CalculateHealth
Pregnancy Due Date Calculator
Estimate your due date and track your pregnancy timeline. Dates are estimates only—every pregnancy is unique.
🔒 Your data is private and not stored.
Estimated due date
February 12, 2026
✓ You are approximately 12 weeks pregnantBased on your last menstrual period of May 8, 2025. Your pregnancy is progressing as expected.
Your pregnancy timeline
A quick overview of each stage.
First trimester
Weeks 1–13Early development and foundations for growth.
Second trimester
Weeks 14–26Growth, movement, and exciting changes.
Third trimester
Weeks 27–40Final preparations for birth.
Estimated due date
February 12, 2026Week 40
Understand your estimate
Due dates are estimates—most babies arrive before or after.
Only about 5%
of babies are born on their estimated due date.
Normal range
Most babies arrive between 37 and 42 weeks.
Many factors
Babies arrive at different times for many healthy reasons.
Focus on wellness
Regular care and a healthy lifestyle support you and your baby.
Learn more
1. How the date is estimated
We use the Naegele rule: add 280 days to the first day of your last menstrual period.
2. Key terms explained
LMP · Conception · Due date · Gestational age
3. How to use this calculator
Choose your dating method, enter dates and cycle length, then review your result.
4. The 40-week calculation
Pregnancy is counted from LMP, not conception—about 2 weeks before fertilization.
5. Worked example
LMP: May 8, 2025 + 280 days = February 12, 2026.
6. Cycle length adjustments
Longer cycles may mean later ovulation; shorter cycles may mean earlier.
7. When ultrasound dating differs
Early ultrasound may give a more accurate due date.
8. Frequently asked questions
How accurate is this calculator? What if my periods are irregular?
Reviewed byThis content is reviewed for accuracy.
Last reviewed: May 8, 2025
Trusted medical sourcesWorld Health Organization · ACOG
Important noteFor informational purposes only and does not replace professional advice.
Your privacy mattersYour information stays private and secure.
♢ Medical disclaimer: This calculator provides an estimated due date and is not intended to diagnose or treat any condition. Always consult your healthcare professional.