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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.

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.

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