Pregnant Baby Delivery Calculator
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Reviewed by Calculator Editorial Team
Use this calculator to determine your estimated due date based on your last menstrual period or ultrasound date. Pregnancy lasts approximately 40 weeks from the first day of your last menstrual period.
How to Use This Calculator
To calculate your estimated due date:
- Select whether you want to calculate based on your last menstrual period or ultrasound date.
- Enter the relevant date in the provided field.
- Click "Calculate" to see your estimated due date.
The calculator will display your estimated due date, current pregnancy week, and days until delivery.
How the Calculator Works
The calculator uses standard pregnancy calculations:
Based on last menstrual period:
Due Date = Last Period Date + 280 days (40 weeks)
Based on ultrasound date:
Due Date = Ultrasound Date + (280 days - (gestation weeks × 7 days))
These calculations are based on the average length of pregnancy, which is 40 weeks (280 days) from the first day of your last menstrual period.
Example Calculation
If your last menstrual period was on January 1, 2023:
- Due Date = January 1, 2023 + 280 days = October 28, 2023
- Current pregnancy week = (Today's date - January 1, 2023) / 7 days
- Days until delivery = October 28, 2023 - Today's date
For an ultrasound date of March 15, 2023 with 12 weeks of gestation:
- Due Date = March 15, 2023 + (280 - 84) days = October 28, 2023
Important Notes
This calculator provides an estimate. Actual delivery dates may vary.
Consult with your healthcare provider for personalized medical advice.
Pregnancy lengths can vary. Some pregnancies last slightly longer or shorter than 40 weeks.
Ultrasound dates are more accurate than last menstrual period dates for determining due dates.
Frequently Asked Questions
How accurate is the pregnancy due date calculator?
The calculator provides an estimate based on standard pregnancy lengths. For more precise information, consult your healthcare provider.
Can I use this calculator for multiple pregnancies?
Yes, you can use the calculator for each pregnancy separately by entering the appropriate dates.
What if my pregnancy is high-risk?
This calculator provides general estimates. High-risk pregnancies may require different calculations and medical supervision.
How often should I update my due date?
It's recommended to update your due date based on your healthcare provider's advice, especially after each prenatal visit.