Heat Index Calculator

The heat index calculator is designed for scientists, meteorologists, and enthusiasts to understand how humidity affects the perceived temperature. Input the temperature and relative humidity to find out the apparent temperature.

Heat Index Calculator

Results

Heat Index: N/A

Source of Data and Methodology

All calculations are based on the formulas and data provided by the NOAA's National Weather Service. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

\[ HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2 \]

Glossary of Variables

How It Works: A Step-by-Step Example

To calculate the heat index, input the temperature and the relative humidity. For example, if the temperature is 90°F and the relative humidity is 85%, the heat index will tell you how hot it feels.

Frequently Asked Questions (FAQ)

What is the heat index?

The heat index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature.

Why is the heat index important?

It helps in understanding the potential risk of heat-related illnesses in extreme weather conditions.

Can the heat index be calculated in Celsius?

Yes, but conversions are necessary since the formula is based on Fahrenheit.

What is considered a dangerous heat index?

A heat index above 103°F is considered dangerous and can lead to heatstroke.

How accurate is the heat index?

The heat index provides a good approximation but may vary with individual tolerance and other environmental factors.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted LaTeX)
\[HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2\]
HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2
Formula (extracted text)
\[ HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2 \]
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
``` , ', svg: { fontCache: 'global' } };

Heat Index Calculator

The heat index calculator is designed for scientists, meteorologists, and enthusiasts to understand how humidity affects the perceived temperature. Input the temperature and relative humidity to find out the apparent temperature.

Heat Index Calculator

Results

Heat Index: N/A

Source of Data and Methodology

All calculations are based on the formulas and data provided by the NOAA's National Weather Service. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

\[ HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2 \]

Glossary of Variables

How It Works: A Step-by-Step Example

To calculate the heat index, input the temperature and the relative humidity. For example, if the temperature is 90°F and the relative humidity is 85%, the heat index will tell you how hot it feels.

Frequently Asked Questions (FAQ)

What is the heat index?

The heat index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature.

Why is the heat index important?

It helps in understanding the potential risk of heat-related illnesses in extreme weather conditions.

Can the heat index be calculated in Celsius?

Yes, but conversions are necessary since the formula is based on Fahrenheit.

What is considered a dangerous heat index?

A heat index above 103°F is considered dangerous and can lead to heatstroke.

How accurate is the heat index?

The heat index provides a good approximation but may vary with individual tolerance and other environmental factors.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted LaTeX)
\[HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2\]
HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2
Formula (extracted text)
\[ HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2 \]
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
``` ]], displayMath: [['\\[','\\]']] }, svg: { fontCache: 'global' } };, svg: { fontCache: 'global' } };

Heat Index Calculator

The heat index calculator is designed for scientists, meteorologists, and enthusiasts to understand how humidity affects the perceived temperature. Input the temperature and relative humidity to find out the apparent temperature.

Heat Index Calculator

Results

Heat Index: N/A

Source of Data and Methodology

All calculations are based on the formulas and data provided by the NOAA's National Weather Service. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

\[ HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2 \]

Glossary of Variables

How It Works: A Step-by-Step Example

To calculate the heat index, input the temperature and the relative humidity. For example, if the temperature is 90°F and the relative humidity is 85%, the heat index will tell you how hot it feels.

Frequently Asked Questions (FAQ)

What is the heat index?

The heat index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature.

Why is the heat index important?

It helps in understanding the potential risk of heat-related illnesses in extreme weather conditions.

Can the heat index be calculated in Celsius?

Yes, but conversions are necessary since the formula is based on Fahrenheit.

What is considered a dangerous heat index?

A heat index above 103°F is considered dangerous and can lead to heatstroke.

How accurate is the heat index?

The heat index provides a good approximation but may vary with individual tolerance and other environmental factors.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted LaTeX)
\[HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2\]
HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2
Formula (extracted text)
\[ HI = c_1 + c_2T + c_3H + c_4TH + c_5T^2 + c_6H^2 + c_7T^2H + c_8TH^2 + c_9T^2H^2 \]
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
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