Frequently Asked Questions

A typical carbonation level of 2.4 volumes for an average batch of 19 L (5 gal) whose beer reached 21 °C after fermentation needs about 133 g of corn sugar - roughly 4.7 oz - because the beer still holds about 0.8 volumes of residual CO2. The exact number depends on your batch size, target volumes and the warmest temperature the beer reached, which is why the priming sugar calculator asks for all three.

Yes, unless your hydrometer is temperature-compensating. Hydrometers are calibrated at 59-60 °F (15 °C); a sample at 100 °F reads about 6 points low (a 1.050 wort reads 1.044). The correction calculator adjusts any reading in Celsius or Fahrenheit.

Most home all-grain setups land between 65% and 75% brewhouse efficiency, with 70% a reasonable planning number. Fly sparging with good crush can push higher; BIAB with no sparge often runs a few points lower. Measure with the mash efficiency calculator once you know your grain bill and gravity.

It is a good approximation for typical beer gravities (within about 0.1% ABV). More refined formulas account for the non-linear relationship between gravity and alcohol; the ABV calculator offers the simple form, attenuation and ABW readouts.

Finish kombucha below pH 4.0 - the acidic zone where pathogens cannot grow - and most brewers target 2.5-3.5 for taste. The pH estimator models the acid curve from your starter share, temperature and days, and shows when your batch crosses the safe line.

About 12 g per liter of kombucha for standard carbonation - roughly one and a half teaspoons of sugar per 500 ml bottle - or 10-20% of the bottle as fruit juice. The 2F sugar calculator scales this to your bottle count and sweetness preference.

Typically 3-5 days at 24 °C (75 °F), ranging from 6-8 days in a cool 16 °C room down to 2-3 days at 30 °C. It depends almost entirely on temperature and sugar level; the 2F time calculator gives the window for your room.

Standard recipes use about 10-15% of batch volume - roughly 2 cups per gallon. More starter accelerates acidification and protects the batch; the kombucha batch calculator converts any batch size to tea, sugar and starter amounts.

Total hydration counts everything: starter flour and starter water included. A 1 kg-flour dough with 200 g of 100%-hydration starter has 1.1 kg total flour and about 800 g total water before adjustments - the hydration calculator does the split for any starter amount and hydration.

The classic bakery formula: water temp = DDT × 4 - flour temp - room temp - friction factor. For a 25 °C DDT with 20 °C flour, 21 °C room and no-knead friction (0), that is 59 °C - hot, but it cools as it mixes. The DDT calculator handles the arithmetic in °C or °F.

Around a 25 °C reference, bulk time doubles for every 5 °C colder: a 4-hour bulk becomes roughly 8 hours at 20 °C and 2 hours at 30 °C. The rising time estimator converts any recipe reference to your kitchen temperature.

Compute the flour weight that makes the whole dough (flour + water + salt + starter) land on the target dough weight. A 1:0.75:0.02 recipe with 20% starter needs about 457 g of flour for a 900 g dough. The bread weight calculator scales in either direction.

Most vegetables do well at 2-5% measured against the water (brine method) or the vegetable weight (dry-salt method): whole cucumbers 3.5-5%, quick ferments 2-3%, sauerkraut 2-2.5%, and warm-weather or long-storage batches 5-10%. The brine calculator shows both bases for comparison.

It depends on the recipe. The common convention measures against water only; some recipes use water plus vegetables, which produces a weaker brine at the same number. Always match the calculator basis to your recipe - the brine calculator reports both concentrations.

Yes, if you weigh it. Iodine is widely believed to slow fermentation or discolor vegetables (evidence is mixed), so non-iodized is conventional. Anti-caking agents are harmless in small amounts. Never trust spoon measures across brands - Diamond Crystal weighs about half as much per teaspoon as table salt.

Well-salted kimchi turns fresh-tangy in 1-2 days at 25 °C or 2-3 weeks in the fridge, and becomes fully sour in 3-6 days warm or 2-3 months cold. There is no too-sour for cooking (kimchi stew wants it); refrigerate whenever the taste is where you like it. The kimchi time calculator shows both windows.

About 30 g per liter is the classic rate - roughly two level tablespoons. Mild sets use 15 g and tangy ones up to 45 g; more starter does not make firmer yogurt, it just crowds the cultures. A freeze-dried direct-set packet covers up to 2 L of milk, so a 3 L batch takes two packets. The starter ratio calculator scales either route to your batch.

Thermophilic yogurt cultures peak around 43 °C (110 °F), and activity roughly doubles for every 5 °C toward that point. A 6-hour reference set turns into about 12 hours at 38 °C and about 4 hours at 46 °C. Cooler ferments run slower and milder; much above 46 °C the curd can turn grainy. Chill the jars as soon as the set firms up.

It is a weight ratio: grains grams = milk grams / ratio. A balanced 1:15 means roughly 33 g of grains - a bit over 5 tablespoons - in 500 ml of milk, fermenting in about 24 hours. Use 1:10 for a faster, tarter kefir (about 18 hours) or 1:20 for a milder one (about 30 hours). The milk kefir calculator shows the grains and the window for your amount.

Strain it cold through a cloth-lined sieve. Draining about 25% of the mass over 3-4 hours gives Greek-style, 35% over 6-8 hours gives thick Greek, and 50% over 10-12 hours gives labneh. Keep it in the refrigerator the whole time, and save the whey for bread, smoothies or lacto-fermentation brine. The straining calculator gives the yield and whey volume.

It follows the target ABV: OG = 1 + (ABV + residual) / 131.25. A 12% dry mead wants about 1.093, and each extra percent of ABV adds roughly 7.6 gravity points. A semi-sweet finish keeps a couple of percent of extract unfermented, so it starts higher than a dry one at the same strength. The mead must calculator turns your target and sweetness into honey and water.

Any sugar added to an unstabilized mead is fermentable, and roughly every 4 g per liter that ferments produces one volume of CO2. Lifting a 19 L batch from 0.998 to 1.010 adds about 595 g of sugar - enough for roughly 7.8 volumes if it all ferments, which is bottle-bomb territory. Stabilize with potassium sorbate plus metabisulfite first. The backsweetening calculator shows the CO2 risk.

Mead does, more than beer or wine: honey is very low in the nitrogen, vitamins and minerals yeast need, so an unsupplemented must ferments slowly and can throw sulfur off-aromas. A TOSNA-style plan splits an organic nutrient into four doses - at yeast pitch, at 24 hours, at 48 hours and at the one-third sugar break; for a must going 1.093 to 0.998, that break is around 1.061. Cider needs nutrients less often.

Apple sugar is almost entirely simple fermentable monosaccharides, with none of the unfermentable dextrins that stop beer, so a healthy ferment keeps going past 1.000 until the yeast runs out of sugar - readings down to about 0.992 are ordinary for a fully dry cider. The same (OG - FG) x 131.25 formula applies; the cider ABV calculator also reports attenuation and total alcohol.

About 1 g of spores per kilogram of rice is the safe home rate. The mold generates its own heat, so the core of the pile runs roughly 5 °C above the chamber and must stay below about 38 °C - break and turn the rice at the 6, 12, 20, 28 and 36-hour checkpoints to release heat. The koji incubation calculator lists the turns and flags a peak core that runs too warm.

Moromi runs 19-23 Baumé, which fits salt percentage on the line salt% = 1.11 x Baumé - 0.8, so roughly 20-25% salt by weight - several times a sauerkraut brine. That strength is deliberate: it holds spoilage microbes down across a 6-12 month ferment while the salt-tolerant koji enzymes break the beans into the amino acids behind soy sauce umami.

About 1.2 liters per kilogram of koji-and-bean mix, enough to cover the mash and carry the enzymes. So 2 kg of mix takes 2.4 L of brine, and at 19 Bé - roughly 20.3% salt - that is about 0.49 kg of salt to dissolve. Mix brine at the same strength for any top-up rather than adding plain water, which would dilute the protection.

Miso states salt as a percentage of the finished paste, and the paste includes the salt itself, so salt = (beans + koji) x salt% / (100 - salt%). White shiro uses around 100% koji and 6% salt; red aka about 60% koji and 10% salt. A fermented chili paste is simpler: 2-3% salt against the total mash weight, with garlic as a share of the batch. The miso and chili paste calculators size both.

Salt crystals differ hugely by brand, so a level spoon holds very different weights: about 18 g per tablespoon for table salt but only 8.4 g for Diamond Crystal kosher. The same recipe spoon can therefore double or halve your brine. Weigh salt in grams whenever you can, or use the salt weight calculator to get the spoon equivalent for the brand you actually have.

Use the doubling rule: activity roughly doubles for every 5 °C warmer and halves for every 5 °C cooler. A recipe that takes 3 days at 22 °C becomes about 1.5 days at 27 °C, and about 6 days at 17 °C. The sensitivity differs by ferment - sourdough near 5 °C, kimchi and kombucha nearer 6-8 - so the temp-time calculator lets you set the interval.

Through the ingredient density, because a spoon measures volume while grams measure weight. Water runs about 14.8 g per tablespoon, granulated sugar 12.5, all-purpose flour 7.8 and honey 21.3 - nearly a three-fold spread. Salt varies most by brand. The gram to tablespoon calculator converts both directions using real densities.

Start with the jar volume as a cylinder: pi x radius squared x height. Vegetables never pack solid, so a packing efficiency (65% is a safe default) splits that volume into vegetable space and the voids between the pieces. Brine fills the voids - roughly the total minus the packed volume - and salt is brine liters x salinity x 10. The jar capacity calculator works it out.