How the Pregnancy Calculator Works
This due date calculator estimates pregnancy length based on standard medical guidelines. A typical pregnancy lasts approximately 40 weeks (280 days) from the first day of your last menstrual period (LMP).
The calculator can estimate results based on:
- Last menstrual period (LMP)
- Conception date
- Ultrasound date
- IVF transfer date
Pregnancy Calculation Formula
Estimated Due Date = First Day of LMP + 280 Days
Alternatively:
- Conception Date + 266 Days
- IVF Transfer Date + 261-266 Days (depending on embryo age)
Pregnancy Trimesters Explained
First Trimester (Weeks 1-13)
Major organs begin forming. Early symptoms like nausea and fatigue are common.
Second Trimester (Weeks 14-27)
Baby growth accelerates. Many women feel increased energy during this stage.
Third Trimester (Weeks 28-40)
Rapid fetal weight gain occurs. The body prepares for labor and delivery.
Weekly Pregnancy Milestones
- Week 4-5: Pregnancy test positive
- Week 6-7: Heartbeat detectable
- Week 12: Miscarriage risk decreases
- Week 20: Anatomy scan ultrasound
- Week 24: Baby may survive outside womb (with medical support)
- Week 37-40: Full term pregnancy
Why Use a Pregnancy Due Date Calculator?
- Track pregnancy progress accurately
- Prepare for doctor visits
- Plan maternity leave
- Monitor trimester transitions
- Understand fetal development milestones
Pregnancy Planning & Health Tips
Nutrition
Proper prenatal nutrition is essential. Folic acid, iron, calcium, and DHA are important nutrients during pregnancy.
Exercise
Moderate exercise supports healthy pregnancy unless advised otherwise by your doctor.
Medical Checkups
Regular prenatal visits help monitor baby development and maternal health.
Limitations of This Pregnancy Calculator
- Provides estimates, not exact delivery dates
- Does not replace professional medical advice
- Individual pregnancy lengths may vary
- Ultrasound dating may override LMP estimates
Start Tracking Your Pregnancy Today
Use the Pregnancy Calculator on Mega Calculator to estimate your due date, monitor weekly progress, and understand key milestones throughout your pregnancy journey.