Due Date
Estimated due date from LMP or conception.
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Pregnancy dating is an estimate. Ultrasound and clinical judgment override a calendar wheel. This page does not diagnose pregnancy.
How to use this tool
- Enter your measurements. Use the units shown on the labels. Do not send medical data anywhere.
- Read the estimate. These formulas are public rules of thumb, not a diagnosis.
- Talk to a clinician for decisions. Do not change medicine, diet, or training from this page alone.
Method
LMP mode adds 280 days from the first day of the last period. Conception mode adds 266 days. Cycle length can be adjusted. Midwives and physicians may date differently.
Frequently asked
Why does my clinic show a different date?
They may have used ultrasound or a different cycle assumption. Follow clinical care.
Can I enter IVF transfer?
A transfer-date mode adds the usual offset for day-3 or day-5 transfers. Confirm with the clinic.
Does this confirm I am pregnant?
No.
Does a calendar due date replace prenatal care?
No. Naegele-style math is an estimate, not medical advice.
Are trimesters listed?
Yes, as conventional week ranges, not as a care plan.