Estimate gestational age and due dates from LMP, clinical reference dating or embryo transfer, with a trimester timeline.
01 / PURPOSE-SPECIFIC INPUTS
Dating estimates do not confirm pregnancy or replace the established clinical due date. Ultrasound mode accepts reported age, not raw scan measurements.
02 / RESULT & INTERACTIVE INSPECTION
Calendar gestational age at the selected reference date, if the pregnancy is ongoing; this does not establish pregnancy status. Prefilled dates are examples, not personal medical history. Confirm dating with a healthcare professional.
Inspected position: 13w 0d. This is an illustrative timeline position, not a newly determined medical date.
Enter your values locally; no inputs are uploaded.
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Review the explanation, copy supported outputs or reset the workspace.
Choose a dating method and its reference date. Select the date on which to calculate gestational age. Inspect the timeline and compare methods without averaging them. Read the worked explanation and scope alongside every result.
Estimate gestational age and due dates from LMP, clinical reference dating or embryo transfer, with a trimester timeline. Interactive controls inspect the calculated model without silently changing submitted assumptions.
Pregnancy Calculator inputs and calculations remain in browser memory. No external processing API receives entered dates, measurements, coefficients or financial values. Ordinary website page requests may still be logged. Clipboard access occurs only when you choose Copy Result.
Use LMP with cycle adjustment, an estimated due date, clinician-reported gestational age on a scan/reference date, or a day-3, day-5 or day-6 embryo transfer. Raw ultrasound measurements are not interpreted.
The model due date is LMP plus 280 days plus cycle length minus 28 days. Gestational dating begins 280 days before the derived due date; cycle adjustment is approximate.
Estimated due date is transfer date plus 266 minus embryo age in days. A day-5 transfer adds 261 days. The clinic’s established ART dating should guide care.
First trimester runs through 13 weeks 6 days, second from 14 weeks through 27 weeks 6 days, and third from 28 weeks. The 37-week and due-date markers are educational dating references, not diagnoses.
No. The optional comparison reports the entered methods and date difference independently. Clinical dating can supersede an LMP estimate; the calculator does not choose or average conflicting clinical dates.
No. Progress is calendar arithmetic conditional on an ongoing pregnancy. Dates before the modeled start or beyond 42 weeks receive no current progress assignment, and the tool cannot determine delivery or pregnancy status.