Pregnancy Due Date Calculator
Estimate a due date from LMP or conception using a Naegele-style rule.
Tool workspace
Naegele-style estimate only (LMP + 280 days, or conception + 266 days). Not medical advice. Processed locally in your browser.
How it works
Choose LMP (last menstrual period) or conception date. LMP adds 280 days; conception adds 266 days (Naegele-style calendar estimate).
This is not medical advice and does not replace clinical dating. Empty date clears the result—no error.
This is not medical advice and does not replace clinical dating. Empty date clears the result—no error.
Examples
- LMP 2026-01-01 → due date 2026-10-08
- Conception mode adds 266 days instead of 280
Privacy
Privacy: this tool processes dates locally in your browser. We do not log or store what you enter. Login is not required.
FAQ
Is this medical advice?
No. It is a simple calendar estimate only. Ask a clinician for medical guidance.
Is my date uploaded?
No. Estimation runs entirely in your browser.
Do I need an account?
No. All published tools work for guests without login.