Estimate a pregnancy due date from the last menstrual period, conception, or IVF transfer date.
Change the inputs that matter to your decision. Optional assumptions stay collapsed until you need them.
Choose the pregnancy date you know most confidently.
Compare another dating method when you know more than one anchor.
Select the date for the chosen dating method.
Practical notes about the inputs, assumptions, and result.
The standard model uses 280 days from the first day of the last menstrual period, with a cycle-length adjustment when a cycle is consistently different from 28 days.
Yes. Your clinician may use ultrasound and other information to confirm or revise pregnancy dating.
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