What pitch rate should I use?

Ales: 0.75 million cells/ml/degrees Plato. Lagers: 1.5. Higher pitch rates produce cleaner fermentation.

How many cells in a yeast packet?

Fresh liquid yeast: ~100 billion. Dry yeast (11g): ~200 billion. Cell count decreases with age.

What happens with under-pitching?

Longer lag times, higher esters and fusel alcohols, potential stuck fermentation, and off-flavours.

What happens if I over-pitch?

Moderate over-pitching (up to 2x the recommended rate) is generally fine and can produce cleaner fermentation. Extreme over-pitching can lead to reduced ester production, thinner beer, and potential autolysis off-flavours. For most homebrewers, slight over-pitching is safer than under-pitching.

Do I need a different pitch rate for high-gravity beers?

Yes, high-gravity beers (above 1.070) need more yeast cells. Use the same pitch rate formula but note that more cells are needed due to the higher Plato value. Consider a yeast starter or pitching multiple packets. Proper oxygenation is also critical for high-gravity fermentations.

BrewCalcs

Pitch Rate Calculator

Calculate optimal yeast pitch rate for ales and lagers.

Original Gravity

Gravity of the wort before pitching yeast

Batch Size

Volume of wort to be fermented

Beer Type

Type determines the recommended pitch rate

How We Calculate This

Pitch Rate Formula

Cells = Rate x Volume (ml) x Plato. Standard: Ales 0.75, Lagers 1.5 million cells/ml/degree Plato.

Frequently Asked Questions

Related Calculators

Yeast Starter Calculator

Calculate starter size and steps to grow enough yeast cells.

Yeast Viability Calculator

Estimate yeast viability based on production date and storage.

Fermentation Temperature Calculator

Find optimal fermentation temperature ranges for different yeast strains.

Yeast Cell Count Calculator

Calculate total yeast cells needed from OG, volume and pitch rate.

Yeast Propagation Calculator

Plan multi-step propagation to build yeast from a small culture.

Last updated: 2025-02-20

All calculations are estimates. Always verify values and adjust based on your equipment and ingredients.