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Pregnancy Calculator
Estimated due date and gestational age from LMP (Naegele).
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Estimated due date
Gestational age (today)
This free Pregnancy Calculator covers Estimated due date and gestational age from LMP (Naegele).
Enter the Pregnancy Calculator fields, then read the output. Other calculators on this site keep the formula visible beside the form, with no account required.
Using the Pregnancy Calculator
Estimated due date and gestational age from LMP (Naegele). Typical inputs are Last menstrual period (first day). How it works beside the form states the identity the Pregnancy Calculator applies.
FAQ
How do I use the Pregnancy Calculator?
Open the Pregnancy Calculator, fill Last menstrual period (first day), and read the result. Due date ≈ LMP + 280 days; gestational age is days since LMP.
What formula does the Pregnancy Calculator use?
The Pregnancy Calculator uses the identity in How it works. In words: Due date ≈ LMP + 280 days; gestational age is days since LMP.