Baby's Due Date Calculator
'/%3E%3Ccircle cx='48' cy='39' r='19' fill='%23f2c9a5'/%3E%3Cpath d='M27 35c3-16 39-17 42 2-8-8-27-9-42-2z' fill='%23374151'/%3E%3Cpath d='M21 86c5-24 49-28 56 0z' fill='%232563eb'/%3E%3Ccircle cx='41' cy='41' r='2' fill='%23111827'/%3E%3Ccircle cx='55' cy='41' r='2' fill='%23111827'/%3E%3Cpath d='M42 52c4 3 9 3 13 0' stroke='%2392400e' stroke-width='3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E)
Reviewed by Calculator Editorial Team
Pregnancy is a special time, and knowing your baby's due date helps you plan for the arrival. Our baby's due date calculator helps you estimate your due date based on your last menstrual period (LMP) or ultrasound date. This tool provides a general timeline, but remember that every pregnancy is unique.
How to Use This Calculator
To calculate your baby's due date, you'll need either:
- Your last menstrual period (LMP) date, or
- Your ultrasound date and the estimated gestational age at that time
Enter the relevant information in the calculator on the right, then click "Calculate" to see your estimated due date. The calculator will also show you the expected date range and the current week of pregnancy.
Note: This calculator provides an estimate. For the most accurate information, consult your healthcare provider.
Formula Used
The standard pregnancy duration is 40 weeks (280 days). The due date is calculated by adding 280 days to your last menstrual period (LMP) date.
If you have an ultrasound date and know your gestational age at that time, the formula is:
For example, if you had an ultrasound at 12 weeks, the due date would be 12 weeks after the ultrasound date.
Example Calculation
Let's say your last menstrual period was on January 1, 2023. Using the calculator:
Example Input
LMP Date: January 1, 2023
Calculation: January 1 + 280 days = November 10, 2023
Result: Your baby's due date would be November 10, 2023, with an expected date range of October 27 to November 23, 2023.
This example shows that the due date is typically calculated as 40 weeks (280 days) after the first day of your last menstrual period.
Frequently Asked Questions
How accurate is the due date calculator?
The calculator provides an estimate based on standard pregnancy duration. Individual pregnancies may vary, so it's always best to consult your healthcare provider for the most accurate information.
Can I use this calculator if I had an ultrasound?
Yes, you can enter your ultrasound date and gestational age to get a more precise estimate of your due date.
What if my pregnancy is early or late?
The calculator uses standard averages. Early or late pregnancies may require medical attention, so always consult your healthcare provider if you have concerns.