Due Date Calculator
Estimate your pregnancy due date and current week from the first day of your last period.
Due Date Calculator
مقررہ تاریخ کیلکولیٹر
Results
Detailed Breakdown
| Trimester | Weeks | Dates | Key Milestones |
|---|---|---|---|
| First | 1–13 | 8/27/2026 → 11/19/2026 | Conception, first scan, nuchal translucency test |
| Second | 14–27 | 11/26/2026 → 2/25/2027 | Anomaly scan, foetal movement, gender reveal |
| Third | 28–40 | 3/4/2027 → 5/27/2027 | Growth scans, glucose test, delivery planning |
About the Due Date Calculator
The due date calculator estimates when a pregnancy will reach full term based on the first day of the mother's last menstrual period (LMP). The standard method adds 280 days (40 weeks) to the LMP — the length of an average pregnancy — giving the expected date of delivery that doctors and hospitals in Pakistan use as the reference point for the entire antenatal schedule.
The LMP method works because conception typically occurs about two weeks after the first day of the last period, and the average pregnancy lasts roughly 38 weeks from conception — which totals 40 weeks from the LMP. For women with regular 28-day cycles, this estimate is remarkably reliable; for irregular cycles, the doctor will adjust the dates using ultrasound measurements in the first trimester.
The calculator also shows the current week of pregnancy, counted from the LMP. Knowing the week matters because it determines which antenatal checks are due: the first ultrasound is usually around weeks 8–12, the anomaly scan around 18–22 weeks, and glucose screening around 24–28 weeks. Pakistani hospitals follow this same international schedule.
It is essential to treat the date as an estimate. Only about 5% of babies are born on their exact due date; most arrive within two weeks either side, which is considered normal. Babies born between 37 and 42 weeks are generally considered full term. Your obstetrician will refine the date with early ultrasound and monitor progress at each visit.
Use this calculator when you first learn of a pregnancy to mark the timeline, then let your doctor's scans take over for precision. It is a planning tool — for medical advice and care decisions, always follow your healthcare provider.
How to estimate your due date
- 1
Note the first day of your last menstrual period (LMP).
- 2
Enter that date in the calculator.
- 3
Read your estimated due date — 280 days after the LMP.
- 4
Read your current week of pregnancy, which updates against today's date, and use it to track antenatal appointments.
Frequently Asked Questions
How accurate is the due date?
Only about 5% of babies are born exactly on the due date; it is an estimate around week 40. Your doctor will confirm with scans.
How accurate is the due date from LMP?
The LMP method is most accurate for women with regular 28-day cycles. Only about 5% of babies are born exactly on the due date; delivery any time between 37 and 42 weeks is considered normal. Early ultrasound provides the most precise dating.
What if my cycle is irregular?
If your cycles are irregular, the LMP method may be less accurate. Your doctor will typically use a first-trimester ultrasound to date the pregnancy more precisely and adjust the due date accordingly.
When is the best time for the first scan?
The first ultrasound is usually performed between 8 and 12 weeks. It confirms the pregnancy, checks the heartbeat, and provides the most accurate dating — especially valuable if your LMP is uncertain.
Is the baby considered late after the due date?
Pregnancies are generally considered post-term at 42 weeks. Before that, doctors monitor mother and baby and may discuss induction around 41 weeks depending on the situation. Your obstetrician will guide the timing.