Natural wet bulb temperature measured with a thermometer wrapped in wet wick exposed to natural air movement (°C)
Temperature measured with a 150mm matte black sphere thermometer (°C)
Select whether the work area has direct solar exposure
Walking, moderate lifting, driving heavy vehicles
60 min work / 0 min rest per hour
Are workers acclimatized to heat? (5-7 days of gradual exposure)
Add adjustment for protective clothing (WBGT increases with heavier PPE)
Common questions about this calculator