WBGT Calculator
Free WBGT calculator using ISO 7243 standards. Calculate workplace heat stress, flag conditions, and work-rest cycles for outdoor and indoor environments.
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Calculate WBGT for Heat Stress Assessment
Wet Bulb Globe Temperature (WBGT) is the gold standard for assessing heat stress risk in outdoor and indoor environments. Used by the military, OSHA, and sports organizations worldwide, WBGT combines air temperature, humidity, wind, and radiant heat to provide a comprehensive heat stress index.
What Is WBGT?
WBGT (Wet Bulb Globe Temperature) is a composite temperature measurement that accounts for multiple environmental factors affecting heat stress: air temperature, humidity, wind speed, and solar radiation. It's more accurate than heat index alone because it considers radiant heat from the sun and cooling from wind.
WBGT Formulas
Outdoor: WBGT = 0.7×Tw + 0.2×Tg + 0.1×Td | Indoor: WBGT = 0.7×Tw + 0.3×TgWhy Calculate WBGT?
Workplace Safety
OSHA and NIOSH recommend WBGT for assessing occupational heat exposure.
Athletic Safety
Sports organizations use WBGT to determine safe practice conditions.
Military Training
Armed forces worldwide use the flag system to regulate training intensity.
How to Use This Calculator
Common Applications
Construction Sites
Monitor conditions for outdoor workers to prevent heat illness.
Sports & Athletics
Football, soccer, and other sports use WBGT for practice safety protocols.
Military Training
Determine flag conditions and mandatory work-rest cycles for troops.
Industrial Settings
Factories and warehouses with heat exposure use WBGT for safety compliance.
Frequently Asked Questions
White (78-82°F): Unrestricted activity. Green (82-85°F): Use discretion. Yellow (85-88°F): Limit strenuous activity. Red (88-90°F): Suspend intense activity. Black (>90°F): Cancel outdoor exertion.