Due Date Calculator
Estimate your due date, conception window, and gestational age.
Estimated due date:
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Gestational age:
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Conception window:
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Enter your LMP to estimate key dates. This is informational only.
Due Date Calculator
What this calculator helps you do
Use the due date calculator to estimate a pregnancy due date from the last menstrual period, conception date, or other timing inputs. It is useful for planning milestones and understanding the general pregnancy timeline.
How due dates are estimated
Most due dates are estimated by counting about 280 days from the first day of the last menstrual period. This works best for regular cycles, but it is still only an estimate.
What can shift the date
- Irregular cycle length
- Uncertain ovulation timing
- Ultrasound dating that differs from cycle-based estimates
How to use the result
Use the estimate for planning, then compare it with guidance from your healthcare provider. Medical dating can be more accurate than calendar estimation alone.
Bottom line
This tool gives a practical estimate, but your clinician should guide any medical decisions related to pregnancy timing.