Fermentation Calculators
Free fermentation calculators for kombucha, kimchi, sauerkraut, and other fermented foods.
Tools for home fermenters and food preservers.
Lacto-Fermentation Salt Calculator
Calculate how much salt to add for any lacto-fermentation project. Choose your target percentage by ferment type and enter vegetable weight.
Beet Kvass Fermentation Calculator
Calculate beet kvass fermentation recipe from beet weight, salt percentage, and water temperature. Returns brine ratio, ferment time, and expected batch yield.
Drinking Vinegar Shrub Syrup Calculator
Calculate fruit, sugar, and vinegar ratios for drinking shrubs using cold or hot-process methods. Scale from 1 cup to gallon batches with vinegar options.
Tepache (Pineapple Beer) Calculator
Calculate pineapple, piloncillo and spice amounts for homemade tepache by batch volume, with an alcohol estimate at 24, 48 and 72 hours of fermenting.
Fermented Hot Sauce Calculator
Calculate salt weight, mash breakdown, ferment time and bottle yield for lacto-fermented hot sauce, plus a Scoville estimate for the finished sauce.
Ginger Beer Fermentation Calculator
Calculate sugar, ginger, and yeast amounts for homemade ginger beer. Returns fermentation time, carbonation pressure estimate, and batch yield in bottles.
Homemade Vinegar Acidity Calculator
Calculate homemade vinegar acidity from starting ABV and progress. Returns estimated acetic acid percentage and whether it meets the 5% USDA canning standard.
Jun Tea (Green Tea Kombucha) Calculator
Calculate honey, green tea, and water ratios for brewing Jun tea by batch volume. Includes fermentation timelines and SCOBY starter ratio.
Miso Fermentation Calculator
Calculate soybean, koji, and salt ratios for homemade miso by style and batch size. Covers white, yellow, and red miso with fermentation timelines.
Sourdough Starter Feeding Calculator
Calculate sourdough starter feeding ratios and build any amount for a recipe. Returns seed, flour and water in grams with a temperature-adjusted peak time.
Tempeh Fermentation Calculator
Calculate soybean quantity, Rhizopus starter, vinegar and incubation time for homemade tempeh, with a batch yield and a warning at fatal temperatures.
Water Kefir Batch Calculator
Calculate sugar, minerals, and water for water kefir from grain quantity and batch size. Returns first and second fermentation ratios with time guidelines.
Kimchi Salt and Ingredient Calculator
Calculate the right amount of salt, gochugaru, and other ingredients for any batch size of traditional kimchi. Scales from small jars to large batches.
Kombucha Batch Calculator
Calculate tea, sugar, and starter liquid amounts for any kombucha batch size. Includes first and second fermentation ratios.
Sauerkraut Salt Ratio Calculator
Calculate the exact amount of salt needed for any batch of sauerkraut. Uses the 2% salt-to-cabbage ratio for safe, reliable lacto-fermentation.