Pregnancy Due Date Estimator
Calculate your baby’s due date using one of several medically recognized methods.
How is the Due Date Calculated?
The standard pregnancy lasts about 280 days (40 weeks) from the first day of your last menstrual period. However, depending on the method, the calculation might shift slightly.
- LMP: Adds 280 days from the start of your last period.
- Conception: Adds 266 days from conception date.
- Ultrasound: Your OB/GYN uses fetal growth measurements to estimate.
- IVF: Specific IVF transfer dates determine exact fetal age.
Why Estimating Your Due Date Matters
Knowing your due date helps in:
- Tracking trimester development
- Scheduling prenatal appointments and screenings
- Preparing emotionally and physically
- Ensuring timely medical intervention if needed
How Accurate Is the Due Date?
It’s an estimate. Only 5% of babies are born on their actual due date. Most births occur within a week before or after. Ultrasound dating is considered most reliable in the first trimester.
Trimester Breakdown
- First Trimester: Week 1 – 13
- Second Trimester: Week 14 – 27
- Third Trimester: Week 28 – Birth
FAQs – Pregnancy Due Date Calculator
Can I calculate my due date without knowing LMP?
Yes, you can use conception, ultrasound, or IVF dates instead.
Does irregular periods affect due date accuracy?
Yes, if your cycles are irregular, ultrasound is preferred for accurate dating.
Is it normal to go past my due date?
Yes. Full-term pregnancy ranges from 37 to 42 weeks.