Pregnancy Calculator
Find out how far along you are and your estimated due date, based on your last menstrual period.
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Current weeks
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How to use the Pregnancy Calculator
- Enter the first day of your last menstrual period.
- Read your current week of pregnancy and estimated due date.
Frequently asked questions
How is the due date calculated?
Using Naegele's rule: 280 days (40 weeks) after the first day of your last menstrual period. Your doctor's ultrasound-based estimate may differ slightly.