Tool4SaaS

Pregnancy Calculator

Estimate due date, conception date and trimesters from last menstrual period. Enter LMP and cycle length to se. 100% private and offline.

Average cycle, typically 28 days (20–45)

Enter your last menstrual period date to calculate the due date.

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About the author

Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .

Frequently asked questions

Naegele: LMP +280 days + (cycle-28). Conception = LMP+14 days.

No, for informational purposes only. Consult a healthcare professional for personal guidance. Consult your healthcare provider.

Yes, due date math runs locally in your browser and stays private.

How to use Pregnancy Calculator

  1. Enter LMP: Pick last menstrual period date.
  2. Set cycle: Enter cycle length in days.
  3. View: See due date, trimesters and weeks.