The amount of juice you can extract from a lemon can vary depending on factors such as the size of the lemon, its ripeness, and how you juice it. On average, a medium-sized lemon can yield approximately 2 to 3 tablespoons (about 30 to 45 milliliters) of juice. However, larger lemons or those that are particularly juicy may yield more juice, while smaller or less juicy lemons may yield less.
To extract the most juice from a lemon, it's often helpful to roll the lemon on a countertop before cutting it in half and juicing it. Additionally, using a citrus reamer, juicer, or squeezing the lemon with your hands can help extract more juice efficiently.