Pregnancy Due Date Calculator
Your estimated due date, how far along you are and key milestones.
Estimated due date
Milestones
For information only — not a diagnosis or medical advice. Nothing you enter is sent or stored.
How to use Pregnancy Due Date Calculator
- Enter the first day of your last menstrual period.
- Adjust your usual cycle length if it isn't 28 days.
- Click “Calculate” to see your due date, current week and milestones.
Frequently asked questions
How accurate is the due date?
It's an estimate — only about 1 in 20 babies arrive on their due date. An early ultrasound gives a more precise date.
Why does cycle length matter?
Ovulation usually happens about 14 days before the next period, so longer cycles shift conception and the due date later.
Can this replace a doctor?
No. This tool gives general estimates and self-checks for information only. It does not diagnose anything. Please see a qualified health professional for medical advice, and seek urgent care if you feel unwell.
Is Pregnancy Due Date Calculator free?
Yes. Pregnancy Due Date Calculator is free to use with no sign-up and no watermark.
Is my information saved or sent anywhere?
No. Everything is calculated in your browser. Nothing you enter is sent to a server or stored.
Does it work on my phone?
Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.