Fermentation & Brewing Calculators
The fiddly yeast and gravity math, done right — no ads, no signup, no data leaving your browser. Each tool shows its formula and explains when the standard number is wrong, built by a former New Belgium yeast specialist.
The toolkit
Yeast Pitch Rate Calculator
Enter volume, gravity, and target cell density — get exact cells, liquid packs, grams of dry yeast, and starter growth. Ale & lager.
Yeast Starter Calculator
Size a starter to grow from a single pack up to your pitch-rate target — step volumes, DME, and expected cell yield.
Yeast Viability Calculator
Estimate a pack's real viable-cell count from its production date, so you stop pitching a "100 B" pack that's really 45 B.
ABV from Gravity
Convert original and final gravity into ABV and apparent attenuation with the standard and alternate formulas.
Attenuation Calculator
Apparent vs real attenuation against your target — the highest-signal check that a batch is tracking to style.
Priming Sugar Calculator
Dial in carbonation: grams of priming sugar by style, volume, and temperature for clean, safe bottle conditioning.
Hemocytometer Cell Count
Turn grid counts and dilution into cells/mL and total viable cells — the lab-grade way to trust a slurry.
Hydrometer Temp Correction
Correct a gravity reading for sample temperature so your OG/FG — and everything downstream — is actually right.
Yeast Propagation Scheduler
Plan a step-up propagation backward from brew day — each build's volume, cell target, and timing.
Want it tracked across every batch?
These tools answer one batch at a time. A done-for-you QC dashboard logs pitch, gravity, and attenuation across all of them — and flags a batch drifting out of spec before it's packaged.