Yeast Pitch Rate Calculator
Calculate the correct yeast pitch rate for healthy, clean fermentation. Enter your batch size, original gravity, and yeast type to see the required cell count in billions plus how many dry yeast packets, liquid yeast vials/pouches, or what size starter you need to hit the target.
Results
Why does yeast pitch rate matter?
Underpitching stresses yeast and produces excess esters, fusel alcohols, diacetyl, and sluggish or stuck fermentations. Overpitching reduces the desirable yeast-derived character and can produce thin, autolytic flavors.
The industry-standard target is around 0.75 million cells per mL per degree Plato for ales (Chris White / Jamil Zainasheff). Lagers are typically pitched at double the ale rate due to cooler fermentation temperatures. High-gravity beers (OG > 1.060) sit between the two.
A single fresh liquid vial (~100 B cells) is generally not enough for a 5-gallon batch above 1.040 OG — you'll need either multiple packs, a starter, or dry yeast. Starter sizes here use a simplified growth model assuming a stir plate (1.4× growth factor) and dense inoculation rates.
Pitch Rate Quick Reference (5 gal batch)
| OG | Ale (B cells) | Lager (B cells) |
|---|---|---|
| 1.040 | ~143 | ~286 |
| 1.050 | ~178 | ~356 |
| 1.060 | ~213 | ~426 |
| 1.070 | ~248 | ~496 |
| 1.080 | ~283 | ~566 |
| 1.090 | ~318 | ~636 |
| 1.100 | ~352 | ~704 |