Pregnancy Due Date Calculator
Estimate your due date, current week and trimester.
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This calculator uses the standard method that clinics use: your estimated due date is 280 days, or 40 weeks, from the first day of your last menstrual period. Enter that date and you will see your estimated due date, how many weeks and days along you are today, which trimester you are in, and the key milestone dates along the way. It is a helpful reference between appointments.
How to use Pregnancy Due Date Calculator
- 1
Enter the first day of your last menstrual period.
- 2
Adjust your average cycle length if it is not 28 days.
- 3
See your estimated due date and current week.
Frequently asked questions
It is a standard estimate. Only about 4 percent of babies arrive exactly on the due date, and an ultrasound gives a more precise date.