More accurate due date calculation
A study done by Mittendorf in 1990 resulted in this (first trimester) prediction of your due date.
This Mittendorf-Williams Rule takes more factors into account, like race, coffee consumption and education.
Some studies have found the Mittendorf-Williams Rule to be more accurate than Naegele's Rule in calculating due date.
Normal Due dateCalculate your due date, the way your doctor calculates it. (Using Naegele's Rule)