Due Date Calculator

Calculate your estimated pregnancy due date based on your last menstrual period or conception date. View your full trimester timeline and week-by-week pregnancy milestones.

Used 12.7K times today

First Day of Last Menstrual Period (LMP)

How to Use Due Date Calculator

1

Enter your last menstrual period

Select the first day of your last menstrual period (LMP). This is the standard starting point used by healthcare providers.
2

Adjust for cycle length (optional)

If your cycle is shorter or longer than the standard 28 days, adjust the cycle length for a more accurate estimate.
3

View your due date and milestones

See your estimated due date, your current week of pregnancy, trimester boundaries, and key developmental milestones.

Frequently Asked Questions

How is the due date calculated?

The standard method (Naegele's Rule) adds 280 days (40 weeks) to the first day of your last menstrual period. This assumes a 28-day cycle with ovulation on day 14.

How accurate is the estimated due date?

Only about 5% of babies are born exactly on their due date. The EDD is an estimate — full-term delivery can occur anywhere between 37 and 42 weeks. An ultrasound in the first trimester provides the most accurate dating.

Can I calculate by conception date instead?

Yes. If you know your conception or ovulation date, add 266 days (38 weeks) to it to estimate your due date.

About Due Date Calculator

The Due Date Calculator on Utilko helps expectant parents estimate their pregnancy due date and track their journey week by week. Using Naegele's Rule — the same method used by OBGYNs worldwide — the calculator adds 280 days to your last menstrual period to produce your Estimated Due Date (EDD).

Beyond the due date, the tool displays your full trimester timeline and key pregnancy milestones so you always know what to expect at each stage. No personal data is stored, and all calculations happen instantly in your browser.

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