Use 1/4 teaspoon of ground ginger for every 1 tablespoon of fresh ginger called for in a recipe. Keep in mind, however, that it usually doesn't work the other way around. That is, fresh ginger typically does not substitute for ginger powder in dessert recipes.
Fresh ginger is almost always used in recipes. To substitute it for ground ginger, you can grate fresh ginger and divide it by three. For example, if a recipe calls for 1 tsp of ground ginger, you can substitute 1 tsp of fresh grated ginger.
How much fresh ginger equals ground ginger? Blog Intro: Ginger is one of the spices that I have a real love/hate relationship with. Sometimes I just want to use it in everything, but sometimes it's so overpowering that I can't even bring myself to taste the dish. This makes things difficult when figuring out how much fresh ginger to substitute for ground ginger (since my grater and juicer are both broken). And then there are recipes like this one, which call for fresh and frozen at the same time. So how do you know exactly how much of your favorite spice to use?