The pH level of Pepsi is approximately 2.5. The pH level is a measure of the acidity or alkalinity of a substance. The pH or potential of hydrogen scale starts at 0 and ends at 14.
A pH of 7 is considered neutral, and a high pH level indicates that a substance is more alkaline. Water has a pH level of 7.0, so it is a neutral liquid. With a pH of 2.49, Pepsi is considered an acidic substance. Its sugar content is 27 grams. Pepsi One has a pH level of 3.05. Beverages that are acidic and contain sugar can cause teeth erosion.