Due Date Calculator

Estimate your due date based on your last menstrual period, with pregnancy week tracking and key milestones.

What is a Due Date Calculator?

Calculate your estimated due date based on your last menstrual period.

See your trimester, milestones, and conception date.

How to Calculate Your Due Date

Follow these steps:

  • Enter the first day of your last menstrual period.
  • Enter your average cycle length.
  • Click calculate to see your estimated due date.
  • View trimester information and key milestones.

Tips

  • The due date is an estimate - most babies are born within 2 weeks of it.
  • Healthcare providers may adjust the due date based on ultrasound.
  • Track prenatal appointments and milestones.

Frequently Asked Questions

How is the due date calculated?+
Using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a 28-day cycle - the calculator adjusts for different cycle lengths.
Is the due date calculator accurate?+
Only about 4% of babies are born on their exact due date. Most are born within 2 weeks of it. The due date is an estimate - healthcare providers may adjust it based on ultrasound measurements.
What is the conception date?+
Conception typically occurs about 14 days after the first day of your last period (at ovulation). This adjusts with cycle length - longer cycles mean later ovulation.

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Due Date Calculator — free online pregnancy calculator, due date calculator, pregnancy due date, pregnancy calculator due date, conception date. No signup required. Works in your browser.