HIGH-DEMAND HEALTH ESTIMATES WITH LIMITS
Estimate gestational weeks, days, and an expected due date from the first day of the last menstrual period and a reference date.
Your result
Enter your values and choose Calculate. Your inputs stay on this device.
Gestational age = calendar days since LMP; expected due date = LMP + 280 days.
Initial dating convention assumes a reliable LMP and typical cycle. Ultrasound and clinical assessment may revise the estimated gestational age.
This calculator provides an initial LMP-based calendar estimate and does not confirm pregnancy or replace clinical dating.
Estimate gestational age from LMP and a reference date with clear dating and care limitations.
Build a reliable scenario
Pregnancy Week Calculator India helps you check a specific health & family question with figures that apply to you. Estimate gestational weeks, days, and an expected due date from the first day of the last menstrual period and a reference date. Estimate gestational age from LMP and a reference date with clear dating and care limitations. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.
Prepare First day of last menstrual period and Reference date. Review the formula and assumptions shown for this pregnancy week calculator india. Enter the first day of the last menstrual period and the date for which you need the estimate. Calculate and review completed weeks, days, and the estimated due date. Contact a qualified professional for dating, symptoms, tests, pain, bleeding, or any concern. Keep units, dates, currency, and time periods consistent.
The stated method is: Gestational age = calendar days since LMP; expected due date = LMP + 280 days. Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.
Initial dating convention assumes a reliable LMP and typical cycle. Ultrasound and clinical assessment may revise the estimated gestational age. Educational estimate only. It is not a diagnosis, prescription, fertility method, pregnancy confirmation, or substitute for a qualified health professional.
Source and update
Last reviewed: 2026-08-22
ACOG — Methods for Estimating the Due DateThis calculator provides an initial LMP-based calendar estimate and does not confirm pregnancy or replace clinical dating.
Review completed weeks, days, and the estimated due date. The result changes whenever an input or assumption changes.
Contact a qualified professional for dating, symptoms, tests, pain, bleeding, or any concern.
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