Yeast Pitch Rate Calculator

Calculate the optimal number of yeast cells to pitch based on wort gravity, batch size, and beer style. Covers both ale and lager pitch rates.

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Proper yeast pitching rates are critical for clean fermentation. Under-pitching causes stressed yeast that produce excess esters, fusel alcohols, and off-flavors. Over-pitching can result in bland beer with poor yeast character. The standard rates are: ales need 0.75 million cells per milliliter per degree Plato, lagers need double that at 1.5 million. A standard liquid yeast pack contains roughly 100 billion cells when fresh, losing about 20% viability per month after production. Dry yeast contains approximately 20 billion cells per gram. For high-gravity beers (above 1.070), consider a yeast starter to grow enough cells.