Wind Chill Calculator Online
Work out the wind chill "feels like" temperature from air temperature and wind speed, calculated on your device.
The Wind Chill Calculator runs entirely in your browser. The air temperature and wind speed you enter never leave your device and are not uploaded to ArrayKit.
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About Wind Chill Calculator
Wind Chill Calculator turns air temperature and wind speed into the National Weather Service's "feels like" temperature, using the standard 2001 wind chill formula. Enter the air temperature and wind speed, switch between US units (°F, mph) and metric units (°C, km/h) with one toggle, and the feels-like reading updates instantly in both °F and °C. Because faster wind pulls heat away from skin more quickly, the calculator shows how the same air temperature can feel noticeably colder as wind speed climbs. It flags readings that fall outside the formula's documented range — air temperature at or below 50°F (10°C) with wind above 3 mph (5 km/h) — since the number is less meaningful outside those conditions. Useful for dressing for a hike, deciding whether outdoor work or sport is safe, or double-checking a forecast's feels-like figure. Everything computes locally in your browser; the figures you enter are never uploaded.
Features
- Computes wind chill using the National Weather Service (NWS) 2001 formula
- Shows the feels-like temperature in both °F and °C at once
- Toggle between US units (°F, mph) and metric units (°C, km/h)
- Updates instantly as you type — no submit button needed
- Flags readings outside the formula's validated temperature and wind range
- Copy the air temperature, wind speed, and feels-like result as a text summary
- Handles calm-wind and mild-temperature inputs without erroring
- Runs entirely in your browser with nothing uploaded
How to use the Wind Chill Calculator
- Choose US or metric units with the toggle
- Enter the air temperature
- Enter the wind speed
- Read the feels-like temperature in °F and °C, and check the range note if shown
Example
Input
0°F, 15 mph
Output
Feels like: -19°F
Using the NWS 2001 wind chill formula: 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16.
Common errors & troubleshooting
- Wind chill and air temperature look almost identical. — That's expected in calm or light wind — the wind chill formula only meaningfully lowers the feels-like temperature once wind speed is above about 3 mph (5 km/h).
- The Wind Chill Calculator shows a range warning banner. — The NWS formula is only validated for air temperature at or below 50°F (10°C) and wind above 3 mph. Above that temperature, wind chill isn't a meaningful cold-weather figure.
- Result seems off after switching units. — Re-enter the wind speed and temperature after toggling units — the fields show the value in the newly selected unit, so a leftover number from the other system will read incorrectly.
- Wind speed was entered as a negative number. — Wind speed can't be negative; enter 0 for calm air or a positive speed reading.
Frequently asked questions
- What does the Wind Chill Calculator actually compute?
- It applies the National Weather Service's 2001 wind chill formula to your air temperature and wind speed to estimate how cold the air actually feels on exposed skin, shown in both °F and °C.
- Why does wind chill make the temperature feel lower than the thermometer?
- Moving air removes body heat faster than still air. The Wind Chill Calculator's formula factors in wind speed to the power of 0.16, so faster wind pulls the feels-like number down even though the actual air temperature hasn't changed.
- What is the valid range for the wind chill formula?
- The NWS formula used by this calculator is documented as accurate for air temperature at or below 50°F (10°C) and wind speed above 3 mph (5 km/h). The calculator still computes a value outside that range but shows a warning.
- Can I switch between Fahrenheit/mph and Celsius/km/h?
- Yes. The Wind Chill Calculator has a unit toggle for US units (°F, mph) and metric units (°C, km/h); the feels-like result is always shown in both °F and °C regardless of which units you enter.
- Is wind chill the same as heat index?
- No — wind chill estimates how cold it feels in cold, windy weather, while the Heat Index Calculator estimates how hot it feels in warm, humid weather. They use different formulas for opposite conditions.
- Does the Wind Chill Calculator upload my location or weather data?
- No. The Wind Chill Calculator runs entirely in your browser. The temperature and wind speed you type never leave your device and are not uploaded to ArrayKit.
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