Due Date Calculator
PregnancyPlease enter a valid LMP date (not in the future).
Cycle length must be between 20 and 45 days.
Your Pregnancy Summary
Estimated Due Date
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Weeks Pregnant
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Trimester
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Conception Date (Est.)
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Days Remaining
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Week 1
Week 13 (T2)
Week 27 (T3)
Week 40
This is an estimate based on Naegele's Rule adjusted for cycle length. Your healthcare provider will confirm your due date via ultrasound.
FAQs
How is my estimated due date calculated?
A due date is commonly estimated as about 40 weeks from the first day of your last menstrual period. However, ultrasound, especially in the first trimester, is often used to confirm or adjust pregnancy dating.
What pregnancy week means first, second, or third trimester?
A common trimester breakdown is: first trimester: weeks 1–12, second trimester: weeks 13–28, and third trimester: weeks 29–40.
Is the due date calculator always accurate?
No. A due date calculator gives an estimate. Cycle length, irregular periods, late ovulation, uncertain last period date, and ultrasound findings can change the expected due date.
When should I rely more on ultrasound than the calculator?
If you are unsure about your last period date, have irregular cycles, or conceived through assisted reproductive technology, clinical dating and ultrasound guidance are more reliable than a simple calculator estimate.
