Pregnancy Calculator
Track pregnancy milestones and calculate your due date
Estimated Due Date:
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Current Week of Pregnancy:
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Trimester:
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About Pregnancy Calculation
Pregnancy is typically calculated from the first day of your last menstrual period (LMP), which is about two weeks before conception actually occurs. A full-term pregnancy is approximately 40 weeks from the LMP.
How to Use Pregnancy Calculator
- Enter the last period date
- Enter your average cycle days length
- Click the calculate button
- View your results in the result section
Why We Use Pregnancy Calculator
- To Establish the Estimated Due Date (EDD)
- To Track Fetal Development and Growth
- To Schedule Critical Prenatal Tests and Screenings
- For Improved Prenatal Care and Planning
Pregnancy Trimesters
- First trimester: Weeks 1-13 - Early development, organ formation
- Second trimester: Weeks 14-27 - Growth, movement felt
- Third trimester: Weeks 28-40+ - Rapid growth, preparation for birth
Key Pregnancy Milestones
| Week | Development Milestone |
|---|---|
| 4 | Neural tube begins forming |
| 8 | All essential organs beginning to form |
| 12 | Risk of miscarriage decreases significantly |
| 16 | Can possibly determine sex |
| 20 | Anatomy scan typically performed |
| 24 | Viable outside womb with medical intervention |
| 28 | Third trimester begins |
| 37 | Considered full-term |
Only about 5% of babies are born on their exact due date. Most are born within two weeks before or after.