Winter hub
The Cold Countdown
Enter the temperature and wind, tell it how wet and how active you'll be — and get an estimate of how long your body has before frostbite and hypothermia set in.
Conditions
Clothing state
Activity
Wind chill
6°F
How fast your body loses heat to moving air.
Frostbite (exposed skin)
30+ min — low risk
Nose, cheeks, ears, fingers first. Cover skin to reset this clock.
Time to hypothermia
≈ 7 h 17 min
Rough field estimate to mild hypothermia with typical winter layers.
This is an estimate, not a shield
These figures use standard wind-chill science and field rules of thumb. Real timelines vary with fitness, fat, food, layering, and luck — treat every number as the optimistic end, and act the moment anyone starts shivering, fumbling, or mumbling. Wet clothing is the single biggest accelerator: change into dry layers before you need this calculator.