Weather calculators
6 free tools
Quick tools for the weather questions that actually change your day — how hot it really feels in the humidity, how fast the wind will chill you, when dew and fog show up, and (just for fun) whether tomorrow might be a snow day. Every calculator works in both °F and °C.
Turn temperature and relative humidity into the dew point — the truest measure of how muggy the air actually feels.
Get the single 'real feel' temperature your weather app shows — it switches between wind chill and heat index depending on the conditions.
See how hot it really feels by combining the air temperature with relative humidity, using the National Weather Service formula.
Work out the relative humidity from the air temperature and the dew point, using the Magnus relationship in reverse.
A light-hearted guess at your odds of a snow day, based on forecast snowfall, temperature, and whether it's a school night — just for fun.
Find out how cold it really feels once you factor in the wind, using the National Weather Service wind chill formula.
Frequently asked questions
What does “feels like” temperature mean?
It's an estimate of how hot or cold the air feels to your body, not what a thermometer reads. In the heat it factors in humidity (the heat index); in the cold it factors in wind (wind chill). Weather apps usually show one combined number.
Which numbers do these use?
The heat index and wind chill tools use the official National Weather Service formulas, and dew point and humidity use the Magnus equation that meteorologists rely on. They match what you'd see on a forecast within a degree or two.
Can I enter Celsius instead of Fahrenheit?
Yes. Every weather calculator here has a °F / °C toggle, and it converts your inputs and results automatically, so use whichever unit you think in.