Calculate My Due Date Baby Centre
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Reviewed by Calculator Editorial Team
Pregnancy due dates are typically calculated based on the first day of your last menstrual period (LMP). This calculator uses the standard 40-week pregnancy period to estimate your due date. Keep in mind that due dates are estimates and actual delivery dates can vary.
How to Use This Calculator
To calculate your due date:
- Enter the date of your first day of your last menstrual period (LMP)
- Click the "Calculate" button
- Review your estimated due date and pregnancy timeline
The calculator will show you your estimated due date, the number of weeks pregnant you are, and a pregnancy timeline chart.
How the Due Date Calculation Works
The standard method for calculating a due date is to add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is based on the average length of a full-term pregnancy.
Formula:
Due Date = LMP Date + 280 days
For example, if your LMP was January 1, 2023, your due date would be October 8, 2023.
Note: Due dates are estimates. Actual delivery dates can vary by several days or more.
Example Calculation
Let's say your last menstrual period started on May 15, 2023. Here's how the calculation works:
- Start with your LMP date: May 15, 2023
- Add 280 days (40 weeks) to this date
- May 15 + 280 days = February 1, 2024
Therefore, your estimated due date would be February 1, 2024.
Frequently Asked Questions
- How accurate is this due date calculator?
- The calculator provides an estimate based on standard pregnancy length. Actual delivery dates can vary.
- Can I use this calculator for a high-risk pregnancy?
- This calculator provides a general estimate. For high-risk pregnancies, consult with your healthcare provider for personalized advice.
- What if I don't know my exact LMP date?
- Use the first day of your last menstrual period as your starting point, even if it's an estimate.
- How do I know if I'm pregnant?
- Signs of pregnancy include missed periods, nausea, breast tenderness, and frequent urination. For confirmation, take a pregnancy test.