Pregnancy Due Date Calculator
Estimate your pregnancy due date, current trimester, and weeks pregnant based on your last menstrual period and cycle length.
* All calculations are approximate.
How Pregnancy Due Date Calculator Works?
Estimate your pregnancy due date, current trimester, and weeks pregnant based on your last menstrual period and cycle length.
Enter the first day of your last menstrual period (LMP) and your average cycle length in days.
The calculator applies Naegele's rule by adding 280 days (40 weeks) to your LMP date.
If your cycle length differs from 28 days, the calculator adjusts the due date by adding or subtracting the difference.
Your current gestational week is calculated based on the number of days since your LMP.
Results show your estimated due date, current trimester, weeks pregnant, and days remaining until delivery.
Formula Used
Due Date = LMP + 280 days + (Cycle Length - 28) days
Only about 5% of babies are born on their exact due date. An ultrasound in the first trimester provides the most accurate confirmation. Always verify with your healthcare provider.
Important — Read Before You Decide
- Only about 5% of babies are born on their exact due date — most arrive within two weeks before or after
- Due date calculations are based on Naegele's rule and assume a regular menstrual cycle
- Irregular cycles can shift the estimated due date significantly
- An ultrasound in the first trimester provides the most accurate due date confirmation
- The due date may be adjusted by your doctor after early ultrasound measurements
- A full-term pregnancy ranges from 37 to 42 weeks, not exactly 40 weeks
- This calculator is for educational purposes — always confirm with your healthcare provider
- Multiple pregnancies (twins, triplets) often deliver earlier than the estimated due date
What Happens If You Ignore These?
- Not knowing your due date makes it difficult to plan prenatal care and monitor milestones
- Incorrect due date estimation can lead to unnecessary anxiety about early or late delivery
- Missing prenatal appointments tied to gestational age can delay detection of complications
- Poor pregnancy planning may result in inadequate nutrition and preparation during critical trimesters
Smart Tips
- Track your menstrual cycle for several months to know your average cycle length
- Schedule your first prenatal visit within 8 weeks of your last period for early due date confirmation
- Each trimester has different nutritional needs — adjust your diet as pregnancy progresses
- Start taking prenatal vitamins with folic acid as early as possible, ideally before conception
- Prepare a hospital bag and birth plan by week 36 to be ready for early arrival
Frequently Asked Questions
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