What a brine percentage actually means
A brine percentage is a ratio of salt to something else by weight, and cooks routinely mean two different somethings. That single ambiguity is why one recipe's 5% brine tastes mild and another's is inedible.
Classic brine strength describes the liquid. A 5% brine is a solution that is 5% salt by weight: 52.6 g of salt dissolved in 1,000 g of water gives 1,052.6 g of brine, of which 52.6 g is salt. The meat is a passenger. You pull it out after a fixed number of hours, and how salty it ends up depends on how long it sat, how thick it was, and how cold the fridge ran.
Equilibrium brining describes the finished food. You weigh the meat and the water together, take a percentage of that combined weight, and dissolve all of it. Given enough time, salt distributes itself evenly through the whole container, so the meat lands at exactly the percentage you typed and stops. Leave it in an extra day and nothing changes, because there is no longer any concentration gradient to drive more salt in.
That is the practical difference. A classic brine is a timed process you can overshoot; an equilibrium brine is self-limiting. The trade is that equilibrium brining needs longer - a whole turkey wants two to three days rather than overnight - and that the numbers look small. A 1.5% equilibrium target is an ordinary, well-seasoned bird. Type 1.5 into a classic brine and you have made something far too weak to do anything in twelve hours.
The two formulas, and why the classic one has a denominator you did not expect
The equilibrium formula is a plain mass balance. Add up everything that the salt will eventually spread through - the meat and the water - and take your percentage of it:
salt = (meat + water) x target% / 100
Nothing else belongs in that sum. Ice counts as water once it melts; a rack, a bag or a bucket does not.
The classic formula catches people out. A 5% brine is 5% salt of the finished brine, and the salt you add becomes part of that brine. So you cannot simply take 5% of the water. Write it out: if W is water and S is salt, you want S / (S + W) = p. Solve for S and you get
salt = water x p / (1 - p)
At 5% that is 1,000 x 0.05 / 0.95 = 52.63 g per litre, not 50 g. The gap is small at weak strengths and large at strong ones: at 20% the correct figure is 250 g per litre rather than 200 g, a 25% error. Some older recipes genuinely do mean grams of salt per 100 g of water, and if a source says so explicitly, believe it - but the food-industry default, and the definition the salometer scale is built on, is salt as a fraction of the whole solution.
The salometer (also spelled salinometer) reads that same fraction on a 0-100 scale, where 100 is a fully saturated brine. Water dissolves about 26.4 g of salt per 100 g of brine at cellar and refrigerator temperatures, so one salometer degree is 0.264% salt and the conversion is °SAL = strength% / 26.4 x 100. A 5% brine reads 18.9°. Commercial curing brines are almost always specified in degrees rather than percent, which is why the reading appears among the outputs here.
Sugar in a brine is dosed on the same basis as the salt: this calculator takes your sugar percentage of the same weight the salt was taken from. Sugar contributes browning and blunts the perception of salt; it does not preserve anything at brine concentrations.
Worked example: a 12 lb turkey, 6 quarts of water, 1.5% equilibrium
Follow it through in grams - the arithmetic is trivial once everything is in one unit.
- Convert the meat. 12 lb x 453.59237 = 5,443.1 g.
- Convert the water. 6 US quarts x 946.353 g/qt = 5,678.1 g. Water is 1 g per mL, so volume and weight are interchangeable.
- Add them. 5,443.1 + 5,678.1 = 11,121.2 g in the bucket.
- Take the percentage. 11,121.2 x 0.015 = 166.8 g of salt.
- Convert to a measure. Diamond Crystal kosher is about 2.8 g per teaspoon, so 166.8 / 2.8 = 59.6 tsp, which is 1.24 cups. Morton kosher at 4.8 g/tsp is 34.8 tsp, or 0.72 cup. The same 166.8 g is 0.58 cup of table salt. Three very different scoops, one identical result.
- Check the liquid strength. The brine itself weighs 5,678.1 + 166.8 = 5,844.9 g, of which 166.8 g is salt: 2.854%. On a salometer that is 2.854 / 26.4 x 100 = 10.8°.
- Add sugar if you want it. At 0.75%, 11,121.2 x 0.0075 = 83.4 g, about 1/3 cup of granulated sugar.
Notice how weak the liquid is - under 3% - compared with the 5-6% of a traditional overnight brine. That is the point. The bucket contains exactly the salt the finished bird should carry and no more, so three days in the fridge cannot make it salty. Pair it with the turkey thawing time calculator so the bird is fully defrosted before it goes in, and the turkey cooking time calculator for the roast itself.
How to read the result and pick a target
Judge the number by what the finished meat should taste like, not by the strength of the liquid.
Most people find cooked meat pleasant somewhere between 0.8% and 1.5% salt by weight, which is why the equilibrium targets on this page cluster there. Commercially cured products sit higher: bacon and ham are typically salted well above 2%, and they are eaten in thin slices for that reason. Anything you plan to eat as a portion belongs in the lower band.
For classic brining, the useful range is roughly 5% to 6% for an overnight soak of poultry or pork, dropping to 3% if the meat will sit for two or three days and rising towards 8-10% only for short, aggressive brines on thin cuts. The reason is diffusion: salt moves into meat slowly and from all faces at once, so a thin chop in a strong brine reaches an unpleasant level in an hour or two while a whole bird in the same liquid is still under-seasoned after eight.
The equilibrium salt in the system output is the honest ceiling on any brine, classic or not. It is the salt divided by everything in the container, and it tells you where the meat would end up if you forgot about it. On the classic side that number is normally well below the brine strength, because the meat dilutes the salt as it absorbs it. If it comes out above about 2%, your brine is strong enough that leaving the meat in too long will genuinely ruin it, and you should treat the timer as a hard constraint.
Two effects the number cannot capture: brined meat holds more water, so it weighs 5-10% more coming out than going in, and it loses less of that water during cooking. That is why brining reads as juicier even when the meat is cooked to the same internal temperature.
Salt per litre and per quart of water at each classic brine strength
| Brine strength | Salt per litre of water | Salt per US quart | Salometer | Table salt per quart |
|---|---|---|---|---|
| 1% | 10.1 g | 9.6 g | 3.8° | 1.6 tsp |
| 2% | 20.4 g | 19.3 g | 7.6° | 3.2 tsp |
| 3% | 30.9 g | 29.3 g | 11.4° | 4.9 tsp |
| 4% | 41.7 g | 39.4 g | 15.2° | 6.6 tsp |
| 5% | 52.6 g | 49.8 g | 18.9° | 8.3 tsp |
| 6% | 63.8 g | 60.4 g | 22.7° | 10.1 tsp |
| 8% | 87.0 g | 82.3 g | 30.3° | 13.7 tsp |
| 10% | 111.1 g | 105.2 g | 37.9° | 17.5 tsp |
| 26.4% (saturated) | 358.7 g | 339.4 g | 100.0° | 56.6 tsp |
Teaspoons are for table or pickling salt at 6.0 g/tsp. Divide the gram figure by 2.8 for Diamond Crystal kosher or 4.8 for Morton kosher.
A cup of salt is not a unit of salt
Diamond Crystal kosher salt weighs about 2.8 g per teaspoon; Morton kosher about 4.8 g; table and pickling salt about 6.0 g. A recipe calling for one cup of kosher salt therefore means anywhere from 134 g to 230 g depending on which box was on the counter - a 71% spread, and easily the difference between a good brine and a ruined one. Every brine recipe you find in volume was written for one specific brand. Weigh the salt, and the ambiguity disappears.
Mistakes that wreck a brine
- Taking the percentage of the water in equilibrium mode. The meat is part of the system. Omitting it makes the brine roughly twice as strong as intended for a typical meat-to-water ratio.
- Guessing the water volume. Fill the container with the meat already in it, then pour the water off and measure it. Estimating from the container size overstates the water and under-salts the meat.
- Forgetting that ice is water. Chilling a hot-dissolved brine with 1 kg of ice adds 1 kg of water and dilutes everything by that much. Count it.
- Brining a kosher, koshered or enhanced product. Supermarket turkeys and pork loins are often pre-injected with a salt solution, usually declared as a percentage on the label. Brining them again stacks salt on salt.
- Using a classic-strength number in equilibrium mode. A 5% equilibrium target means the finished meat is 5% salt, which is cured-ham territory and not edible as a portion.
- Leaving meat in a strong brine past the timer. Check the equilibrium figure this page reports: it is where the meat is heading, and with a strong brine that destination is inedible.
- Brining above 40 °F. The brine and the meat must stay at refrigerator temperature throughout. A bucket on the counter is a bacterial incubator, whatever the salt level.
Wet brine, dry brine, cure and ferment: choosing the right tool
All four are salt-percentage problems, and they differ in what the percentage is taken of.
Dry brining (pre-salting) skips the water entirely: you rub salt on at a percentage of the meat weight and let the meat's own moisture make the brine. It gives crisper skin because you are not adding water to the surface, and it takes no bucket space. The arithmetic is in the dry brine salt calculator.
Curing adds sodium nitrite to the salt, and that changes the problem from taste to regulation. Nitrite is dosed in parts per million against a legal ceiling, not in percent, and it is what makes bacon, ham and cured sausage safe from Clostridium botulinum at low temperatures. Never substitute curing salt for table salt in these brines by weight - use the curing salt nitrite ppm calculator.
Vegetable fermentation uses salt to select for lactic acid bacteria rather than to season, and the percentage is taken of the vegetables, the water, or both, depending on the method. That is the fermentation salt percentage calculator.
Sausage seasoning is a straight percentage of the meat block, alongside fat ratio and binder, in the sausage seasoning calculator.
One more limit worth stating plainly: a brine is not a preservative at these strengths. A 5% brine slows spoilage bacteria a little and does nothing to pathogens. Brined meat is raw meat, it belongs in the refrigerator, and it needs to be cooked to a safe internal temperature - which for whole poultry means 165 °F measured in the thickest part of the thigh.
Key terms
- Equilibrium brining
- Salting a container of meat and water so that the whole system, once mixed and rested, sits at the salt level you want. Self-limiting: extra time cannot make it saltier.
- Brine strength
- Salt as a percentage of the total weight of the brine solution, salt included. The industry default and the basis of the salometer scale.
- Salometer (salinometer)
- A hydrometer graduated 0-100, where 100 is a brine saturated with salt (about 26.4% by weight). Read it at the temperature the scale is calibrated for, usually 60 °F.
- Saturation
- The maximum salt water will hold: roughly 26.4 g per 100 g of brine, and almost unchanged between refrigerator and room temperature. Adding more salt just leaves crystals on the bottom.
- Enhanced meat
- Meat sold already injected with a salt or phosphate solution, usually labelled with a percentage such as 'contains up to 12% of a solution'. It is already brined.
- Pickle (curing)
- The trade word for a curing brine. A 'cover pickle' is the brine a whole muscle sits in; a 'pump pickle' is injected.