How Big is Iceberg Lettuce? Understanding Average Size and Weight
                                
                                
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                                    5 min read                                
                            
                                A mature head of iceberg lettuce typically averages between 25-30 centimeters (10-12 inches) in diameter, while some harvested heads can be smaller, around 4-6 inches. This dense, crisphead lettuce varies in weight depending on its size, with an average medium head weighing about 539 grams, or just over a pound.