Pregnancy / Due Date Calculator
Calculate your estimated due date using the LMP (Last Menstrual Period) method — the most widely used and accurate clinical method.
How This Pregnancy / Due Date Calculator Works
This pregnancy calculator uses the globally accepted clinical method: your due date is calculated as 280 days (40 weeks) from the first day of your Last Menstrual Period (LMP). This approach is simple, accurate, and widely used by doctors and hospitals.
Based on your LMP date, the calculator determines your estimated due date, current gestational age, trimester, and remaining time in your pregnancy. The tool works entirely on your device — no data is stored or sent anywhere.
This is a fast and helpful way to understand your pregnancy timeline, plan your checkups, and track your baby’s development.
Frequently Asked Questions
How is the due date calculated?
The due date is calculated as LMP + 280 days (40 weeks), which is the standard method used worldwide.
Is the due date always 100% accurate?
No. Most babies are born between 37 and 42 weeks. The due date is an estimate, not a guarantee.
Do I need to enter anything else?
No. You only need your LMP date. All other calculations are done automatically.
Is my information stored?
No. Everything is calculated instantly in your browser. Nothing is saved or sent to any server.