What is WBGT?

WBGT (Wet Bulb Globe Temperature) is a measure used to estimate the effect of temperature, humidity, wind speed, and solar radiation on humans. It is particularly useful for assessing the risk of heat stress in various environments, especially in occupational settings where workers may be exposed to hot conditions.

WBGT takes into account not just the air temperature, but also how other factors contribute to how hot it feels and how the body responds to heat.

How to use the WBGT Calculator?

1. Input Environmental Data

Enter the air temperature in degrees Celsius.

Input the relative humidity as a percentage.

Provide the wind speed in meters per second.

Enter the solar radiation in watts per square meter.

2. Select Environmental Conditions

Choose whether the calculation is for an indoor or outdoor environment.

This selection affects the WBGT calculation formula used.

3. Specify Clothing Level

Select the appropriate clothing level: light, medium, or heavy.

This factor influences the body’s ability to cool itself.

4.  Indicate Workload

Choose the workload intensity: light, moderate, heavy, or very heavy.

The workload affects how much heat the body generates during activity.

5. Calculate WBGT

Click the “Calculate WBGT” button to process the inputs. The calculator will display the WBGT value in degrees Celsius.

It will also provide a risk level assessment: Low, Moderate, High, Very High, or Extreme.

An explanation of the risk level and recommended precautions will be shown.

The tool uses these inputs to calculate the Wet Bulb Temperature and Globe Temperature, which are then combined to determine the WBGT. The risk level is initially based on the WBGT value alone, but is then adjusted based on the clothing level and workload intensity. This provides a more comprehensive assessment of the heat stress risk.

Users should note that while this calculator provides a good estimate of heat stress risk, it should not replace professional judgment or more detailed on-site measurements. Factors such as individual health conditions, acclimatization to heat, and specific work environments can all influence how a person responds to heat stress.

This tool is particularly useful for occupational health and safety professionals, sports event organizers, and anyone planning activities in potentially hot environments. By regularly monitoring WBGT and adjusting activities accordingly, users can help prevent heat-related illnesses and ensure safer working or recreational conditions in hot weather.