Wet Bulb Globe Temperature
Calculate the Wet Bulb Globe Temperature (WBGT), the gold standard for heat stress assessment. Provides military/OSHA flag color, work-rest cycles, and hydration guidance.
Inputs
Results
WBGT (Outdoor)
31.5 °C
Heat Flag Color
Red
How to Use This Calculator
- Measure or obtain Dry Bulb Temperature (°C) — standard air temperature in the shade.
- Measure Wet Bulb Temperature (°C) using a sling psychrometer or whirling hygrometer.
- Measure Globe Temperature (°C) using a black globe thermometer in direct sunlight.
- Review WBGT (Outdoor) and Flag Color: Green = low risk, Yellow = moderate, Red = high, Black = extreme.
- Use Work/Rest Cycle and Water per Hour (liters) to set activity guidelines for outdoor workers or athletes.
Related Calculators
Heat Index Deep Calculator
Calculate the heat index using the full Rothfusz regression equation with NWS adjustments. Includes risk assessment and exposure-duration guidance.
Visibility Calculator
Estimate atmospheric visibility from humidity, precipitation rate, and particulate concentration. Provides aviation flight category and driving safety guidance.
Drought Index Calculator
Estimate a Palmer Drought Severity Index (PDSI) category from temperature, precipitation, and soil moisture data. Includes water balance analysis and impact assessment.
Lightning Distance Calculator
Calculate the distance to a lightning strike from the flash-to-bang time delay. Includes temperature-adjusted speed of sound and safety guidance.
Wind Power Density
Calculate wind power density (W/m²) from average wind speed, air density, and Weibull shape factor. Includes NREL wind class and sample turbine output estimates.