28°C · 45% RH · shade
≈22.2°C estimated WBGT
A comparatively lower modeled burden, though workload and duration still matter.
Estimated WBGT Calculator
Modeled estimate, not a sensor reading. This educational result uses air temperature and humidity with a simple sun adjustment. It is not suitable for official work-rest compliance decisions.
Result
29.5°C
Very highLimit strenuous activity and use conservative work-rest cycles.
Modeled, not measured
What this estimate can tell you
HeatGuard estimates natural wet-bulb temperature from air temperature and humidity, then combines 70% estimated wet bulb with 30% air temperature. The direct-sun option adds a simplified 1.8°C solar allowance.
Use the result to compare scenarios or choose a forecast window. It is not a measured WBGT because no black-globe sensor is present and the model cannot resolve the exact surface, shade, wind or clothing at a site.
Worked scenarios
Small input changes can cross a planning band.
32°C · 60% RH · direct sun
≈29.5°C estimated WBGT
Heat, moisture and the solar allowance move this estimate into a very-high planning band.
35°C · 70% RH · direct sun
≈33.5°C estimated WBGT
A modeled extreme signal that calls for the most conservative activity plan and protocol check.
Estimated WBGT planning reference
WBGT index chart: HeatGuard planning bands
These are HeatGuard's general planning bands for an estimated WBGT. They are not measured WBGT values or official work-rest limits and must not replace thresholds issued for a workplace, school, team or governing body.
Below 23°C
Low
Routine precautions
23–25.9°C
Moderate
Add breaks and monitor
26–27.9°C
High
Shorten hard efforts
28–29.9°C
Very high
Limit strenuous activity
30°C+
Extreme
Use the most conservative plan
Do not use this calculator for compliance.
Use the instrument, placement rules and thresholds required by the employer, league, school or governing body. Clothing and metabolic workload may require additional adjustments.