Cold Weather Exercise Calculator

This calculator starts with the Environment Canada / National Weather Service wind chill formula — the standard equation used in official weather forecasts — which only applies when temperature is at or below 10°C and wind speed is at least 4.8 km/h; outside that range the "feels like" temperature just equals the actual air temperature. From there it estimates the metabolic cost of exercising in the cold: your body's baseline metabolic rate climbs roughly 1.5% for every degree below a 20°C thermoneutral point (capped at a 40% increase), on top of your normal exercise burn rate, which is itself scaled by body weight and the intensity level you select. That cold-driven surcharge is broken out separately as "extra calories from cold," isolating exactly how much of your total burn is temperature-driven versus workload-driven.

Clothing recommendations follow simple threshold rules rather than a brand-specific system: a mid layer doubles up below 0°C, an insulation layer is added below 0°C (and a second one below -10°C), and a wind shell gets added whenever wind exceeds 20 km/h or temperature drops below -5°C — each layer contributing an estimated weight so you can budget your pack. Frostbite risk is reported in minutes-to-injury on exposed skin, banded by wind chill thresholds (roughly -10, -28, -40, and -48°C) drawn from published frostbite-time tables; a result of 0 minutes simply means the wind chill hasn't crossed into meaningful risk territory. Fluid needs stay meaningfully high even in the cold — dry, cold air causes real respiratory water loss and sweat still accumulates under layers, so don't skip hydration just because you don't feel thirsty.