It all depends on the type of knife bevel and knife and tool sharpener that you have. The average angle that you want for a double bevel kitchen knife is about 20 degrees, though on a single bevel (Japanese knife) you’ll want between 17 and 15. Your automatic knife sharpener will most likely come with multiple channels to run the knife through, some of which are wider angles that help you shape the knife more effectively from a dull point.\r