Due date & gestational age
From LMP — estimate only, not a substitute for ultrasound dating.
Pending a named Nera physician approval — educational content until review is recorded.
Educational only — not a diagnosis or a substitute for clinical advice. Never use to stop medication or decide treatment eligibility.
About this tool
What is it?
Estimated due date from last menstrual period (educational Naegele rule).
Who is it for?
Pregnant people with a roughly known period date.
When not to use
Do not rely on it alone with irregular cycles — ultrasound/clinician dating is better.
How to use
Enter the first day of the last period and regularity notes.
What the result means
An approximate date ± days — not a guaranteed delivery day.
When to seek help
Confirm follow-up with OB/GYN.
Sources
- NHS — Due date calculator information (2024) — Open source
FAQ
- Is this tool a diagnosis?
- No. Estimated due dates is educational preparation for a clinician discussion only.
- Are my health answers stored?
- Health inputs are not sent to ads. Only a general result band may be stored for measurement and conversion.
Related links
Health inputs are not sent to ad platforms. Only a general result band is stored for measurement and conversion.