METEOROLOGY – URFACE TEMPERATURE & THERMAL COMFORT CALCULATOR
Wbgt Index
A precise tool.
What is the Wbgt Index & How does it work?
The Wet Bulb Globe Temperature (WBGT) index is a measure used to assess the thermal stress experienced by humans in hot environments. It takes into account air temperature, radiant heat from the sun, and humidity.
WBGT is calculated using the formula: WBGT = 0.7 times T_{wb} + 0.2 times T_{g} + 0.1 times T_{a}, where T_{wb} is the wet bulb temperature, T_{g} is the globe temperature, and T_{a} is the air temperature.
WBGT is calculated using the formula: WBGT = 0.7 times T_{wb} + 0.2 times T_{g} + 0.1 times T_{a}, where T_{wb} is the wet bulb temperature, T_{g} is the globe temperature, and T_{a} is the air temperature.
WBGT = 0.7 times T_{wb} + 0.2 times T_{g} + 0.1 times T_{a}
T_{wb} = Wet Bulb Temperature (°C)
T_{g} = Globe Temperature (°C)
T_{a} = Air Temperature (°C)
T_{g} = Globe Temperature (°C)
T_{a} = Air Temperature (°C)
Parameters
Result
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Frequently Asked Questions
What is the WBGT index?
The Wet Bulb Globe Temperature (WBGT) index measures thermal stress experienced by humans in hot environments, considering air temperature, radiant heat from the sun, and humidity.
How do you calculate the WBGT index?
WBGT is calculated using the formula: WBGT = 0.7 × T_{wb} + 0.2 × T_{g} + 0.1 × T_{a}, where T_{wb} is wet bulb temperature, T_{g} is globe temperature, and T_{a} is air temperature.
What do the weights in the WBGT formula represent?
The weights in the WBGT formula (0.7 for wet bulb temperature, 0.2 for globe temperature, and 0.1 for air temperature) reflect their relative contributions to thermal stress.
When is the WBGT index useful?
The WBGT index is useful in assessing heat stress levels in outdoor workers, athletes, or anyone exposed to hot environments.
What are the thresholds for different WBGT levels?
WBGT thresholds vary by organization but generally include: 26°C – 30°C (caution), 30°C – 32°C (warning), and above 32°C (danger).
How does humidity affect the WBGT index?
Humidity increases the WBGT index because it affects the wet bulb temperature, which is a key component in the calculation.
Can I use this calculator for indoor environments?
While the WBGT index is primarily used for outdoor environments, it can be adapted for indoor settings with similar considerations of air temperature and humidity.
Results are for informational purposes only and do not constitute professional advice.