General Rule: Pitch more yeast for higher gravity worts.
Dry yeast packets have a cell density of about 6 billion cells per gram. Most dry yeast packets are 11g, so about 66 billion cells per packet.
Recommended pitching rates/gal/gravity:
| GRAVITY | BILLION CELLS |
|---|---|
| less than 1.055 | 15 - 25 |
| 1.055 - 1.065 | 25 - 35 |
| 1.065 - 1.075 | 35 - 45 |
| 1.075 - 1.085 | 45 - 55 |
| 1.085 - 1.095 | 55 - 65 |
Recommended pitching rates/gravity/dry packet (11g):
| GRAVITY | PACKETS |
|---|---|
| less than 1.065 | 0.5 |
| 1.065 - 1.080 | 0.75 |
| 1.081 - 1.096 | 1.0 |
| 1.097 - more | 1.25 |