Pregnancy Due Date Calculator
Estimate due date, gestational age, and days remaining from the last menstrual period.
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Estimate due date from the last menstrual period
Pregnancy Due Date Calculator estimates a due date, gestational age, and days remaining from the last menstrual period and a typical pregnancy length. It is useful for early planning, appointment preparation, family sharing, and week-by-week note taking.
Useful For
- Estimate due date from LMP
- Check gestational age and days remaining
- Plan rough appointment and preparation windows
Good To Know
Actual due dates can change based on ovulation timing, ultrasound measurements, and personal health factors. Follow your obstetrician or healthcare provider for medical decisions.
Result Check
Try an example first to understand the input flow. Before submitting, sharing, or copying important output, compare the result with the original source once more.
How It Works
Inputs are calculated or converted in the browser whenever possible. Compare important results with the original source before using them. Reviewed on Jun 27, 2026.
Due date estimate checks
Input basis
- Enter the last menstrual period or reference date carefully
- Irregular cycles can make the estimate less reliable
Interpret result
- Treat due date, gestational age, and remaining days as reference values
- Ultrasound-based dates can differ
Caution
- Do not use this for medical decisions
- Follow your clinician's guidance and medical records
Yes. The default estimate uses LMP and a 280-day pregnancy assumption. Ultrasound-based due dates may differ.
It shows estimated due date, current gestational age, elapsed days, and days remaining as reference values.
No. Cycle length, ovulation timing, and medical records can change the estimate. Follow guidance from a qualified clinician.