choose °C or °F for input and output. Displayed temperatures use two decimal places. The wet-bulb estimate follows a common published approximation for typical indoor and outdoor ranges; extreme combinations may be less accurate. This model assumes standard atmospheric conditions and does not replace calibrated psychrometers or laboratory instruments.
FAQ
What is wet-bulb temperature?
Wet-bulb temperature is the lowest temperature air can reach by evaporating water into it at constant pressure. It reflects both heat and humidity and is used in psychrometrics, thermodynamics, weather, and HVAC.
What inputs does this calculator need?
Enter dry-bulb air temperature and relative humidity in percent. Choose Celsius or Fahrenheit for display. The tool returns approximate wet-bulb and dew-point temperatures in the same unit.
How accurate is the wet-bulb estimate?
This tool uses a published approximation suited to typical outdoor and indoor ranges. It is not a substitute for calibrated psychrometers or professional laboratory measurements.