How to Use the Windbreaker Windchill Effect Calculator
On a windy winter day, the same temperature can feel much warmer once you put on a windbreaker or heavy coat. Enter the temperature, wind speed, and the outerwear you're considering, and this tool compares the windchill with and without it, showing the exact improvement in degrees.
Windchill is calculated using the formula jointly adopted by Environment Canada and the U.S. National Weather Service: windchill = 13.12 + 0.6215×T − 11.37×V^0.16 + 0.3965×T×V^0.16 (T in °C, V in km/h). Outerwear is modeled as reducing the effective wind speed based on how well it blocks wind — a thin jacket cuts it by about 30%, a windbreaker by about 60%, and a heavy padded coat by about 80%. Actual felt warmth varies by fabric and individual differences, so treat this as a reference estimate.
Frequently Asked Questions
Windchill = 13.12 + 0.6215×T − 11.37×V^0.16 + 0.3965×T×V^0.16, in Celsius and km/h.
Outerwear reduces effective wind speed based on how well it blocks wind. A windbreaker cuts it to about 40%, a heavy coat to about 20%.
No, actual felt temperature varies with fabric, humidity, and individual differences — treat it as an approximation.