Pregnancy Calculator
Track your pregnancy progress, trimester, and upcoming milestones from your LMP or due date.
Milestones
| Week | Milestone | Date |
|---|---|---|
| Week 8 | Heartbeat detectable | -- |
| Week 12 | End of first trimester | -- |
| Week 20 | Anatomy scan | -- |
| Week 27 | Start of third trimester | -- |
| Week 40 | Estimated due date | -- |
What is Pregnancy Calculator?
A Pregnancy Calculator helps expectant parents track the progress of a pregnancy by estimating gestational age, trimester, and key developmental milestones. It can work from either the first day of the last menstrual period (LMP) or a known due date provided by a healthcare provider.
Understanding your pregnancy timeline helps you prepare for prenatal appointments, anticipate developmental changes, and plan for the arrival of your baby. The milestones table offers a quick reference for important stages along the journey.
How to Use
- Choose whether to calculate from your Last Menstrual Period or a known Due Date.
- Enter the appropriate date in the date picker.
- Click Calculate to see gestational age, trimester, days remaining, and estimated conception date.
- Review the milestones table for key dates during your pregnancy.
Frequently Asked Questions
How is gestational age calculated?
Gestational age is typically measured from the first day of your last menstrual period, even though conception usually occurs about two weeks later.
What if my cycle is irregular?
An irregular cycle can affect accuracy. Early ultrasound dating is the most reliable method when cycle length varies significantly from 28 days.
When does each trimester start and end?
The first trimester runs through week 12, the second from week 13 to 27, and the third from week 28 until delivery.
Is the due date guaranteed?
Only about 5% of babies are born exactly on their due date. A normal pregnancy can range from about 37 to 42 weeks.