Heat Index Calculator

Calculate the heat index (feels-like temperature) based on temperature and relative humidity.

21.0Kuses
8.5/10(410)
Heat Index (Feels Like)
100°F
38°C
Danger Level
Extreme Caution
Health Effects
Heat cramps and heat exhaustion possible

Features

  • NWS Rothfusz regression formula
  • Fahrenheit and Celsius support
  • Danger level with health effects
  • Adjustable humidity slider

Disclaimer: This tool is provided “as is” for informational and educational purposes only. Results may not be 100% accurate. ToolBird makes no warranties, express or implied, regarding the accuracy, reliability, or completeness of any output generated by this tool. This tool does not constitute professional, legal, financial, medical, or tax advice. Always consult a qualified professional for important decisions. By using this tool, you agree that ToolBird and its operators shall not be held liable for any damages, losses, or consequences arising from the use of this tool or reliance on its results. All processing occurs in your browser — we do not store, transmit, or access your data. Use at your own risk.