Heat Index: NIOSH Calculator
Heat Safety & Risk Level Tool
About
This tool calculates the heat index based on temperature and humidity, providing OSHA-calibrated risk levels and protective recommendations for outdoor work. It also includes a reference guide for heat-related illnesses and first aid.
What's New in Heat Index
1.104.1
August 1, 2026
- ui improvements - bug fixes
Developer apps
FAQ
What is the Heat Index app?
The Heat Index app is a tool designed to calculate heat safety risks for outdoor workers. It uses temperature and humidity data to provide OSHA-calibrated risk levels and recommends protective measures.
How does the Heat Index app determine risk levels?
The app calculates the heat index based on temperature and humidity, then classifies the risk into levels like Lower, Moderate, High, Very High, and Extreme, following NIOSH and OSHA guidelines.
Does the Heat Index app offer first aid information?
Yes, the app includes a comprehensive reference guide for heat-related illnesses, detailing signs, symptoms, and first aid protocols for conditions such as heat stroke and heat exhaustion.
What industries is the Heat Index app useful for?
This app is particularly useful for industries with outdoor workforces, including construction, agriculture, landscaping, utilities, and any sector where workers are exposed to heat risk.
Is the Heat Index app free to use?
Yes, the Heat Index app is available for free, with no in-app purchases or advertisements, making it accessible for all users concerned with heat safety.
What devices support the Heat Index app?
The Heat Index app is designed for use on iPhones and iPads, ensuring accessibility for a wide range of Apple device users.
How often is the Heat Index app updated?
The app was last updated on August 1, 2026, with version 1.104.1, indicating ongoing support and potential for future improvements.
What is the age rating for the Heat Index app?
The Heat Index app has an age rating of 4+, making it suitable for users of all ages who need to understand heat safety information.