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Pregnancy Due Date Calculator

Estimate your baby's due date from your last menstrual period (LMP) using Naegele's rule.

How to use this tool

  1. 1Paste or type your input above.
  2. 2The result updates instantly.
  3. 3Copy the output with one click.

Frequently asked questions

How is a due date calculated?+

Naegele's rule adds 280 days (40 weeks) to the first day of your last period. Only about 5% of babies arrive exactly on the due date.

Is this a substitute for medical advice?+

No. These calculators are for general information and education only. Consult a qualified healthcare professional for personal medical advice.

Is my data private?+

Yes. The tool runs entirely in your browser β€” nothing you paste or type is uploaded to a server.

Guides & deep dives

How Your Due Date Is Calculated (and How Accurate It Is)

Learn how Naegele's rule, LMP, and ultrasound dating work together to set your due date β€” and why only about 5% of babies arrive on that exact day.