Using the calculator
Enter First day of last menstrual period, Average cycle length, Calculate gestational age on. Estimate due date, gestational age and trimester milestone dates from the first day of the last menstrual period and cycle length.
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Pregnancy Due Date Calculator
Estimate due date, gestational age and trimester milestone dates from the first day of the last menstrual period and cycle length.
Enter your measurements and health details
Use current, consistently measured values for the pregnancy due date calculation. Results update automatically and are intended for education and planning, not diagnosis.
days
Estimated due date—
Estimated gestational age—
Second trimester begins—
Third trimester begins—
Important: Health results are educational screening and planning estimates. They are not a diagnosis and are not a substitute for medical care.
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How to use this calculator
Reading the result
The result shows due date, gestational age and trimester milestone dates from the first day of the last menstrual period and cycle length.
Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.