Crude Protein Calculator
Calculate crude protein content using Kjeldahl method, nitrogen analysis, and protein conversion factors for food and feed analysis.
Enter Analysis Data
g
mL
mL
N
%
%
%
%
Results
Enter analysis data to calculate crude protein
Crude Protein Analysis
Kjeldahl Method
% Protein = % N × Conversion Factor
- • Digestion with H₂SO₄
- • Distillation of NH₃
- • Titration with HCl
- • Most common method
Conversion Factors
- • General: 6.25
- • Wheat: 5.7
- • Dairy: 6.38
- • Soy: 5.83
- • Meat: 6.25
Protein Sources
Plant Sources
- • Soybean meal: 45-50%
- • Wheat flour: 10-15%
- • Corn meal: 8-10%
- • Rice bran: 12-15%
Animal Sources
- • Meat meal: 50-60%
- • Fish meal: 60-70%
- • Milk powder: 25-35%
- • Blood meal: 80-90%
Feed Ingredients
- • Cottonseed meal: 40-45%
- • Sunflower meal: 35-40%
- • Peanut meal: 45-50%
- • Canola meal: 35-40%
Applications
Food Industry
- • Nutritional labeling
- • Quality control
- • Product development
- • Regulatory compliance
Feed Industry
- • Feed formulation
- • Nutritional analysis
- • Cost optimization
- • Quality assurance