How do you convert time from a regular oven to a convection oven?

Reducing cooking temperature by 25 degrees F is one of the ways you can turn a conventional-oven recipe into a convection-oven recipe. The cooking time should be reduced by 25 percent. The temperature and time should be reduced by less than 25 percent.While each oven will be a little different, in essence, you are looking for three ways to convert a recipe from a conventional oven into a recipe from a convection oven Reduce the cooking temperature by 25oF (approximately 15oC). Reduce the cooking time by 25 percent. Reduce the temperature and time by less than 25 percent.