Calculate gust factor by comparing wind gust speed to sustained wind speed. This calculator shows gust factor, gust difference, gust increase percentage, wind speed conversions, and simple wind condition guidance.
Sustained wind:
Enter the steady or average wind speed reported by the forecast or weather station.
Wind gust:
Enter the stronger short burst of wind speed.
Gust factor:
The calculator divides gust speed by sustained wind speed.
Gust difference:
The calculator subtracts sustained wind speed from gust speed to show how much stronger the gust is.
A gust factor calculator is useful for weather tracking, storm planning, boating, aviation references, outdoor work, driving, camping, roofing, gardening, and understanding how variable the wind is.
Sustained wind gives the general wind speed, while gust speed shows short bursts that may create stronger impacts.
Your result shows how much stronger the wind gust is compared with the sustained wind. A higher gust factor means gusts are much stronger than the average wind, which can make conditions feel more sudden, unstable, or difficult to manage.
Gust factor is the ratio of gust speed to sustained wind speed.
Divide the wind gust speed by the sustained wind speed.
A gust factor of 1.5 means the gust speed is 1.5 times the sustained wind speed, or 50% higher.
Wind speed usually refers to sustained wind. Gust speed is a short burst of stronger wind.