This is an application which uses PHS.js which is a JavaScript implementation of the Predicted Heat Strain (PHS) model described in the standard "ISO/FDIS 7933 Ergonomics of the thermal environment — Analytical determination and interpretation of heat stress using calculation of the predicted heat strain". PHS.js is based on "Predicted Heat Strain (PHS) model: computation program written in Quick Basic" in Annex E of the standard.

The following links are opened in a separate frame

• The PHS calculation and its development
• How to use the PHS.js library
• PHS.js code
• PHS.js code with code from annex E in ISO/FDIS 7933 as comments.
• PHS Calculation License