Pregnancy Due Date Calculator
Estimate a pregnancy due date from last period date and cycle length.
Estimated due date
2026-10-08
Estimated conception window start
2026-01-13
Estimated conception window end
2026-01-17
Formula
Estimated due date = last period date + 280 days + cycle length adjustment.
Assumptions
- Uses last menstrual period plus cycle-length adjustment.
- Clinical dating can differ based on ultrasound, medical history, and clinician assessment.
The due date calculator gives a basic estimate from the first day of the last menstrual period and cycle length. It is informational and not medical advice.
How to Use
The due date calculator gives a basic estimate from the first day of the last menstrual period and cycle length. It is informational and not medical advice.
- Open the calculator : Start with Pregnancy Due Date Calculator.
- Enter values : Fill in the required inputs and any optional settings.
- Review the result : Read the output and use the about page for more detail if needed.
Common Questions
What does the Pregnancy Due Date Calculator estimate?
It estimates a due date from your chosen pregnancy timing input.
How accurate is the result?
This is an informational estimate based on a typical pregnancy timeline, not a medical diagnosis or guarantee.