Pregnancy Due Date Calculator
Use this calculadora embaraxo tool to estimate due date, gestational age, and trimester based on your last menstrual period.
Note: This calculator gives an estimate and does not replace medical advice. Always confirm dates with your OB-GYN or midwife.
What is a calculadora embaraxo?
A calculadora embaraxo is a pregnancy date tool that helps estimate how far along a pregnancy is and when the baby may be due. Most calculators use the first day of your last menstrual period (LMP) and apply the standard obstetric formula used in clinics worldwide.
Because ovulation and implantation can vary from person to person, this estimate is a planning guide—not an exact prediction. Even with perfect data, only a small percentage of babies are born on the exact due date.
How this calculator works
1) Due date estimate
The calculator starts with a baseline 280-day pregnancy count from LMP. It then adjusts for cycle length if your cycle is shorter or longer than 28 days.
2) Gestational age
Gestational age is counted from LMP, not from conception. That means if conception happened about two weeks later, gestational age still begins on day one of the last period.
3) Trimester assignment
- First trimester: 0 to 13 weeks + 6 days
- Second trimester: 14 to 27 weeks + 6 days
- Third trimester: 28 weeks to birth
How to use the calculator correctly
- Enter the first day of your last menstrual period.
- Use your average cycle length (28 is typical, but many people range from 24 to 35).
- Select a target date if you want to know your pregnancy week on a specific day.
- Click Calculate and review all outputs: due date, trimester, and progress.
If your periods are irregular, try using ultrasound-based dating from your provider for better precision.
When estimates may differ from medical dating
A calculator is useful, but your clinician may update the due date based on early ultrasound. This is common and not usually a reason for concern.
- Irregular cycles or unknown ovulation date
- Recent hormonal contraception use
- Breastfeeding-related cycle changes
- Differences between LMP-based and ultrasound-based fetal measurements
Healthy pregnancy planning checklist
Early pregnancy
- Schedule your first prenatal visit.
- Start or continue prenatal vitamins with folic acid.
- Discuss medications and supplements with your provider.
Second trimester
- Track blood pressure, nutrition, hydration, and activity.
- Complete recommended screening tests.
- Begin planning maternity leave and support systems.
Third trimester
- Review birth preferences and hospital/birth center logistics.
- Monitor fetal movement as advised by your clinician.
- Prepare postpartum recovery and newborn care essentials.
Frequently asked questions
Is the due date exact?
No. It is an estimate. Birth can naturally occur before or after the predicted date.
Can I use conception date instead of LMP?
If you know conception accurately (for example, fertility treatment), providers may use that information. LMP remains the most common starting method.
What if I do not remember my last period?
Use your best estimate and then confirm with a healthcare professional. Early ultrasound is often the best fallback method.
Final note
This calculadora embaraxo page is designed to help you plan appointments, understand pregnancy timing, and reduce uncertainty. For any pain, bleeding, severe symptoms, or urgent concerns, contact your healthcare provider immediately.