The usual figure for modern active dry yeast. Fermentis publishes ≥ 6 × 10⁹
viable cells/g as a minimum spec and Lallemand quotes ≥ 5 × 10⁹, but
measured counts on fresh sachets are typically nearer 10 × 10⁹. Pitching
calculators use 10, so we do too, to agree with them. The spread between 6
and 10 is real, which is why this is a parameter. yeast.ts's pitchPlan
uses the conservative 6 for "will one sachet do?", where underestimating is
the safe direction. Here the question is "how big a starter?", and a
pessimistic count wastes DME growing cells that were already there.
Cells per gram of dry yeast, in billions: 10.
The usual figure for modern active dry yeast. Fermentis publishes ≥ 6 × 10⁹ viable cells/g as a minimum spec and Lallemand quotes ≥ 5 × 10⁹, but measured counts on fresh sachets are typically nearer 10 × 10⁹. Pitching calculators use 10, so we do too, to agree with them. The spread between 6 and 10 is real, which is why this is a parameter.
yeast.ts'spitchPlanuses the conservative 6 for "will one sachet do?", where underestimating is the safe direction. Here the question is "how big a starter?", and a pessimistic count wastes DME growing cells that were already there.