Mr. Malty's Pitch Rate Calculator
Free yeast pitch rate calculator based on Jamil Zainasheff's proven formulas.
Pitch rate is the single biggest factor in how your beer turns out — and most homebrewers are guessing. Mr. Malty's Pitch Rate Calculator takes the guesswork out of yeast pitching: enter your batch size, original gravity, and yeast details, and get an accurate cell count in seconds.
It works with any yeast — liquid (viability adjusted for package age), dry (calculates the packets you need), and repitched slurry (accounts for viability and concentration). The formulas come from Jamil Zainasheff, one of homebrewing's most respected voices, refined over years of real-world brewing. Free, with no account required.
The full user guide covers every input, output, and edge case. Common questions are answered inline.
Open the user guideGuide adapts to your app version — see the help page's version dropdown if you're on an older build.
Mr. Malty's Pitch Rate Calculator is built by McDole Group, LLC in collaboration with Jamil Zainasheff, the homebrewing author and educator behind the original pitch rate formulas. Jamil's work has guided a generation of homebrewers; this app makes it available anywhere you're brewing.