Step-by-step instructions
- Enter or select First day of last menstrual period.
- Tap Calculate.
- Review the result shown directly below the calculator.
Pregnancy Due Date Calculator
Estimate due date from the first day of the last menstrual period.
How to use the Pregnancy Due Date Calculator
Estimate due date from the first day of the last menstrual period.
What the inputs mean
- First day of last menstrual period
- Choose the calendar date requested by this field.
Formula or calculation method
The calculator applies the standard mathematical relationship for the labeled inputs and returns the computed result automatically.
Example
Enter a realistic value for First day of last menstrual period and tap Calculate to see the computed result.
How to understand the result
Use the result as an estimate based on the values you entered. For planning decisions, double-check that the input units and assumptions match your real situation.
Tip: Keep all values in compatible units and use values from the same time period when the calculator compares two amounts.