Pregnancy Due Date Calculator
Accurate calculators with instant results.
What does this tool do?
Find your due date, weeks pregnant and trimester from LMP.
Key features
- Instant calculation
- Accurate formulas
- Clear result breakdown
- Mobile-friendly inputs
Pregnancy Due Date Calculator
Find your due date, weeks pregnant and trimester from LMP.
What does this tool do?
Find your due date, weeks pregnant and trimester from LMP. This free online tool works instantly in your browser — no signup, no download, no watermark.
Key Features
- Due date from last period
- Current week of pregnancy
- Trimester indicator
- Naegele's rule (280 days)
Based on Naegele's rule: due date is 280 days (40 weeks) after the first day of the last period, assuming a 28-day cycle.
Frequently Asked Questions
How is the due date calculated?
Using Naegele's rule: 280 days (40 weeks) are added to the first day of the last menstrual period.
How accurate is the estimated due date?
Only about 5% of babies arrive exactly on the due date. Most arrive within two weeks before or after. An ultrasound gives a more precise estimate.
What if my cycle is not 28 days?
This calculator assumes a 28-day cycle. With irregular cycles, a dating ultrasound is more reliable.
Is this medical advice?
No. It is an estimate for information only. Always follow your doctor's guidance during pregnancy.
How to Use Pregnancy Due Date Calculator
Reviews & Comments
No reviews yet. Be the first to share your experience!
Your feedback helps others discover great tools.