Enter your Volume of Sodium Hydroxide (V), Normality of Sodium Hydroxide (N), Equivalent Factor (F), and Weight of Sample into the Free Fatty Acid Calculator to get your Free Fatty Acid Percentage, FFA Content, and an Oil Quality Grade that tells you exactly where your oil stands.
Free Fatty Acid Percentage
--
FFA Content
--
Oil Quality Grade
--
Free fatty acid (FFA) percentage measures the amount of fatty acids not bound to glycerol in oils and fats. It's a key quality indicator that affects taste, shelf life, and processing requirements. Lower FFA values indicate better quality oil.
FFA percentage is calculated using the formula: (V × N × F) / Weight of sample, where V is volume of NaOH used, N is normality of NaOH, F is the equivalent factor, and weight is the sample mass in grams.
The equivalent factor is the molecular weight of the predominant fatty acid. For most vegetable oils, use 282 (oleic acid). For palm oil use 256 (palmitic acid), and for coconut oil use 200 (lauric acid).
Typically 0.1N NaOH is used for most FFA determinations. For samples with very low FFA content, 0.05N may be more accurate, while high FFA samples may require 0.5N solution.
Crude vegetable oils typically have 0.5-3% FFA, refined oils should be below 0.1%, and edible oils for consumption should be under 0.3%. Higher levels indicate rancidity or poor processing.
Use a representative sample of 5-20 grams, ensure it's well-mixed and at room temperature. Filter if necessary to remove particles, but avoid heating as this can affect FFA content.
Yes, but you may need to adjust the equivalent factor based on the predominant fatty acid in the animal fat. Lard typically uses 282 (oleic), while beef tallow may use 284 (stearic acid).
High FFA can result from poor storage conditions, exposure to heat and moisture, enzymatic activity, oxidation, contamination, or extended storage time. Proper handling and storage minimize FFA formation.