Calculate estimated due date and week of pregnancy from last menstrual period.
Frequently Asked Questions
How do I use the Pregnancy & Due Date Calculator?
Enter the relevant values in the fields, and the calculator returns a result using the formula and rules documented on the page.
Are my inputs stored?
No. The calculation runs in the browser, and the entered values are not sent to the server for the calculation.
When should I recalculate?
Recalculate whenever the inputs, units, or assumptions change.