30 F, 15 mph
- Celsius
- -7.2070528038 C
- Air temperature
- 30 F
- Wind speed
- 15 mph
The NWS formula is intended for cold temperatures with meaningful wind. Follow local weather alerts for frostbite risk.
Wind Chill Calculator
Enter cold-weather air temperature and wind speed to estimate wind chill in Fahrenheit and Celsius.
Inputs explainedResult checksExample valuesRuns in your browser
Formula steps
- Use the National Weather Service wind chill equation.
- Raise wind speed to the 0.16 power.
- Combine temperature and wind terms to estimate exposed-skin heat loss.
Examples
Recent answers
Recent wind chill calculations will appear here.
Weather math stays local. Follow local weather alerts for safety decisions.
Inputs and recent answers stay in this browser tab and are not sent to a server.
How to use the Wind Chill Calculator
- Enter air temperature in Fahrenheit and wind speed in miles per hour.
- Press Calculate wind chill to estimate the feels-like cold temperature.
- Use the formula mainly for cold, windy conditions.
- Follow local weather alerts for frostbite and outdoor safety decisions.
What people use it for
Estimate the feels-like cold before going outside.
Compare actual air temperature with wind chill temperature.
Convert the wind chill result to Celsius.
Check whether a temperature and wind speed are inside the NWS formula range.
Understand why wind chill is not the same as object temperature.
Quick examples
Cold windy day
30 F and 15 mphAbout 19.0 F wind chill
Freezing wind
20 F and 25 mphAbout 2.6 F wind chill
Very cold wind
5 F and 20 mphAbout -15.4 F wind chill
Formula range check
40 F and 10 mphAbout 33.6 F wind chill
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Wind Chill CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Everyday ToolsBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Wind Chill Calculator?
Use it when your task matches one of these common needs: Estimate the feels-like cold before going outside. Compare actual air temperature with wind chill temperature. It works best when you already know the measurements, amounts, units, or options the page asks for.
What is the Wind Chill Calculator doing with my inputs?
In plain language: The calculator uses the National Weather Service wind chill equation: 35.74 + 0.6215T - 35.75V^0.16 + 0.4275TV^0.16, where T is air temperature in Fahrenheit and V is wind speed in miles per hour. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.
What do the main Wind Chill Calculator inputs mean?
Temperature F: the air temperature in degrees Fahrenheit, intended for 50 F or colder. Wind speed mph: the wind speed in miles per hour, intended for speeds above 3 mph. Wind chill: a feels-like estimate for exposed skin in cold, windy weather.
How should I read the Wind Chill Calculator answer?
Read the headline answer, then check the smaller lines beside it. For everyday tools, those lines usually show the distance, time, cost, units, or setting that made the answer change.
What should I double-check before trusting the answer?
The NWS formula is intended for air temperatures of 50 F or colder and wind speeds above 3 mph. Wind chill estimates cold stress on exposed skin, not the actual temperature of objects. Follow local weather alerts for frostbite and outdoor safety decisions. Also check the unit, scale, mode, and result limit because small input changes can change the answer.
Why does the Wind Chill Calculator reject warm weather?
The NWS wind chill equation is designed for cold air and meaningful wind. Warm-weather comfort uses other ideas, like heat index and dew point.
Does wind chill change the real air temperature?
No. Wind chill is a feels-like estimate for exposed skin. A thermometer still reads the actual air temperature, and objects do not cool below the air temperature because of wind chill alone.
Can I use this result for frostbite timing?
Use local weather alerts and official safety guidance first. Wind chill can support a quick check, but clothing, wet skin, exposure time, health, shelter, and local conditions change real risk.
Why does a small wind speed fail validation?
The NWS wind chill equation is intended for wind speeds above 3 mph. At calm or very light wind, the feels-like effect is not in the formula range.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.