Yeast Starter Calculator
Find out whether the yeast you have on hand meets your target pitch rate, and if not, how big a starter (or step-up plan) to build. A homebrewing reference, not an official measurement — see the disclaimer below.
Calculator
Non-regulatory estimateEnter your batch volume, OG, and what yeast you have on hand to see whether you need a starter — and if so, how big.
⚠️ This is a reference estimate for homebrewing — not an official measurement, and never valid for a tax or label filing.
The wort's starting gravity (e.g. 1.050).
Ale 0.75 / lager 1.5 — editable.
Check your product — commonly 100–200 billion.
Enter your batch volume, OG, and yeast on hand to see whether you need a starter.
Estimate only — pitch rates and liquid-pack viability follow the standard White & Zainasheff (Yeast) conventions; starter growth follows the Braukaiser/ White–Zainasheff growth studies, reproduced here as simplified reference figures per litre by aeration method. Not a laboratory cell count for your specific yeast, and never valid for a tax or label filing.
Reference tools, not a system of record. These free calculators are provided for convenience and general reference only. They are not a system of record and must not be used as the basis for any TTB or state compliance filing — even when a result is correct. Your official filings are governed by the applicable measurement and gauging methods and by your own production records.