The pH of the stomach is always on the acidic side of the pH scale, but it varies from a pH below 3.0 to a pH between 5.0 and 6.0. Stomach pH is lowest when food is being digested and highest when the stomach is empty. The reason the stomach […] What Is the pH of the Stomach? This entry was posted on April 29, 2020 by Anne Helmenstine (updated on May 10, 2021)