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Wet Bulb Globe Temperature (WBGT) Heat Stress Calculator

WBGT heat stress index for outdoor exercise.

Estimates outdoor WBGT ≈ 0.7×Tw + 0.2×Tg + 0.1×Td, where Tw is wet-bulb temperature, Tg is black-globe temperature, and Td is dry-bulb temperature. Used to guide exercise restrictions.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

°C
°C
°C

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

WBGT = 0.7·Tw + 0.2·Tg + 0.1·Td

In depth

Estimates outdoor WBGT ≈ 0.7×Tw + 0.2×Tg + 0.1×Td, where Tw is wet-bulb temperature, Tg is black-globe temperature, and Td is dry-bulb temperature. Used to guide exercise restrictions.