How much protein is in an egg ? Get the real facts behind egg protein and dispel myths surrounding this breakfast staple. How much protein is in an egg ? A medium sized egg (53g) contains 7g of complete protein – being a ‘complete protein ’ means an egg contains all 9 of the essential amino acids that we need for growth, development and repair. Eggs are a protein and nutrient powerhouse. Here is everything you need to know about hard-boiled eggs . We all know eggs are a great source of protein , but how much protein is there in one egg ? If you are wondering the same, read on.