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Heat Index Calculator — result sheet
Calculate the National Weather Service Rothfusz heat-index estimate from Fahrenheit temperature and humidity.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Apply the Rothfusz regression and its low- and high-humidity adjustments within the supported domain.
The calculator reports an apparent temperature, not a full sun, wind, acclimatization, or health-risk model.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Air temperature — F; minimum 80; maximum 150
- Relative humidity — %; minimum 40; maximum 100
Worked example
| Input | Value |
|---|---|
| Air temperature | 90 |
| Relative humidity | 50 |
The Rothfusz regression returns a heat-index estimate above the air temperature.
Assumptions and limits
- Fahrenheit temperature is at least 80 F and relative humidity is at least 40%.
- Shade-like conditions are assumed by the index.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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