Pregnancy Due Date Calculator
Estimate due date from last menstrual period (LMP) or conception date. Includes an optional cycle length adjustment and a gestational age estimate.
Choose a method, enter the date, then click Calculate.
Results (estimate)
Estimated due date
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Estimated gestational age (today)
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Formula
Tool description
Due date calculators use average pregnancy lengths to estimate a due date. Actual delivery dates can vary. Clinical dating is often adjusted based on ultrasound and medical guidance.
How to use
- Select a method: from LMP or from conception date.
- Enter the date. If using LMP, set cycle length if different from 28 days.
- Calculate to see estimated due date and gestational age as of today.
- Use as an estimate and follow medical guidance for official dating.
Why it’s useful
- Get a quick estimate for planning and milestones.
- Understand approximate gestational age from dates.
- Compare LMP vs conception estimates if both are known.
Use cases & interpretation
- Milestones: estimate trimester transitions and appointment planning.
- Cycle adjustments: longer or shorter cycles can shift LMP-based estimates.
- Medical context: ultrasound and clinician dating may differ from calculator estimates.
FAQs
LMP-based estimates assume ovulation occurs about 14 days into a 28-day cycle. Conception-date estimates start closer to fertilization.
Gestational age (GA) is typically counted from LMP and is about 2 weeks longer than fetal age (time since conception), on average.
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