Heat Index Calculator
Why does the weather app say it’s 90°F but it feels like you’re melting at 105°F? That’s the heat index talking—a sneaky little number that combines temperature and humidity to tell you how hot it really feels. With this Heat Index Calculator, you can stop guessing and start planning. Whether you’re prepping for a hike, a picnic, or just trying to survive a summer day, this tool gives you the real feel of the heat. No complicated math, no sweat—just enter the temperature and humidity, and voilà! You’ll know exactly how to dress, hydrate, and stay safe. Because let’s face it, life’s too short to be caught off guard by the weather.
Calculate how hot it feels based on temperature and humidity.
Heat Index: -
Enter values to calculate.
How It Works
The heat index is calculated using a formula that combines temperature (°F) and relative humidity (%). The formula accounts for how humidity makes the air feel hotter than it actually is. Here’s a simplified breakdown:
- If the temperature is below 80°F or humidity is below 40%, the heat index equals the temperature—it’s not hot enough to feel significantly worse.
- For higher temperatures and humidity levels, the formula uses a series of coefficients to adjust the "real feel" temperature. Think of it as a secret sauce that blends heat and moisture into a single, easy-to-understand number.
Below is a table showing how different combinations of temperature and humidity affect the heat index:
| Temperature (°F) | Humidity (%) | Heat Index (°F) |
|---|---|---|
| 85 | 50 | 87.8 |
| 90 | 60 | 94.7 |
| 95 | 70 | 104.3 |
| 100 | 80 | 118.1 |
| 105 | 90 | 134.5 |
10 Common Use Cases for the Heat Index Calculator
- Planning outdoor workouts to avoid overheating.
- Preparing for a summer hike or camping trip.
- Deciding what to wear on a hot, humid day.
- Assessing the risk of heat-related illnesses during outdoor events.
- Helping athletes understand safe training conditions.
- Gardening or landscaping in extreme heat.
- Planning a safe day at the beach or pool.
- Monitoring conditions for outdoor pets or livestock.
- Preparing for a road trip in hot weather.
- Educating kids about heat safety during summer break.