WBGT Heat Stress Calculator

Calculate Wet Bulb Globe Temperature (WBGT) for occupational heat stress assessment with OSHA/NIOSH threshold limits and work/rest cycle recommendations.

OSHANIOSHACGIH TLV
Heat Stress Assessment
Enter temperature measurements and work conditions to calculate WBGT and assess heat stress risk.

Temperature Measurements

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)

Environment Type

Select whether the work area has direct solar exposure

Work Conditions

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)

Clothing Adjustment

Add adjustment for protective clothing (WBGT increases with heavier PPE)