Calculators
Every one runs the published equation and shows its working. The arithmetic happens in your browser, so nothing you type is sent anywhere.
Four of these answer "what is the number": heat index, wet bulb, WBGT and the printable chart. The other four
answer "so what do I do": work and rest minutes, a running pace, an acclimatisation schedule, and whether to
walk the dog.
Where a value is modelled rather than measured — every WBGT on this site, and every pavement temperature —
the page says so on the value itself rather than in a footnote.
What is the number?
- Heat index calculator Temperature and humidity in, heat index out — with the risk band named and the wet bulb and dew point alongside.
- Wet bulb calculator Wet bulb from temperature and humidity — or from a dew point — with the distance to the 35°C limit spelled out.
- WBGT calculator An estimated WBGT with the flag condition, and the natural wet bulb and black globe shown separately so you can see where the number comes from.
- Printable chart One page, both units, colours that survive a printer — for a noticeboard, a site hut or a classroom wall.
So what do I do?
- Work/rest calculator WBGT and workload in, minutes of work and rest per hour out — with the published table underneath and the next step-down named.
- Dog walk checker A yes-or-no answer from the heat index rather than the thermometer, plus an estimated pavement temperature for the surface you are actually walking on.
- Running pace calculator Target pace, temperature and humidity in, an adjusted pace out — built on dew point, which predicts a hard run better than temperature does.
- Acclimatization plan The NIOSH graded schedule as hours for your shift — new workers and returning workers on separate tracks.