Bacon Cure and Brine Calculator

How Bacon Curing Works

Curing does two jobs at once. Salt draws water out of the pork belly, firms the texture, and lowers the water activity that spoilage organisms need. A small, measured dose of sodium nitrite does something narrower and more important: it blocks Clostridium botulinum, the bacterium whose toxin causes botulism.

That split is why this calculator treats the two ingredients differently. Salt is a matter of taste, so pick the level you like. The nitrite is a matter of chemistry, so it gets weighed.

Prague Powder #1, and only #1

Prague Powder #1 (sold as Cure #1, Insta Cure #1, or pink salt #1) is 6.25% sodium nitrite blended into ordinary salt and dyed pink so nobody mistakes it for seasoning. The dose is 2.5 g per kilogram, which lands the meat at 156 parts per million of nitrite. That figure is the standard target for bacon.

Prague Powder #2 is not a substitute. It also contains sodium nitrate, which converts to nitrite slowly over months. It exists for dry-aged salami and country ham that hang for a long time. On bacon it releases far too little nitrite in the week you actually need it.

Buy a scale that reads to 0.1 g, and do not measure cure by the spoonful. A level teaspoon varies by well over 20% depending on how you scoop, and this is the one ingredient where that margin matters. (As a rough cross-check only: a level teaspoon is roughly 5.7 g.)

Why the wet brine counts the water

In a dry cure the nitrite has nowhere to go except into the meat, so you dose against meat weight alone. A brine behaves differently. The cure disperses through the whole container, and the pork slowly equilibrates with the liquid around it, so the concentration that ends up inside the meat is set by the combined weight of meat plus water.

Dose 2.5 g per liter of water and ignore the belly sitting in it and you land nearer 105 ppm than 156, and the shortfall grows the more water you use. This calculator weighs the whole system, meat and water together.

Equilibrium brining has a pleasant side effect: it cannot over-cure. There is only ever exactly enough salt and nitrite in the container to reach the target, so an extra day or two in the fridge costs you nothing but a little more flavor. Old-style strong brines were not so forgiving, which is where the folklore about ruining bacon by leaving it too long comes from.

Cure time follows thickness, not weight

Most recipes get this backwards. Cure travels inward from the surface at roughly a quarter inch per day, so a 10 lb belly and a 2 lb belly of the same thickness finish at the same time. Total weight tells you nothing useful.

Measure the thickest part, allow a day per quarter inch plus two days of margin, and do not go below seven days for bacon no matter what the arithmetic says. Immersion runs slower than a dry rub, so wet brines get a little longer.

Flip the belly daily either way, massaging the accumulated liquid back over the surface.

After curing

1. Rinse the surface under cold water and pat dry.
2. Air-dry uncovered in the fridge for 12 to 24 hours, until the surface turns tacky. That pellicle is what smoke sticks to.
3. Hot-smoke at 180 to 200°F until the center reads 150°F, or cold-smoke below 80°F for flavor alone.
4. Chill thoroughly before slicing. Cold bacon slices cleanly, warm bacon tears.

Hot-smoked to 150°F, the bacon is fully cooked, though you will still fry it for texture. Cold-smoked bacon is raw and must be cooked before eating.

Cure in the refrigerator below 40°F (4°C) from start to finish. Never on the counter, and never in a garage or shed you are not measuring.