This pregnancy due date calculator estimates an expected due date using the first day of your last menstrual period, which is the most common starting point for basic due date estimation.
When this calculator is useful
When to use the pregnancy due date calculator
See when to use the pregnancy due date calculator and which inputs to compare for your situation.
Try it in situations like these
Enter First day of last period to calculate the result for your current situation.
Change First day of last period while keeping the other inputs the same to see how much the result changes.
Before acting on the result, check the units and any real-world conditions the calculator does not include.
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Understand the calculation
See how the result is calculated.
Read the guide
See the step-by-step instructions.