Pregnancy calculator?

Dr.Anjali Pathak
05 August 2025

1. Based on Last Menstrual Period (LMP)

• Most common method used by health professionals.
• Add 280 days (or 40 weeks) to the first day of your last period.
  • Alternatively: first day of LMP + 7 days → subtract 3 months → add 1 year (known as Naegele’s rule) American Pregnancy Association+15Wikipedia+15Flo+15CDC+5CDC+5CDC+5

• If you tracked ovulation or know the conception date (e.g. IVF), use that:
  • Add 266 days (approximately 38 weeks) to estimate your due date Flo+1Parents+4Perinatology+4Healthify+4

• The most accurate method if your cycle is irregular or LMP is uncertain.
• Doctors compare ultrasound gestational age to LMP and may update the EDD if the difference exceeds certain thresholds (e.g. 5–7 days within early weeks) Perinatology

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Aanya
06 August 2025

A pregnancy calculator helps you estimate your expected delivery date (EDD) and track your pregnancy progress. Simply enter the first day of your last menstrual period and your average cycle length into the government’s online tool. It then estimates how far along you are—usually a 40‑week period—and helps plan your prenatal appointments.

This service is provided by the Department of Health & Family Welfare, Government of India, via their official site:
https://www.india.gov.in/online-pregnancy-calculator

This tool is especially helpful for first-time mothers to organize care and feel more confident about what’s ahead.

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