Calculate dew point temperature, wet bulb temperature, absolute humidity and comfort level from air temperature and relative humidity. Uses Magnus formula. Pure frontend, no server uploads.
🌡️ Input Parameters
📊 Results
📖 What Can This Dew Point Calculator Do?
The Dew Point Calculator uses the Magnus formula to compute dew point temperature, wet bulb temperature, and absolute humidity from air temperature and relative humidity. It also assesses comfort level and condensation risk. Ideal for HVAC design, building moisture assessment, and meteorological analysis.
Key Features
- Dew Point Temperature: Precise calculation using the Magnus formula (°C and °F)
- Wet Bulb Temperature: Estimated for evaporative cooling assessment
- Absolute Humidity: Calculates water vapor content in g/m³
- Comfort Assessment: Grades perceived comfort based on dew point
- Condensation Prediction: Input surface temperature to check for condensation risk
How to Use
- Enter temperature: Input current air temperature in Celsius (-40 to 50°C).
- Enter humidity: Input relative humidity percentage (0-100%).
- Enter surface temperature (optional): Input the surface temperature for condensation prediction.
- View results: Results update in real-time showing dew point, wet bulb, comfort, etc.
- Copy/Download: Click copy or download to save results.
Use Cases
HVAC System Design
AC systems need dew point data to set dehumidification targets for indoor comfort.
Building Moisture Assessment
Evaluate condensation risk on walls, windows, and pipes to prevent mold and structural damage.
Meteorological Analysis
Weather enthusiasts analyze humidity conditions to predict fog, dew, and other phenomena.
Industrial Process Control
Control environmental humidity in coating, drying, and storage based on dew point to ensure product quality.
Background Knowledge
The Magnus formula: α=(T×17.625)/(T+243.04), then Td=(243.04×(ln(RH/100)+α))/(17.625-ln(RH/100)-α). Wet bulb temperature uses the Stull approximation. Absolute humidity: AH=216.7×(RH/100×6.112×e^(17.62×T/(T+243.04))/(T+273.15)).
FAQ
What is dew point temperature?
Dew point is the temperature at which air becomes saturated (100% RH) at constant pressure. Below this temperature, water vapor condenses into dew, fog, or clouds.
What formula is used?
The Magnus formula, valid for -40°C to 50°C, one of the most widely used empirical dew point formulas in meteorology.
How does dew point relate to comfort?
Below 10°C feels dry, 12-16°C comfortable, 16-20°C slightly humid, 20-24°C muggy, above 24°C extremely uncomfortable.
How to predict condensation?
When surface temperature is below the dew point, condensation occurs. Input surface temperature to check.
Dew point vs relative humidity?
RH changes with temperature while dew point is an absolute moisture measure. Dew point is more stable and reliable.