Brine for Smoking Fish: Seafood Brine Calculator (Salmon, Trout, Shrimp)
2 lb salmon, 6% smoking brine: 114 g Diamond Crystal (about 13 1/2 tbsp) and 114 g sugar in 2 qt water, 5.5 hours in the fridge, then smoke to 145°F and hold it 30 minutes.
Enter the fish, its weight and thickness, and get the salt, water, and time for a cooking, smoking, or gravlax brine.
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- Spoons for your salt brand
Your brine
Cooking: 3.5 to 6%, 15 to 60 minutes. Smoking: 5 to 8%, hours by thickness. Gravlax: salt and sugar on the fish, no water.
The group sets the cooking-brine time; the name only labels the result.
Fillets, steaks, or shelled pieces. 0.1 to 20 lb (0.05 to 9 kg).
Sets the time. 0.25 to 6 in (0.5 to 15 cm).
Smoking brines run 5 to 8%. Stronger means fewer hours: 8 hours per inch at 5%, about 3 at 8%.
Filled in as twice the fish's weight (2 cups minimum); change it to what your container needs.
Brown or white sugar by weight. Equal parts is the usual smoked-fish brine; half is enough for a cooking brine.
Weigh the salt if you can; the spoons are a check. No curing salt: nitrite in smoked fish is a regulated commercial process, and the only page here that doses it is the bacon curing calculator.
2 lb salmon, 6% smoking brine
about 13 1/2 tbsp
- Sugar
- 114 g
- Water
- 2 qt (1.89 L)
- Strength
- 6% salt to water by weight
- Time
- 5.5 hours at 1 in thick
Common batches
2 lb salmon fillet, smoking brine
114 g Diamond Crystal (about 13 1/2 tbsp)
114 g sugar, 2 qt water, 6%
5.5 hours at 1 in thick
1 lb shrimp, cooking brine
47.3 g Diamond Crystal (about 5 1/2 tbsp)
23.7 g sugar, 1 qt water, 5%
15 minutes at 0.75 in thick
1 lb whole trout, smoking brine
56.8 g Diamond Crystal (about 7 tbsp)
56.8 g sugar, 1 qt water, 6%
8.5 hours at 1.5 in thick
1.5 lb cod, cooking brine
71 g Diamond Crystal (about 8 1/2 tbsp)
35.5 g sugar, 1.5 qt water, 5%
30 minutes at 1 in thick
1 kg salmon side, gravlax cure
35 g Diamond Crystal (about 4 tbsp)
35 g sugar, no water, 3.5% of the fish
36 hours at 2.5 cm thick
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Browse brining supplies on AmazonHow this is calculated
This seafood brine calculator is a salt percentage, a water weight, and a number of hours set by thickness. Enter the fish, its weight and thickness, and the calculator returns the salt in grams (and spoons for your salt), the sugar, the water, and the time, for a cooking brine (3.5 to 6%, 15 to 60 minutes), a smoking brine (5 to 8%, hours), or a gravlax cure. How long to brine salmon before smoking, why the smoking brine runs longer, and the FDA temperatures for hot-smoked fish are all below the calculator.
Salt is a percentage of the water's weight (the culinary convention on this site), computed in grams and only then turned into spoons for the salt you picked. Time comes from the thickness and the strength, not from the weight.
water (g) = 2 x fish (g), at least 473 g (2 cups),
rounded up to 1/4 qt; editable
salt NaCl (g) = water (g) x percent
salt to weigh = NaCl (g) / purity
(Redmond 0.96, Celtic grey 0.81, others 1.00)
sugar (g) = salt (g) x 0, 0.5, or 1
cook (min) = base (group) x thickness (in) x 5 / percent,
held between 15 and 60
smoke (h) = 8 x (5 / percent)^2 x thickness (in),
held between 1 and 12
gravlax = fish (g) x 3.5% salt + equal sugar;
36 h x thickness (in), held between 24 and 72
thickness factor is held between 0.5 and 2
(a 1/4 in shrimp is not brined for 4 minutes)
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Cooking-brine base times
Minutes for a 1 inch piece in a 5% brine, scaled by thickness and inversely by strength, then held between 15 and 60 minutes. These are house figures set from the Pacific Northwest Extension bulletin's short brines (about 30 minutes for a gutted herring, 2 hours for large chunks of a 30 lb salmon in a much stronger brine) and from the way brine time in the usual published fish recipes tracks density.
| Group | Base, 1 in at 5% | Typical result |
|---|---|---|
| Shellfish | 15 min | 15 to 30 min |
| Thin white fish | 20 min | 15 to 30 min |
| Medium fish | 30 min | 30 to 60 min |
| Firm and oily fish | 40 min | 30 to 60 min |
| Steak fish | 45 min | 30 to 60 min |
Why the smoking brine is measured in hours
The FDA's target for smoked fish sold in reduced-oxygen packaging is at least 3.5% water phase salt in the loin muscle (Fish and Fishery Products Hazards and Controls Guidance, quoted in Oregon State's smoked fish compendium). Getting that much salt into the flesh takes hours in a 5 to 8% brine. Salt uptake runs roughly with the concentration times the square root of the time, so the calculator scales hours with the inverse square of the percentage: the PNW Extension's 1 hour in a brine of 1 part table salt to 7 parts water by volume (about 15% salt by weight of the brine, or 60 degrees on the salometer scale) works out to roughly 8 to 9 hours at 5%; the calculator uses 8, then 5.5 at 6% and 3 at 8%, per inch of thickness. The 12 hour ceiling is the page's safety line. Home smokers cannot measure water phase salt, which is why the time, the 145°F hold, and the 38°F storage rule below all matter.
Spoon estimates
| Salt | Per tbsp | Per cup | Source |
|---|---|---|---|
| Diamond Crystal kosher | 8.4 g | 134 g | Diamond Crystal label (1/4 tsp = 0.7 g) |
| Morton kosher | 14.4 g | 230 g | Morton label (1/4 tsp = 1.2 g) |
| Table, pickling, fine sea salt | 18 g | 288 g | USDA, 6 g per tsp |
| Redmond Real Salt | 16.8 g | 269 g | Redmond label (1/4 tsp = 1.4 g, about 96% salt) |
| Celtic light grey | 18 g | 288 g | Selina Naturally label (1/4 tsp = 1.5 g, about 81% salt; the calculator weighs it up) |
| Himalayan pink, fine / coarse | 16.5 / 15 g | 264 / 240 g | Measured (Is Salt); approximate |
| Flake salt (Maldon) | 8.3 g | 133 g | Measured (DadCooksDinner); approximate |
Smoking fish safely
- After the brineRinse, dry, rest. Rinse briefly, pat dry, and leave the fish uncovered on a rack in the refrigerator for 1 to 3 hours until the surface is tacky. That is the pellicle, and smoke sticks to it.
- Hot smoke145°F for 30 minutes. The FDA guidance requires hot-smoked fish to reach 62.8°C (145°F) throughout and hold it for at least 30 minutes. The PNW Extension bulletin for home smokers says 160°F for at least 30 minutes, to allow for a thermometer that is not in the thickest spot. Smoke at 200 to 225°F and check with a probe.
- Cold smokeSmoker at or below 90°F (32.2°C). Cold-smoked fish is never cooked, so its safety rests on the salt content and the storage temperature, neither of which a home kitchen can verify. The Extension bulletin for home smokers covers only hot-smoked fish and calls cold-smoked fish a different product.
- Storage38°F (3.3°C) or below. Refrigerate smoked fish below 38°F and eat it within one to two weeks, or freeze it (PNW Extension; the AFDO and NMFS smoked-fish guidelines quoted in Oregon State's compendium set the same 38°F, while the FDA's own commercial line is 40°F). Vacuum-packed smoked fish is not shelf stable; keep it cold.
While brining
- Brine at 32 to 40°F (0 to 4°C), in the refrigerator, never on the counter. Oregon State's guidance puts brines longer than 4 hours at 38°F or below.
- Never brine seafood more than 24 hours; 12 hours is the most this calculator will give, and most fish needs far less.
- Use a non-reactive container: glass, stainless, or food-grade plastic. Discard the brine after one use.
- Cook fish to 145°F (63°C) at the thickest point; cook shellfish until opaque (foodsafety.gov).
Gravlax cure
A house range, since no extension bulletin publishes a gravlax ratio: salt at 3 to 4% of the fillet's weight, an equal weight of sugar, and as much dill as you like. Pack the cure over the flesh side, wrap tightly, weight it down in a dish, and refrigerate 24 to 72 hours (the calculator gives 36 hours per inch of thickness), flipping every 12 hours. Scrape off the cure, slice thin, and keep it at 40°F or below. Gravlax is never cooked, so use fish that has been frozen for parasite control: the FDA Food Code figure is -4°F (-20°C) for 7 days, which is what "sushi grade" or "previously frozen" fish from a good fishmonger has had.
What you'll need
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- Kitchen scale that reads in grams. A 6% brine in 2 quarts is 114 g of salt; a cup of Diamond Crystal and a cup of Morton are 100 g apart.
- Instant-read or leave-in probe thermometer for the 145°F hold in the smoker and the 145°F finish on the grill.
- Wire rack and sheet pan for the pellicle rest in the fridge.
- Non-reactive container or zip bag that holds the fish under 2 quarts of brine and still fits in the fridge.
How this page is checked
This calculator was built by Cedrick Reese for BrineCalculators.com. Three of the smoking rules on this page (145°F held for 30 minutes, 3.5% water phase salt, and a cold-smoke ceiling of 90°F) are taken from the FDA Fish and Fishery Products Hazards and Controls Guidance as quoted in Oregon State University's smoked fish compendium. The fourth, storage at 38°F or below, is the AFDO and NMFS smoked-fish guideline quoted in the same compendium and the figure in the Pacific Northwest Extension bulletin for home smokers; the FDA's own storage line for commercial smoked fish is 40°F, so 38°F is the stricter of the two. The home-smoker cooking rule (160°F for 30 minutes) is from the same Pacific Northwest Extension bulletin, linked below. The brine percentages and the cooking times are house ranges checked against those two bulletins and against the ratios in published smoked-fish recipes (20 parts water to 1 part salt, a quarter cup of kosher salt to 4 cups of water). Salt weights come from the makers' nutrition labels and America's Test Kitchen, through the salt table every calculator on this site shares.
Every figure the script uses is printed in the method section above it, so a reader can check the arithmetic by hand. When the FDA guidance or a salt label changes, the constant changes in one place and the page recalculates. If a number here disagrees with the FDA or Oregon State text, that is a bug; use the contact page to report it.
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Frequently asked questions
How long should I brine fish before smoking?
Hours, not minutes, and the percentage sets the hours. For a 1 inch thick fillet, a 5% brine (salt to water by weight) takes about 8 hours, 6% about 5.5 hours, and 8% about 3 hours; thinner pieces take less and the calculator scales by thickness. Stop at 12 hours whatever the strength. The reason smoking brines run so long is the FDA target of at least 3.5% water phase salt in the finished smoked fish (Fish and Fishery Products Hazards and Controls Guidance, quoted by Oregon State's seafood compendium). After the brine, rinse, pat dry, and rest the fish uncovered on a rack in the fridge for 1 to 3 hours to form the pellicle, the tacky surface smoke sticks to.
Why is my brined fish too salty?
Too much salt for the water, too long in the brine, or no rinse afterward. Salt is a percentage of the water's weight, so a 5% brine is 47 g of salt per quart (946 g) of water, whatever brand of salt you use; measured by the cup, Morton kosher and table salt pack 1.7 to 2.1 times the salt of Diamond Crystal, which is the usual way a brine goes wrong. Weigh the salt, keep to the minutes the calculator gives, and rinse anything brined at 6% or above. If a batch is already too salty, soak it in cold fresh water for 20 to 30 minutes and pat dry.
Can I brine frozen fish or should I thaw it first?
Thaw it first. Frozen fish takes up brine unevenly, and the water it sheds while thawing dilutes the brine to an unknown percentage. Thaw in the refrigerator overnight, pat dry, then brine. Never thaw on the counter; foodsafety.gov's rule is that food should not sit between 40 and 140°F (4 to 60°C) for more than 2 hours.
Do I need to rinse fish after brining?
For a 3.5 to 5% cooking brine, a rinse is optional but patting dry is not: a wet surface steams instead of browning. For 6% and above, and for every smoking brine, rinse briefly under cold water to take off the surface salt, then pat dry. Fish for the smoker then needs 1 to 3 hours uncovered on a rack in the fridge so the pellicle forms.
What's the difference between wet brine and dry brine for fish?
A wet brine submerges the fish in salted water and adds a little moisture while it seasons; it is faster and it is the method for cooking and for most home smoking. A dry cure (gravlax, or a salt and sugar rub before smoking) puts the salt straight on the flesh, pulls water out, and gives a firmer, denser result. This calculator's cooking and smoking modes are wet brines; the gravlax mode is a dry cure at 3 to 4% salt of the fish's weight plus an equal weight of sugar.
How long can I safely brine shrimp?
15 to 30 minutes in a 3.5 to 5% brine; the calculator holds shellfish at 15 minutes for pieces under an inch. An hour makes them soft and salty. A common alternative is a dry brine of 1 teaspoon Diamond Crystal (2.8 g) plus 1/4 teaspoon baking soda per pound for 15 to 30 minutes, which keeps them snappy when cooked.
What prevents the white stuff from appearing on cooked salmon?
That is albumin, a protein pushed out of the muscle when it contracts under high heat. A 10 to 15 minute soak in a 5% brine firms the surface proteins so much less of it leaks out. Cooking at a lower temperature and not overcooking (145°F, 63°C, at the thickest point per foodsafety.gov) does the rest.
Can I reuse seafood brine?
No. Once raw fish has sat in it the brine carries bacteria and protein from the fish, and its salt percentage has dropped by an unknown amount. Discard it, wash the container, and mix a fresh batch; the salt costs pennies.
Does the type of salt matter for brining?
By weight, no: 47 g of salt is 47 g of salt. By volume, yes: a cup of table salt weighs about 288 g and a cup of Diamond Crystal about 134 g (from each maker's nutrition label), so table salt carries about 2.1 times the salt per spoon. The calculator computes grams first and then prints spoons for the salt you pick. Unrefined salts such as Redmond Real Salt (about 96% sodium chloride) and Celtic light grey (about 81%, sold moist) are weighed up so the brine still lands on the percentage. Iodized table salt works but can taste faintly metallic; curing salts have no place in a fish brine.
What temperature should I keep brine at?
32 to 40°F (0 to 4°C) the whole time, so in the refrigerator, never on the counter. If you dissolve the salt in hot water, chill the brine fully before the fish goes in. Oregon State's smoked fish guidance goes a step further for smoking brines: any brine longer than 4 hours should sit at 38°F (3.3°C) or below, and finished smoked fish is stored at 38°F or below.
How long do you brine salmon before smoking?
About 5.5 hours per inch of thickness in the default 6% brine, 8 hours per inch at 5%, and 3 hours per inch at 8%, with a 12 hour ceiling. A 2 lb, 1 inch fillet in 2 quarts of 6% brine takes 114 g of salt, an equal weight of brown sugar if you want it, and 5.5 hours. Then 1 to 3 hours uncovered in the fridge for the pellicle, and a hot smoke that brings the center to 145°F (62.8°C) and holds it there for at least 30 minutes.
References
- FDA, Fish and Fishery Products Hazards and Controls Guidance
- Oregon State University Seafood Network, Smoked Fish compendium, chapter 7 (quotes the FDA salt, temperature, and storage figures)
- Pacific Northwest Extension (Oregon State), Smoking Fish at Home Safely
- foodsafety.gov, safe minimum internal temperatures
- Morton, Coarse Kosher Salt nutrition facts (1/4 tsp = 1.2 g)
- Diamond Crystal Salt (label: 1/4 tsp = 0.7 g)
- America's Test Kitchen, the wrong kind of salt could ruin your dinner
- ThermoWorks blog (thermometer placement and pull temperatures)
Disclaimer
Educational purpose only: this calculator and the information provided on this page are intended for educational and informational purposes only. The calculations, recommendations, and guidelines presented are based on commonly accepted culinary practices and publicly available food science resources.
Not professional advice: the content on this website does not constitute professional culinary, nutritional, medical, or food safety advice. Always consult qualified professionals for specific guidance related to food preparation, dietary requirements, or health concerns.
Food safety responsibility: you are solely responsible for ensuring the safety of the food you prepare. Brining times, temperatures, and techniques may need to be adjusted based on your specific circumstances, equipment, and ingredients. Always follow current USDA, FDA, and local health department guidelines for safe food handling and preparation.
Individual results may vary: factors such as seafood freshness, thickness variations, refrigerator temperature, salt brand differences, and environmental conditions can affect brining results. The times and measurements provided are estimates based on typical conditions and should be used as starting points.
Allergen warning: seafood is a common allergen. If you or anyone consuming the food has shellfish or fish allergies, take appropriate precautions and consult with a healthcare provider.
Special ingredients caution: some specialty salts (particularly curing salts containing sodium nitrite) require careful handling and precise measurements. Always follow manufacturer guidelines and do not exceed recommended usage amounts.
No warranty: BrineCalculators.com makes no warranties, expressed or implied, regarding the accuracy, completeness, or reliability of the information provided. Use this calculator at your own risk. See the full disclaimer. For the most current food safety guidelines, visit FoodSafety.gov.