I recently received a request for a sugar to Stevia conversion break down. Below I have listed the conversion. This is really good information for cooking. If you want to substitute sugar for a healthier substitute this is good to know.
Note: I use the white powdered extract form of Stevia.
1 teaspoon sugar = dust on spoon Stevia extract powder
1 tablespoon sugar = 1/2 pinch Stevia
1/4 cup sugar = pinch Stevia
1/2 cup sugar = 1/8 teaspoon Stevia
1 cup sugar = 1/4 teaspoon Stevia
Notice that it takes quite a bit less Stevia to equal the sweetness and flavor as sugar. One danger with Stevia is that if you use to much you can run the risk of making your food bitter. More is not better with Stevia.