Pregnancy Due Date Calculator (LMP)
Calculate your estimated due date from the first day of your last period.
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Worked example
Example: a last period starting on 1 January 2026 with a 28-day cycle.
| Estimated due date | 8 October 2026, Thursday |
|---|---|
| End of first trimester (week 13) | 2 April 2026 |
How the Pregnancy Due Date Calculator (LMP) works
Enter the first day of your last period and cycle length. Naegele's rule adds 280 days to estimate the due date; the tool also shows weeks pregnant, trimester and days left.
Formula: EDD = LMP + 280 days (+ cycle length − 28)
What to know before you calculate
A due date is 40 weeks from the first day of the last period, and most babies arrive between 37 and 42 weeks. An early ultrasound can refine the date, so follow your doctor's dating.
Tips for accurate results
Health calculators are educational estimates and not a diagnosis. Consult a doctor or dietitian before making medical or major diet decisions.
Official sources: World Health Organization.
Roman Urdu mein
Aakhri mahwari ki pehli tareekh daalein to andazan delivery ki tareekh, hamal ke hafte aur trimester mil jate hain. Final tareekh ke liye doctor se mashwara karein.
Frequently asked questions
How is the due date calculated from LMP?
Add 280 days (40 weeks) to the first day of your last menstrual period, adjusting if your cycle is not 28 days.
How many weeks pregnant am I?
Count from the first day of your last period to today. This calculator displays weeks and days automatically.
Is this calculator accurate?
It uses standard formulas and the figures configured on this site. Results are estimates for planning; confirm final amounts with the official authority, bank or institution.
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Disclaimer: results are estimates for general information. Confirm figures with the official authority, bank, institution or a qualified professional.