Relative Humidity Calculator using Dry and Wet Bulb Temperature

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 Use this free Relative Humidity Calculator to quickly determine the relative humidity percentage using Dry Bulb Temperature and Wet Bulb Temperature readings. This calculator is suitable for both Fahrenheit (°F) and Celsius (°C) temperature scales and can be used with standard hygrometers and whirling (sling) hygrometers.

Hygrometer Dry and Wet Bulb

Introduction

  • Simply enter the Dry Bulb Temperature and Wet Bulb Temperature values, and the calculator will instantly calculate the Relative Humidity (%RH). This tool is useful for HVAC technicians, building automation engineers, facility managers, students, laboratory personnel, and anyone working with environmental measurements.

In addition to the Relative Humidity Calculator, this page also includes:

  1. Celsius (°C) to Fahrenheit (°F) Converter
  2. Fahrenheit (°F) to Celsius (°C) Converter

  • Whether you are checking indoor air conditions, HVAC system performance, industrial processes, or weather-related measurements, this calculator provides a fast and convenient way to determine relative humidity from dry bulb and wet bulb temperatures.
  • This simplified relative humidity calculator provides an approximate relative humidity value. For precise calculations, engineers use psychrometric charts or digital calculators.

👇Fahrenheit (°F)

📋 Relative Humidity Calculator (°F)

  1. Enter the Dry Bulb Temperature (°F) in the input box. 
  2. Enter the Wet Bulb Temperature (°F) in the input box. 
  3. Click the Calculate button.
  4.  The calculated Relative Humidity (%) value will be displayed in the result section.

Relative Humidity Calculator







Result: 0% RH


Note: This formula is only applicable for using the Fahrenheit (°F) hygrometer.

👇Celsius (°C)

📋 Relative Humidity Calculator (°C)

  1. Enter the Dry Bulb Temperature (°C) in the input box. 
  2. Enter the Wet Bulb Temperature (°C) in the input box. 
  3. Click the Calculate button. 
  4. The calculated Relative Humidity (%) value will be displayed in the result section.

Relative Humidity Calculator (°C)







Result: 0% RH


Note: This formula is only applicable for using the Celsius (°C) hygrometer.

👇 °F to °C Calculator
  • Enter a Fahrenheit (°F) temperature value in the input box and click Convert. The equivalent Celsius (°C) temperature will be displayed instantly.

Fahrenheit (°F) to Celsius (°C) Calculator





 
👇°C to °F Calculator
  • Enter a Celsius (°C) temperature value in the input box and click Convert. The equivalent Fahrenheit (°F) temperature will be displayed instantly.

Celsius (°C) to Fahrenheit (°F) Calculator





Conclusion

  • The Relative Humidity Calculator provides a simple and accurate method for calculating humidity levels from Dry Bulb and Wet Bulb Temperature readings. Designed for use with both hygrometers and whirling hygrometers, this tool supports Fahrenheit (°F) and Celsius (°C) measurements, making it suitable for HVAC, building automation, environmental monitoring, Textile, laboratories, and educational applications.
  • Use the built-in temperature conversion calculators to quickly switch between Celsius and Fahrenheit values and obtain reliable humidity calculations whenever needed.

About the Author – Insight Control System

  • Insight Control System provides technical education and practical guidance in the fields of Building Automation Systems (BAS), HVAC controls, PLC programming, sensors, and industrial automation. 
  • The content published on this platform is based on field experience, technical documentation analysis, and real-world system applications.
  • Our objective is to simplify complex automation concepts for engineers, technicians, students, and industry professionals worldwide.
  •  Every article is carefully structured to deliver accurate technical knowledge, practical insights, and industry-relevant information aligned with modern automation standards.
  • We continuously update our content to reflect current technologies, control strategies, and best engineering practices.
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