Get exact grams of salt, curing salt, and sugar for safe equilibrium curing.
Curing salt is a mixture of sodium chloride (table salt) and sodium nitrite, sometimes with the addition of sodium nitrate. It is dyed pink so it cannot be accidentally confused with regular table salt, since using the wrong amount — or confusing it with regular salt — can be dangerous. Curing salt serves two essential functions: it inhibits the growth of Clostridium botulinum, the bacteria responsible for botulism, and it fixes the characteristic pink color and distinctive cured flavor of products like bacon, ham, and corned beef. Without curing salt, cooked pork belly would be brown and taste like roasted pork, not bacon. The curing reaction between nitrite and myoglobin in the meat is what produces that signature pink hue and preservative effect.
Equilibrium curing — the method used in this calculator — is the safest and most reliable dry-curing technique for home charcutiers. Rather than applying an excess of cure and hoping the meat absorbs the right amount, you calculate the exact weight of salt and curing salt needed based on the meat's weight, mix them together, and rub the entire mixture onto the meat. The meat absorbs exactly what was applied, so there is no rinsing or guessing. The only non-negotiable requirement is weighing on a scale accurate to 0.1 grams. Volume measurements like teaspoons are not precise enough for curing salt — even small errors in sodium nitrite dosing matter for safety.
Regular table salt (sodium chloride) is used purely for flavor and some moisture-drawing. It will not prevent botulism growth in an anaerobic (low-oxygen) curing environment. Curing salt — sold as Prague Powder, Instacure, or pink curing salt — is a precisely formulated blend of sodium chloride and sodium nitrite (and sometimes nitrate), dyed bright pink to prevent mix-ups. The nitrite is the active preservative ingredient. When you cure meat in a bag, a vacuum seal, or a dense salt pack, you create conditions that favor anaerobic bacteria like Clostridium botulinum. Curing salt eliminates that risk. Never substitute table salt, sea salt, or Himalayan pink salt for curing salt — they contain zero nitrite and provide no protection against botulism.
The standard equilibrium cure ratio for Pink Salt #1 is 0.25% of the meat's weight — that is 2.5 grams of curing salt per kilogram, or approximately 1.13 grams per pound of meat. For a 5-pound pork belly, that works out to about 5.7 grams of curing salt (Pink Salt #1). This ratio produces approximately 150 parts per million (ppm) of sodium nitrite in the cured meat, which is well within the FDA-permitted maximum of 200 ppm for cured pork products. Do not increase this ratio thinking it will make a safer or longer-lasting product — excess nitrite is harmful and does not improve preservation beyond the effective concentration. Use the calculator above to get the exact gram weight for your specific piece of meat.
Prague Powder #1 (Cure #1, Instacure #1) contains 6.25% sodium nitrite and 93.75% sodium chloride. It is used for products that are cured and then cooked within 30 days — bacon, ham, corned beef, pastrami, hot dogs, and fresh sausages. The nitrite breaks down quickly during cooking, leaving no significant residue. Prague Powder #2 (Cure #2, Instacure #2) contains sodium nitrite plus sodium nitrate, which acts as a slow-release reservoir that converts to nitrite over time. Cure #2 is intended exclusively for dry-aged, uncooked products like prosciutto, coppa, salami, and dry-cured whole hams that ferment and dry for weeks or months. Never use Cure #2 in a product that will be cooked, as the residual nitrate levels are not suitable for short-cure applications.
It depends entirely on the product and how it was cured. Traditional whole-muscle dry-cured products like prosciutto, bresaola, or country ham that have been properly cured, dried to a water activity below 0.85, and aged for the appropriate time are shelf-stable and can be stored at room temperature or in a cool cellar. However, home-cured bacon, corned beef, pastrami, and similar products made with Cure #1 are NOT shelf stable after curing — they must be refrigerated (at or below 40°F) and treated the same as any raw or cooked meat. Curing extends safety margins and prevents botulism during the curing process, but it does not make modern wet-or-equilibrium-cured products safe to leave unrefrigerated for extended periods once the curing is complete.
Using the equilibrium dry-cure method, bacon made from pork belly typically requires 7 to 10 days in the refrigerator. The general guideline is 1 day of cure time per half-inch of thickness at the thickest point, plus 2 extra days to ensure the cure fully penetrates to the center. A pork belly that is 2 inches thick at its thickest point would need a minimum of 4 days by that formula, but most experienced curers add a buffer and go 7 days as a minimum. After curing, the belly should be rinsed, patted dry, and then left uncovered in the refrigerator for 24 hours to form a pellicle — a tacky protein layer that helps smoke adhere evenly. Smoke the belly over indirect heat to an internal temperature of 150°F, then slice and pan-fry as you would commercial bacon.
Traditional curing before refrigeration relied on very high salt concentrations, cool cellars, smoke, and long dry-aging to create shelf-stable products. These techniques required precise environmental controls that most modern homesteads cannot replicate. For safe home curing today, refrigeration at 34–40°F is non-negotiable during the curing process. Temperatures above 40°F allow bacteria to multiply rapidly, even in the presence of curing salt. The one exception is hot-smoking, which can be done at higher ambient temperatures if the meat reaches a safe internal temperature quickly enough — but the cure phase itself must happen in the refrigerator. If you want shelf-stable cured meats without refrigeration, focus on fully dry-cured products like hard salami or traditional country ham, and follow tested, food-safety-approved recipes from established sources.