The calculation, without hidden assumptions
Estimate apparent heat from air temperature and relative humidity using the standard regression. MAXScanner keeps the input assumptions and arithmetic visible instead of hiding the model behind a single answer. Use the defaults as a worked starting point, edit either value to compare scenarios, and read the calculation steps before relying on the result. This is a calculation workspace, not a substitute for measurements, professional design, weather warnings or domain-specific standards where those matter.
How to use this calculator
Enter air temperature (°c).
Enter relative humidity (%).
Read the result and visible calculation steps; change assumptions to compare scenarios.
Where people use it
- •Homework and quick checks
- •Engineering or science estimation
- •Scenario comparison with explicit inputs
Worked example
The defaults provide a ready-to-edit example. Change either input and the deterministic result updates from the same formula.
What the result does not assume
- •Heat index is an apparent-temperature estimate; direct sun, clothing, health and local conditions can change actual heat stress.
- •Treat the result as an estimate from the displayed inputs and model; verify safety-critical, regulated or design decisions with the applicable source data and qualified guidance.
Frequently asked questions
What does this heat index calculator calculate?+
Estimate apparent heat from air temperature and relative humidity using the standard regression.
Are the assumptions visible?+
Yes. Inputs, formula context and calculation steps remain visible so the result can be checked.
Can I use different values?+
Yes. The calculator is designed for editable scenario comparison.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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Keep the result connected to the real job
MAXScanner keeps the formula and assumptions beside the result so you can verify the number before using it in a drawing, estimate, specification, worksheet or document. Where a supplier, manufacturer, drawing or applicable standard owns a requirement, that source remains authoritative.