Pregnancy Due Date Calculator
Estimate the due date from your last period (Naegele's rule, adjustable cycle) or an ultrasound, plus gestational age, trimester and key milestones.
LMP / Ultrasound → Due date
Why it is safe to use
- Runs entirely in your browser; nothing you enter is sent to a server.
- Free, with no account and no sign-up.
- Installable as an app; a tool you have opened keeps working offline.
- Open source (MIT) on GitHub.