Which soy sauce do you need?
- Stir-frying or seasoning? → Chinese light soy (sheng chou) or Kikkoman all-purpose — ratio table below
- Adding color to a braise? → dark soy (lao chou) — 1 tsp per dish, no more
- Dipping sauce for dumplings? → light soy + rice vinegar + chili oil — dipping ratios section
- Gluten-free? → tamari — wheat-free, thick, ideal for dipping
- Japanese cooking specifically? → How to Use Shoyu — koikuchi, usukuchi, teriyaki ratios
- Need a substitute entirely? → Soy Sauce Substitutes
Seven types of soy sauce and when to use each
The most common mistake in Asian cooking is treating all soy sauce as one ingredient. A recipe calling for light soy sauce and receiving dark soy will be nearly black and under-seasoned. A recipe expecting kecap manis that gets Chinese light soy will be thin and too salty. The table below is the reference.
| Type | Color | Sodium (per tbsp) | Best for |
|---|---|---|---|
| Chinese light soy (生抽, sheng chou) | Amber | ~1,000mg | Stir-fry seasoning, marinades, dipping |
| Chinese dark soy (老抽, lao chou) | Very dark | ~800mg | Color (1 tsp per dish), braises |
| Japanese koikuchi shoyu | Amber-dark | ~900mg | Japanese cooking, general purpose |
| Japanese usukuchi | Light amber | ~1,000mg | Light dishes, egg custard, clear soups |
| Tamari | Dark brown | ~700mg | Gluten-free, thick dipping sauces |
| Sweet soy (kecap manis) | Almost black | ~400mg | Indonesian glazing, nasi goreng |
| White soy (shiro shoyu) | Pale yellow | ~900mg | Light-colored dishes, raw fish |
For a deeper comparison between tamari and soy sauce — including when tamari actually outperforms standard soy — see Tamari vs Soy Sauce. For the full entity overview of soy sauce as an ingredient, see What Is Soy Sauce.
Core ratios by cooking application
These ratios assume standard-sodium Chinese light soy or Kikkoman all-purpose. If using tamari, reduce by 15% (it is denser and slightly less salty). If using reduced-sodium soy, increase by 25–30%.
| Application | Soy sauce type | Amount | Key detail |
|---|---|---|---|
| Stir-fry (2 servings) | Light soy | 2–3 tbsp | Add in last 60 sec of cooking |
| Marinade (400g protein) | Any | 3–4 tbsp | With garlic, ginger, oil base |
| Dipping sauce | Light soy or tamari | 3 tbsp base | Dilute with 1 tbsp rice vinegar |
| Fried rice (2 servings) | Light soy | 2 tbsp | Add before egg, not at end |
| Glaze / reduction | Dark soy + honey | 1 tsp dark + 2 tbsp honey | Reduce by half over medium heat |
| Braise color | Dark soy | 1–2 tsp per 500ml liquid | For color only, not flavor |
How to build a stir-fry sauce with soy sauce
The simplest stir-fry sauce that works with any vegetable or protein combination follows a formula Chinese home cooks call a base sauce. It is not a recipe — it is a ratio.
- Light soy: 2 tablespoons — provides the primary salt and umami
- Oyster sauce: 2 tablespoons — adds body, sweetness, and glossy coating
- Sesame oil: 1 teaspoon — aroma only, added off heat
Mix these three before you start cooking. Stir-fry your aromatics (garlic, ginger, scallion whites) in a hot wok for 15 seconds, add your protein, cook until 80% done, add vegetables, toss for 60 seconds, then pour the sauce along the edge of the wok. The hot metal caramelizes the sugars in the oyster sauce and the amino acids in the soy simultaneously — this is where the savory depth comes from. Toss 30 seconds more and plate immediately. Add the sesame oil as the food leaves the wok.
For a spicier version, add 1 teaspoon of doubanjiang (fermented chili bean paste) to the aromatics before the protein. For a sweeter Cantonese profile, add 1 teaspoon of sugar to the sauce mixture.
How to build a universal soy sauce marinade
This marinade works for chicken thighs, tofu steaks, pork tenderloin, or hearty vegetables like eggplant and mushrooms. The ratio scales linearly.
- Soy sauce (any type): 3 tablespoons
- Rice vinegar: 2 tablespoons — acid tenderizes and brightens
- Sesame oil: 1 tablespoon — fat carries flavor into the protein
- Fresh ginger: 1 teaspoon grated — aromatic heat
Combine in a bowl or zip-lock bag. Marinate chicken or pork for 2–4 hours, tofu for 30–60 minutes (tofu absorbs quickly), and fish for no more than 30 minutes (the acid and salt break down delicate fish protein rapidly). Always pat the surface dry before cooking — residual marinade on the surface will steam rather than sear, preventing browning.
The reserve trick: set aside 2 tablespoons of the marinade mixture before adding raw protein. Use this reserved portion as a finishing drizzle or dipping sauce — it has not contacted raw meat and is safe to serve without cooking.
How dark soy transforms a braise visually
Dark soy sauce is the reason red-braised pork belly (hong shao rou) looks the way it does — deep mahogany with a lacquered sheen. Without dark soy, the same dish made with light soy and sugar produces a pale, anemic brown that reads as undercooked regardless of how long it braised.
The formula for visual transformation:
- Dark soy sauce: 1–2 teaspoons per 500ml braising liquid
- Shaoxing wine: 2 tablespoons — deglazes and adds depth
- Rock sugar: 15g (or 1 tablespoon regular sugar) — creates the gloss
The key insight: dark soy contributes color in teaspoon quantities. The flavor seasoning still comes from light soy sauce, added separately at 2–3 tablespoons. These two soy sauces work in tandem in Chinese braising — light for flavor, dark for appearance. Trying to achieve both with a single soy sauce always fails: too much light soy and the dish is pale; too much dark soy and the flavor is flat and cloying.
Soy sauce in fried rice: the timing rule
Add 2 tablespoons of light soy sauce per 2 servings of fried rice. The critical detail is when. Add the soy sauce to the wok before the egg goes in — pour it along the edge of the hot wok so it hits metal first, not cold rice. The soy caramelizes on the metal surface for 2–3 seconds before you toss the rice through it, coating grains in a thin layer of Maillard-browned soy rather than soggy liquid soy.
Adding soy sauce at the very end — as many Western recipes suggest — produces wet, unevenly colored rice with pools of liquid at the bottom of the plate. Adding it too early, before the rice has had time to dry and separate in the wok, creates a gummy, sodden mass. The 30-second window between the rice being fully separated and the egg being added is the correct moment.
For extra color in a darker fried rice (Indonesian or Malaysian style), add half a teaspoon of dark soy or kecap manis alongside the light soy. The kecap manis version adds a subtle sweetness that pairs well with sambal on the side.
Building dipping sauces from soy sauce
Every Asian dipping sauce is built on a soy sauce base with modifiers. The base ratio and what you add determines the cuisine:
- Chinese dumpling sauce: 2 tbsp light soy + 1 tbsp Chinese black vinegar (Chinkiang) + chili oil to taste + sliced garlic
- Japanese tempura dip (tentsuyu): 2 tbsp shoyu + 4 tbsp dashi + 1 tbsp mirin — serve warm
- Korean yangnyeom base: 2 tbsp soy + 1 tbsp gochugaru + 1 tsp sesame oil + 1 tsp sugar + sesame seeds
- Southeast Asian nuoc cham variation: 2 tbsp soy (replacing fish sauce for vegetarian) + 2 tbsp lime juice + 1 tbsp sugar + 1 sliced chili + garlic
For Japanese-specific dipping applications — sashimi, gyoza, noodle dips — the dedicated page is How to Use Shoyu, which covers koikuchi vs usukuchi selection for each application.
Shop Kikkoman Soy Sauce on Amazon →
Storage and shelf life
Refrigerate all soy sauce after opening. The volatile aroma compounds — pyrazines, furanones, and the fermented notes that distinguish good soy sauce from commodity versions — degrade through oxidation within 2–3 weeks at room temperature. Refrigerated, peak quality lasts about 1 month and usable quality extends to 6 months.
Bottle size guidance: if you cook Asian food 3+ times per week, the 1-liter bottle is the best value — you will finish it within the quality window. For occasional use, the 500ml or 300ml bottle prevents waste. Dark soy sauce, used in teaspoon quantities, lasts longer per bottle — the small bottle is usually sufficient.
Frequently asked questions
How much sodium is in a tablespoon of soy sauce?
It varies by type. Chinese light soy (sheng chou) contains roughly 1,000mg sodium per tablespoon. Japanese koikuchi shoyu is about 900mg. Tamari runs lower at around 700mg. Sweet soy sauce (kecap manis) is the lowest at approximately 400mg because sugar replaces a significant portion of the salt. Reduced-sodium versions of most types cut these numbers by 25–40%, though the flavor is noticeably thinner. If sodium is a concern, start with half the recommended amount and adjust upward.
How should I store soy sauce after opening?
Refrigerate after opening. Soy sauce oxidizes at room temperature — the color darkens, aroma flattens, and the complex fermented notes degrade within 2–3 weeks. Refrigerated, soy sauce maintains peak quality for about 1 month and remains usable for 6 months or longer. Dark soy sauce and kecap manis are more shelf-stable due to higher sugar content, but refrigeration still extends quality. Never pour unused soy sauce back into the bottle.
Why should I not use dark soy sauce as my only soy sauce?
Dark soy sauce (lao chou) is designed for color, not primary seasoning. It has a thick, molasses-like consistency and a muted, slightly sweet flavor compared to light soy. Using dark soy where light soy is called for will turn your dish an unappetizing near-black color while delivering less actual soy flavor per tablespoon. Think of dark soy as food coloring with a soy base — you need 1–2 teaspoons for color, not tablespoons for seasoning. Light soy handles the flavor; dark soy handles the visual.
Are reduced-sodium soy sauces worth buying?
For people managing sodium intake, yes — reduced-sodium soy sauces cut roughly 25–40% of the salt while preserving most of the umami. Kikkoman Less Sodium is the most widely available at about 575mg per tablespoon versus 920mg in the regular version. The trade-off is a thinner, less round flavor. A practical alternative: use full-strength soy sauce in smaller amounts and supplement with other umami sources — a pinch of MSG, a splash of dashi, or a teaspoon of mirin — to maintain depth without the full sodium load.
What is the difference between Kikkoman and Yamasa?
Both are naturally brewed Japanese koikuchi shoyu and both are reliable. Kikkoman is slightly sweeter and rounder, making it the more versatile all-purpose choice and the most recognized brand globally. Yamasa is slightly sharper and more forward with salt, which some cooks prefer for cooking applications where the soy flavor needs to cut through other ingredients. For dipping and finishing, Kikkoman's roundness is often preferred. For marinades and cooked dishes, the difference is subtle. Either is a quality choice over chemically hydrolyzed soy sauces.
What happens to soy sauce at very high heat?
The sugars and amino acids in soy sauce undergo the Maillard reaction rapidly above 150C (300F). At moderate-high heat, this produces desirable caramel-brown color and deep savory notes — the foundation of wok hei in stir-frying. At extreme heat or with prolonged contact, the sugars burn and produce bitter, acrid flavors. The solution: add soy sauce in the last 30–60 seconds of stir-frying, or pour it along the edge of the hot wok where it caramelizes instantly on the metal before contacting the food.
How long does soy sauce last after opening?
Unopened soy sauce keeps for 2–3 years at room temperature. After opening, the quality window depends on storage: refrigerated, peak quality lasts about 1 month and usable quality extends to 6 months. At room temperature, noticeable degradation begins within 2–3 weeks — the aroma goes flat and the color darkens beyond its original shade. Soy sauce does not become unsafe after these windows; it just loses the complexity that makes good soy sauce worth buying. If your soy sauce smells flat and one-dimensional, it is past its best for dipping but still fine for cooking.
Where to go next
- What Is Soy Sauce? — history, production, and the full soy sauce family tree
- How to Use Shoyu — Japanese shoyu applications: dipping, teriyaki glaze, ramen tare, finishing
- Usukuchi vs Koikuchi — light vs dark Japanese soy sauce: the counter-intuitive salt levels and when each applies
- Soy Sauce Substitutes — coconut aminos, liquid aminos, Maggi, and when each works
- Tamari vs Soy Sauce — when tamari outperforms standard soy sauce
- What Is Tamari? — the wheat-free, thick-bodied alternative
- Guides Hub — all ingredient and technique guides