Engineering CalculationWBGT Heat Stress Calculator and Work-Rest Schedule
Find the Wet Bulb Globe Temperature for a work area and the work-rest cycle for the workload, for boiler houses, furnaces, foundries and outdoor sites.
Open the calculator →Formula
Outdoor (with sun): WBGT = 0.7 Tnwb + 0.2 Tg + 0.1 Tdb
Indoor / no sun: WBGT = 0.7 Tnwb + 0.3 Tg
Worked example
Outdoor: natural wet bulb 27 °C, globe 45 °C, dry bulb 35 °C
WBGT = 0.7×27 + 0.2×45 + 0.1×35 = 31.4 °C
Where engineers use it
- Heat stress surveys in boiler and furnace areas
- Summer work planning on construction sites
- Industrial hygiene records (survey report included)
How to use
- Click Open the calculator. It runs free in your browser, on desktop or phone.
- Enter your values. Units and typical ranges are shown next to each input.
- Read the result and the step-by-step working, then print or add it to your Project BOQ.
Questions
Is there a survey report format?
Yes, the EHS suite has a Heat Stress (WBGT) Survey report you can fill and print.