How many grams of protein are in 1/4 cup of black beans?
                                
                                
                                •
                                
                                
                        
                                    
                                    3 min read                                
                            
                                According to the USDA National Nutrient Database, one cup of cooked black beans contains 15.2 grams of protein, a figure that is significantly reduced for a smaller serving. So, exactly how many grams of protein are in 1/4 cup of black beans depends on how they are prepared, making the answer far from a simple, single number.