1/2 inch of ginger equals how many teaspoons

1/2 inch of ginger grated will produce about 2 teaspoons. If you're using powdered ginger, use just 1 teaspoon as in general use 1/2 part dry ingredients to substitute 1 part fresh.

Fresh ginger isn’t interchangeable with powdered ginger. It gives a different flavor. But what are you trying to make? More info is helpful.