Kimchi Brine Salt Ratio (2–3% by Weight)

100%

Napa cabbage (baechu), halved or quartered — Core weight reference; weigh after trimming outer leaves but before salting

2–3%

Coarse sea salt or kosher salt (not iodized) — Iodized salt inhibits fermentation bacteria; use pure coarse sea salt or kosher salt. Korean kimchi salt (gulgeun sogeum) is preferred — coarser crystal that dissolves slowly

optional

Water (for brine or dry-rub method) — Either dissolve salt in water (wet brine) or rub salt directly between leaves (dry method); dry method is more traditional and concentrates flavor faster

WEIGHT-BASED: Weigh trimmed cabbage. Calculate 2% (mild, for faster fermentation) to 3% (more assertive, for longer aging). Cut cabbage into quarters lengthwise; sprinkle salt between every few layers of leaves with more concentrated at the thick white ribs, which are slower to wilt. Let rest 1–2 hours, turn cabbage, and rest another 1–2 hours (total 2–4 hours for 3 kg cabbage at room temperature). The cabbage is ready when the leaves bend without cracking and a white rib, when folded, does not snap. Rinse thoroughly under cold water 2–3 times to remove excess surface salt, then drain and gently squeeze.

• Always weigh cabbage — volume measurements are unreliable. Kitchen scale is non-negotiable for reproducible kimchi.
• Do not use iodized table salt: iodine is an antimicrobial that inhibits Lactobacillus and Leuconostoc bacteria essential for fermentation.
• The thick white ribs need more salt than the leafy green parts — concentrate extra salt there.
• Taste a rinsed piece before proceeding: it should taste pleasantly salty but not briny. Rinse again if too salty.
• Temperature affects wilting speed: 2–4 hours at 20–22°C (room temperature) vs. 8–12 hours refrigerated for the same result.
• After rinsing, squeeze out excess water firmly — excess moisture dilutes the paste and slows fermentation.

• Wet brine method

  Dissolve salt in cold water (2–3% salt solution) and submerge whole or halved cabbage for 6–12 hours; more even penetration but slower and requires more space

• Quick brine (3% + shorter rest)

  Higher salt concentration allows a 2-hour rest; rinse more thoroughly to prevent overly salty final product

• Young kimchi / geotjeori (no fermentation)

  Salt at 1.5% for a shorter wilt (1 hour), mix with paste and serve immediately without fermentation

• Radish kimchi (kkakdugi)

  Cubed mu (Korean radish) is salted at 2% and rested only 30–45 minutes — radish releases moisture faster than cabbage

• Lacto-Fermentation Brine (2–3.5% Salt by Weight of Water)

  The same salt range used in vegetable lacto-fermentation worldwide (sauerkraut, pickles); kimchi initial brine operates in the same window

• Gochugaru Paste Ratio for Kimchi

  The paste applied after salting; typically 2–5% gochugaru by weight of cabbage depending on heat preference

1. 1.The Art of Fermentation — Sandor Ellix Katz
2. 2.Maangchi's Big Book of Korean Cooking — Maangchi (Emily Kim)
3. 3.Kimchi: A Natural History of a Beloved Dish — Tasha Blaine and Kimchi Science Group references
4. 4.On Food and Cooking — Harold McGee

Confidence: high