Quick example
Replace one 7 g dry-yeast packet with fresh yeast
Red Star's chart pairs one 7 g dry-yeast package with two-thirds ounce of fresh cake yeast. Two-thirds ounce is approximately 18.9 g fresh yeast.
What changes
Weight equivalence does not replace package directions
Active dry
A dry yeast form that may have recipe-specific hydration or mixing instructions.
Instant
A dry yeast form often mixed directly with flour, depending on product directions.
Fresh cake
A moist, perishable yeast that requires more weight for the chart's equivalent.
Fermentation
Dough temperature, yeast age, sugar, salt, and time still affect activity.
Brand-specific guidance wins
Yeast conversions are practical approximations
Manufacturers and recipes do not all publish the same substitution factor. Use this result when Red Star's equivalency is appropriate; otherwise follow the package or recipe you are using. Changing yeast type may also require a different liquid temperature or mixing sequence.
Method & source
How the conversion is calculated
The reference comes from the Red Star Yeast conversion chart, which lists 7 g dry yeast and two-thirds ounce fresh cake yeast together and states that active dry or instant yeast may replace cake yeast. Ounce conversions use the NIST avoirdupois conversion factor.
Common questions
Yeast conversion FAQ
How much fresh yeast equals 7 g dry yeast?
About 18.9 g, or two-thirds ounce, using Red Star's chart.
Are active dry and instant equal here?
Yes, because the cited chart applies its dry quantity to either type. Follow different brand guidance when provided.
Will fermentation time stay the same?
Not necessarily. Product, temperature, dough composition, and yeast condition all matter.