how many oz in one packet of dry yeast?

Don't worry about the exact amount of yeast when making baked goods...a teaspoon of yeast (about 0.1 oz) is plenty to raise a couple loaves of bread, and any more than a packet (2 1/4 tsp or 0.25 oz) will just leave your baked good with a yeasty taste.

I believe the standard packet size is 0.25 ounces. Happy baking! :)