💧 Dew Point Calculator

📖 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

1. Enter temperature: Input current air temperature in Celsius (-40 to 50°C).
2. Enter humidity: Input relative humidity percentage (0-100%).
3. Enter surface temperature (optional): Input the surface temperature for condensation prediction.
4. View results: Results update in real-time showing dew point, wet bulb, comfort, etc.
5. 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