Wet Bulb Globe Temperature Calculator

The wet bulb globe temperature, or WBGT, is the heat stress index used by the military, athletic trainers and occupational safety agencies to set work and rest limits in the heat. Unlike the heat index, it accounts for sunlight and radiant heat as well as humidity, which is why it is the preferred standard for outdoor activity. This calculator gives a practical outdoor estimate by combining a wet bulb temperature derived from the air temperature and humidity, a globe temperature raised by a solar adjustment, and the dry air temperature using the standard outdoor weighting of seventy, twenty and ten percent. Enter the temperature, the relative humidity and the sun condition, choose your units, and read the estimated WBGT with its color coded flag zone. Because full WBGT needs specialized sensors, treat this as guidance rather than a certified reading. All computation runs locally in your browser for instant, private results.