Our Better Homes and Gardens cookbook calls for "1 package active dry yeast" in its pizza recipe, which is less than helpful, since we keep a container of bulk yeast in the freezer. What is the standard volume (e.g. in teaspoons) of yeast in a package?
According to Red Star, a very common yeast brand in the US:
The strip contains three packets; each packet in the strip is considered one package. Each package contains 1/4 oz. or 2 1/4 teaspoons of yeast.
This is approximately 7 grams, or 11 ml.
This is representative of all of the US brands.
As far as measuring yeast, I use instant yeast, rather than packets. I have a Tupperware tub of year that's been in my freezer for about 15 years! It shouldn't be viable, but it is. The equivalent of 1 packet of yeast is 2 1/4 tsp. Since my yeast is so old, I use 1 1/2 tbsp (sometimes more) and I get wonderful bread out of my almost 25-year-old bread machine. I hope this helps.