All tools Calculator

Yeast Pitching Rate Calculator™

The original pitching rate calculator, rebuilt by Lee McDole. How much yeast to pitch, viability by age, the right starter size, and slurry repitching — the same calculation engine that powers the Mr Malty apps for iPhone and Android.

Your batch

Batch volume (into the fermenter)

Original gravity

Fermentation type (sets pitch rate)

Your yeast

Yeast source

Number of vials / packs you have

Manufacture date (for viability; leave blank if fresh)

Advanced settings

Liquid viability decay model

Starter type (controls starter size for your technique)

Starter growth factor (packs needed; lower factor → more packs)

Yeast required

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billion healthy cells

Recommendation

Stepped Starter Calculator Chain multiple smaller starters to reach the target.

Mr Malty on your phone

The same calculation engine, built for iPhone and Android by Lee McDole (Tasty’s son). Free with a small ad at the bottom, or about $2 US to remove it. That money goes to Lee, to cover what it costs to keep the apps running.

Calculations run on the Mr Malty calculation API. This site uses Umami, a privacy-friendly analytics tool — no cookies, no cross-site tracking, no personal data collected.