Bacon Cure Calculator — Equilibrium Curing Sizer

Calculate precise equilibrium curing ratios for pork belly bacon, Canadian bacon, pancetta, and charcuterie. Engineered for home cooks, pitmasters, and charcuterie craftsmen using USDA FSIS nitrite safety limits and Marianski osmotic penetration models.

Raw, trimmed meat weight
Determines curing duration
KOSHER / SEA SALT 44.6 g Pure non-iodized coarse salt
PRAGUE POWDER #1 (INSTACURE #1) 5.7 g Provides ~156 PPM Nitrite
SUGAR (BROWN/MAPLE) 27.2 g
MINIMUM CURE TIME 9 Days
SAFE WINDOW 16 Days
Equilibrium Diffusion Blueprint & Salt Penetration

Marianski osmotic diffusion model: Vacuum-sealed bag maintains 100% moisture contact for continuous inward salt absorption.

1.75″ Slab (9 Days Min)
Equilibrium Meat Curing Osmotic Diffusion Blueprint Diagram showing vacuum bag perimeter, brine diffusion gradient towards meat core, and measured spice dosages. SEALED VACUUM BAG (AIRTIGHT EQUILIBRIUM ENVIRONMENT) MEAT CORE (OSMOTIC PENETRATION TOWARD CENTER) 44.6g Kosher Salt 5.7g Cure 27.2g Sugar
⏱️ Refrigeration Timeline: Minimum 9 days at 34°F–38°F. Equilibrium curing cannot over-salt; safe window extends to 16 days.
USDA FSIS Compliance: Sized strictly to safe ingoing nitrite limits (120–200 PPM) for commercial and home curing safety.
Marianski Diffusion Engine: Automatically calculates minimum refrigeration days based on measured slab thickness.
US vs European Salt Toggle: Seamlessly converts between American Prague Powder #1 (6.25% NaNO2) and European Nitritpökelsalz (0.6% NPS).
Dual-Unit Weight Input: Enter measurements in grams, pounds, or kilograms with real-time decimal precision.
Airtight Vacuum Bag Ratios: Formulated specifically for sealed bag curing where over-salting is chemically impossible.
1-Click Job-Site Recipe Export: Copies clean ingredient checklists formatted for kitchen prep tables and scales.

Standard Equilibrium Curing Ratio Matrix

Target percentages for whole-muscle charcuterie, bacon, and dry-cured meats:

Cured Cut Salt % Sugar % Curing Salt Standard Typical Thickness Min Days in Fridge
Classic Pork Belly Bacon → 2.2% 1.2% Cure #1 (6.25%) 1.75″ 9 Days
Canadian Bacon (Pork Loin) → 2.2% 1% Cure #1 (6.25%) 3″ 14 Days
Pancetta (Italian Cured Belly) → 2.5% 0.5% Cure #2 (Dry) 1.5″ 8 Days
Beef Bresaola (Eye of Round) → 2.6% 0.4% Cure #2 (Dry) 2.5″ 12 Days
Duck Breast Prosciutto → 2.4% 0.5% Cure #1 (6.25%) 1″ 6 Days
Salt-Only Heritage Bacon (No Nitrites) 2.5% 1% Salt Only 1.75″ 9 Days

How the Marianski Diffusion Formula Calculates Curing Days

In a sealed vacuum bag, salt and sodium nitrite dissolve into moisture drawn from the meat surface to create a concentrated brine. By osmotic diffusion, this brine penetrates deeper into the core at approximately 1/4 inch (6.35 mm) per 24–36 hours under strict refrigeration (34°F–38°F).

Because equilibrium curing adds only the exact target percentage of salt (unlike excess salt-box dredging), it is impossible to over-salt meat. If a 2-inch slab reaches equilibrium on Day 10, leaving it in the refrigerator for 16 days will not make it saltier.

Frequently Asked Questions About Meat Curing

What is equilibrium curing (EQ curing) and why is it safer?

Equilibrium curing calculates the exact percentage of salt and curing salt relative to the total weight of the meat, sealed in an airtight vacuum bag. Because only the exact target amount of salt is added (typically 2.0% to 2.5%), the meat absorbs salt until it reaches equilibrium. Unlike traditional salt-box methods, meat cured via the equilibrium method can never become over-salty, even if left in the refrigerator for extra days.

How long does bacon need to cure based on meat thickness?

Salt and sodium nitrite penetrate meat at a rate of roughly 1/4 inch (6 mm) per 24 to 36 hours. Using the Marianski diffusion formula: Cure Days = (Thickness in Inches × 4) + 2 days baseline safety buffer. A standard 2-inch thick pork belly requires a minimum of 10 days in the refrigerator to reach equilibrium at the core before smoking.

Can I substitute European Nitritpökelsalz (NPS) for US Prague Powder #1?

No, they cannot be substituted 1:1. US Prague Powder #1 contains 6.25% sodium nitrite, while European Nitritpökelsalz (NPS / Peklosol) contains only 0.5% to 0.6% sodium nitrite. Using US Cure #1 at European dosages will cause dangerous nitrite toxicity, while using European NPS at American dosages will result in severe under-curing and botulism risk. Our calculator features an automatic toggle between both standards.

What is the difference between Prague Powder #1 and Prague Powder #2?

Prague Powder #1 (InstaCure #1) contains 6.25% sodium nitrite and 93.75% table salt; it is used for cured meats that are cooked, smoked, or refrigerated (such as bacon, hams, and jerky). Prague Powder #2 contains 6.25% sodium nitrite plus 4.0% sodium nitrate; it is designed strictly for long-term dry-cured meats aged for weeks or months (such as salami, bresaola, and prosciutto) where nitrate slowly breaks down into nitrite over time.

What temperature should the refrigerator be during equilibrium curing?

Keep your curing refrigerator between 34°F and 38°F (1°C to 3.5°C). Temperatures below 34°F slow salt diffusion significantly, while temperatures above 40°F (4.4°C) enter the food safety danger zone for bacterial growth before curing salts fully penetrate the core.