The density of an egg will vary slightly between each egg. To determine it exactly you will need to find its mass and its volume. Density is mass divided by volume. The average density of an egg is 1.031 g/cm 3 (grams per centimeter cubed) or 1.031g/ml (grams per milliliter). The density of water is 1 g/ml. Salt adds mass while adding very little volume so it is a good additive to make the density higher.