Today's equivalent of a cake of yeast I came across one of my mother's cookbooks from 1954.  A lot of the baked goods call for &quot;1 cake of yeast&quot;.  What would be the equivalent of this in today's supermarket?
You can find fresh cake yeast in grocery stores, but it's much less common than active dry yeast granulates.
1 cake of fresh yeast is approximately the same as 1 envelope/packet of active dry yeast. 1 packet usually equals about 2¼ teaspoons, or ¼ ounce, or 7 grams of active dry yeast granules.