What Is the Normal Thickness of the Endometrial Lining?

The Advanced Fertility Center of Chicago states that anywhere between 8 and 13 millimeters is considered a good level of endometrial lining thickness when it comes to creating and maintaining a viable pregnancy. The lining has the potential to be problematic when it is too thin and measures fewer than 6 millimeters. An endometrial lining with a thickness of 15 millimeters or more has the potential to reduce the likelihood of a successful pregnancy.