✦ EVIDENCE-INFORMED PREGNANCY DATING

Advanced Due Date Calculator

Estimate pregnancy dates from LMP, ultrasound report, IVF embryo transfer or an existing clinician-established date. Optionally save estimates after signing in.

Choose a dating method

Select one method and choose dates using your calendar.

First day of last menstrual period Usual menstrual cycle length (days)

My periods are usually regular

Date of ultrasound scan

Gestational age on report (weeks)

Additional days (0–6)

CRL from report (mm) — optional

CRL is recorded only to provide context. The calculator does not convert CRL to GA.

Date of embryo transfer Embryo age at transfer

Due date established by clinician

Original LMP if known — optional

Stored only as a reported LMP. It will not override ultrasound, IVF or clinician-established EDD.

Compares two date estimates for discussion with your clinician. No automatic re-dating occurs.

First day of last menstrual period

Usual menstrual cycle length (days)

My periods are usually regular

Date of ultrasound scan

Gestational age on report (weeks)

Additional days (0–6)

Start again

🔒 Guests can calculate without saving. Signed-in users may explicitly save the estimated date and method in private MySQL history. Original LMP is also saved when supplied; ultrasound and IVF procedural details are not stored.

Your calculated result

Estimate pregnancy dates from LMP, ultrasound report, IVF embryo transfer or an existing clinician-established date. Optionally save estimates after signing in.

Advanced Due Date Calculator

Your calculated result

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