#1413 · Health Tool

Pregnancy Due Date Calculator

Estimate your pregnancy due date from last menstrual period and cycle length. The calculator also shows current week, trimester, days remaining, and milestone timing.

Calculator

Pregnancy date inputs
Date
days
Date
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How to use this calculator

  • Enter the requested measurements or dates.
  • Choose the option that best matches your goal or method.
  • Click Calculate.
  • Review the result card, score, interpretation, and recommendation.

What the result means

The result is an estimate designed to support practical wellness decisions. Use the score, benchmark, and gap metrics as planning references rather than medical diagnosis.

Estimated due date = LMP + 280 days + (cycle length − 28). Current pregnancy day = current date − LMP adjusted by cycle length.

This calculator provides educational wellness estimates only and is not a substitute for professional medical advice, diagnosis, or treatment.

Example calculation

With an LMP of January 10 and a 28-day cycle, the estimated due date is around October 17. Current week and trimester depend on the selected current date.

Tips for better results

  • Use consistent measurements and update results over time.
  • Treat the result as a decision-support estimate, not a diagnosis.
  • For medical, pregnancy, fertility, or high-intensity training decisions, consult a qualified professional.

FAQ

How is my pregnancy due date calculated?

A common estimate adds 280 days to the first day of the last menstrual period.

Can cycle length change my due date?

Yes. Longer or shorter cycles can shift the estimate because ovulation timing may differ.

How accurate is Naegele’s rule?

It is a useful estimate, but many births occur before or after the calculated date.

What week is considered full term?

Full term is commonly considered around 39 to 40 weeks in clinical pregnancy dating.

Why does ultrasound sometimes change the due date?

Early ultrasound can provide more precise dating when cycle dates are uncertain.

Result module guide

MetricMeaning
Main ResultPrimary estimate shown in the result card
Health Score0–100 score for quick interpretation
BenchmarkReference range or category used for interpretation
RecommendationAutomatic comment based on the result

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