Heat Stress Index Calculator

Calculate WBGT (Wet Bulb Globe Temperature) and determine ACGIH-recommended work/rest regimes based on workload intensity.

Natural wet bulb temp (°C)

Globe temperature (°C)

Dry bulb temperature (°C)

Outdoors with solar load?

Workload (1=Light, 2=Mod, 3=Heavy)

Acclimatised? (1=Yes, 0=No)

Tab to move between fields

WBGT (°C)

27.5

Work/rest regime1

Max work per hour (%)75%

Work minutes per hour45

Heat index (°C)36.2

Continuous work limit (°C)26.5

How to Use This Calculator

Enter Natural wet bulb temp (°C), Globe temperature (°C), and Dry bulb temperature (°C).
Set Outdoors with solar load?, Workload (1=Light, 2=Mod, 3=Heavy), and Acclimatised? (1=Yes, 0=No).
Review the WBGT (°C) result.
Use Work/rest regime and Max work per hour (%) to inform your decision.

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