What This Calculator Estimates
This calculator estimates a due date using the first day of your last menstrual period and a cycle-length adjustment. It is for informational use only.
How to Use This Calculator
- Choose the first day of your last period.
- Enter your typical cycle length.
- Click Estimate Due Date.
- Review the due date and timing estimate.
- Use the result as informational guidance only.
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Frequently Asked Questions
What does this due date calculator estimate?
It estimates a due date based on the first day of your last menstrual period.
Is this a medical diagnosis?
No. It is an informational estimate only and not medical advice.
Can cycle length affect the estimate?
Yes. Different cycle lengths can change timing estimates.
Does this confirm conception date?
No. It is a planning estimate based on standard timing assumptions.
When should I verify the result?
Verify any pregnancy timing questions with a qualified clinician.
This calculator provides informational pregnancy timing estimates only and is not medical advice. Please verify medical questions with a qualified clinician.
Last updated: May 11, 2026