Turn air temperature and wind speed into a feels-like number — and a frostbite warning — using the official NWS / Environment Canada formula. Metric or imperial, browser-only.
- Runs locally
- Category Calculator
- Best for Getting a realistic range before a purchase, plan, workout, or schedule decision.
Wind makes it feel 8°C colder (Actual temperature: -5°C)
What this tool does
Wind doesn't change the thermometer, but it strips the thin layer of warm air your skin builds up, so a still 0 °C and a gusty 0 °C are nowhere near the same to your body. This calculator gives you the number that matters: the wind-chill (feels-like) temperature, using the exact 2001 formula the US National Weather Service and Environment Canada adopted. Type the air temperature and wind speed in either °C / km/h or °F / mph, and it returns the felt temperature plus how many degrees the wind has stolen. When you're outside the formula's valid range — above 10 °C, or wind under about 5 km/h — it says so instead of printing a meaningless number. Crucially it also grades frostbite risk: at roughly −27 °C felt, exposed skin can freeze in about 30 minutes; at −40 °C, in about 10; at −48 °C, in about 5. Every reading has a shareable link and a one-click copy, and the whole thing runs in your browser with no server, no logging, and no account.
Tool details
- Input
- Text + Numbers
- The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
- Output
- Live result + Copy + Preview
- The result area focuses on usable output, with copy, download, or preview actions when supported.
- Privacy
- Browser-side processing
- The main tool logic does not call an external API, so inputs normally stay in the current tab.
- Save / share
- Shareable URL state
- Key settings are encoded in the URL so another person can reopen the same setup.
- Performance budget
- Initial JS <= 10 KB
- No WASM budget is declared, keeping the tool quick to open on mobile.
- Best fit
- Calculator · Student
- Category and role tags drive related tools, internal links, and quick fit checks.
How to use
-
1. Input
Paste or drop your content into the tool panel.
-
2. Process
Click the button. All processing is local in your browser.
-
3. Copy / Download
Copy the result or download to disk in one click.
How Wind Chill Calculator fits into your work
Use it for fast estimates, comparisons, and planning numbers before you make the final call.
Calculation jobs
- Getting a realistic range before a purchase, plan, workout, or schedule decision.
- Comparing scenarios by changing one input at a time.
- Turning rough assumptions into a number you can discuss.
Calculation checks
- Double-check units, dates, rates, and rounding assumptions.
- Treat health, finance, tax, and legal outputs as planning aids, not professional advice.
- Save the inputs that produced an important result so you can reproduce it later.
Good next steps
These links move the current task into a more complete workflow.
- 1 Air Conditioner BTU Calculator Room area × ceiling × orientation × people → cooling BTU/h, 匹 (horsepower) and kW — sizes an AC right the first time — browser-only. Open
- 2 Unit Converter Convert between length, weight, temperature, area, volume, speed, time — instant, browser-only Open
- 3 Scientific Calculator Scientific calculator — sin / cos / log / sqrt / power, with full keyboard input + history, deg/rad mode. Open
Real-world use cases
Decide what to wear for a winter run
It's −3 °C and the wind app says 35 km/h. You enter both and the felt temperature comes back around −12 °C — cold enough that bare cheeks and fingers are the weak points. Knowing the feels-like number, not just the thermometer, is the difference between grabbing gloves and a buff or heading out and turning back five minutes in.
Plan a ski day safely
On the lift at −18 °C with a 40 km/h wind, the felt temperature is near −33 °C — squarely in the band where exposed skin can freeze in about half an hour. The frostbite warning tells you to cover the gap between goggles and balaclava before the next run instead of finding out the hard way at the top of the mountain.
Check a child's bus-stop wait
Before sending kids out, you punch in the morning's −7 °C and the 15 km/h gusts. The feels-like reads about −13 °C with a low frostbite risk — fine for a short wait in a proper coat and mittens, but the tool makes the call obvious instead of a guess.
Set a cold-weather work-site safety threshold
A site supervisor uses the calculator to translate the forecast into a felt temperature and frostbite band, then schedules warm-up breaks accordingly. When the feels-like crosses −27 °C, exposed-skin tasks get rotated on a 30-minute cycle to stay ahead of the frostbite window.
Compare two forecasts on the same scale
One day is −1 °C with a 45 km/h gale; another is −8 °C and dead calm. Plugged in, the windy day feels like about −9 °C while the calm day feels like −8 °C — almost identical to your body, which is the kind of apples-to-apples comparison the raw thermometer can't give you.
Common pitfalls
Treating wind chill as the air temperature for everything. Wind chill describes heat loss from bare skin; it does not affect a car radiator, a water pipe, or a thermometer — those only ever reach the actual air temperature, just faster in wind.
Using wind chill on a warm or near-calm day. The formula is only defined at or below 10 °C with wind above ~5 km/h. Apply it to a mild breeze and you'll get a number that has no physical meaning — for hot weather, use the heat index instead.
Mixing units. Entering a km/h wind speed while the tool is set to imperial (mph) inflates the wind term badly. Pick the unit system first, or use the toggle, which converts your typed numbers so the physical value stays the same.
Privacy
Every calculation — the wind-chill formula, the unit conversions, and the frostbite-risk lookup — is plain JavaScript that runs inside your browser tab. No temperature, wind speed, or location ever leaves the page, nothing is logged, and there is no external API call or account. The one thing to know: the shareable link encodes your inputs in the query string (e.g. ?temp=-5&wind=30&unit=metric), so if you paste that link somewhere, the destination server's access log will record those numbers. Weather readings are harmless to share, but that's the only place your inputs travel.
FAQ
Tool combos
Folks in your role tend to reach for these alongside this tool.
- Chinese Acupoint Locator 200+ meridian acupoints / WHO 2008 standard locations / with contraindications, manipulation, and combinations.
- Affine Cipher Encoder & Decoder Encrypt and decrypt the ax+b affine cipher with live modular-inverse check, browser-only
- Anagram Solver Check if two words are anagrams, rearrange a set of letters into every ordering, and read the sorted letter fingerprint, all in your browser
- Angle Converter Degrees, radians, gradians, turns, arcminutes, arcseconds and NATO mils, all from one input, copyable, browser-only