Yeast Calculators
Calculate pitch rates, starters, viability and fermentation parameters for healthy yeast.
Yeast Starter Calculator
Calculate starter size and steps to grow enough yeast cells.
Pitch Rate Calculator
Calculate optimal yeast pitch rate for ales and lagers.
Yeast Viability Calculator
Estimate yeast viability based on production date and storage.
Fermentation Temperature Calculator
Find optimal fermentation temperature ranges for different yeast strains.
Yeast Cell Count Calculator
Calculate total yeast cells needed from OG, volume and pitch rate.
Yeast Propagation Calculator
Plan multi-step propagation to build yeast from a small culture.
Yeast Harvest Calculator
Estimate yeast cell count from harvested slurry volume and density.
Krausen Calculator
Calculate krausen addition volume for natural carbonation.
8 free calculators in Yeast
Yeast Management for Better Homebrew
Yeast is the unsung hero of brewing — it converts sugar into alcohol and CO2, but it also produces the esters, phenols and subtle flavour compounds that define a beer's character. British ale yeasts are renowned for their fruity, complex profiles. Classic strains like Lallemand Nottingham (clean and reliable), Safale S-04 (malty with gentle fruit), and liquid cultures from White Labs and Wyeast offer a range of characters from crisp and neutral to richly estery. The pitch rate calculator helps you determine the right number of yeast cells for your batch — typically 0.75 million cells per millilitre per degree Plato for ales, with lagers needing roughly double that.
Underpitching is one of the most common homebrewing mistakes, leading to stressed yeast, off-flavours and incomplete fermentation. A single packet of dry yeast is often sufficient for a standard-gravity ale (up to about 1.050 OG), but for stronger beers you will need to pitch more. The yeast starter calculator sizes a starter on a magnetic stir plate to multiply your liquid yeast to the required cell count, stepping up in stages if needed. The yeast viability calculator is essential for older yeast packets — viability drops over time, and a sachet that has been sitting in the fridge for six months may have lost half its live cells.
Harvesting and repitching yeast from previous batches is a great way to save money and build a house yeast strain. The yeast harvest calculator estimates cell counts from harvested slurry, while the yeast propagation calculator plans multi-step propagation from a small culture or slant. For natural carbonation in kegs, the krausen calculator works out how much actively fermenting wort to add for carbonation without priming sugar — a traditional technique known as spunding or kräusening. The fermentation temperature calculator rounds out the toolkit by recommending ideal temperature ranges for different yeast strains, helping you plan whether you need active cooling, a heat belt or just a stable room in your house.