Wet Bulb Globe Temperature (WBGT) Calculator for Heat Stress Prevention
Assess workplace heat stress risks and get OSHA-compliant work/rest schedules based on temperature, humidity, work intensity, and other factors to prevent heat-related illnesses using the Wet Bulb Globe Temperature (WBGT) index.
Wet Bulb Globe Temperature (WBGT) Heat Stress Calculator
Example Calculation (Default Values):
Using: Temperature = 85°F, Humidity = 60%, Sun Exposure = Partial, Work Intensity = Moderate, Clothing = Normal
Estimated WBGT ≈ 82.6°F
Work/Rest Schedule: 50% Work / 50% Rest
Heat Stress Assessment Results
Recommendations
- Provide cool drinking water and encourage frequent hydration.
Important Note
This is a simplified calculator for demonstration purposes. For accurate WBGT readings, use a calibrated WBGT meter. Always monitor workers for signs of heat stress regardless of calculated values.
How to interpret the result
This tool estimates heat conditions from the entered weather values. An estimated WBGT is not a measurement of the worker’s actual exposure.
Discussion example
Two crews with the same air temperature can have different heat exposures: one handles light work in shade, while the other wears protective clothing near a radiant heat source. The weather entry alone cannot set one safe work/rest schedule for both.
Before using the result
- Assess the actual work area and task, including radiant heat and protective clothing.
- Plan cooling, water, work and recovery periods, acclimatization, and someone to monitor conditions.
- For suspected heat stroke, call 911, begin rapid cooling, and stay with the person. Do not wait for a thermometer reading or for sweating to stop.
Primary sources and scope
Consult the complete method, its limitations, and the scope of each standard. An educational calculator does not replace a task assessment.
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