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Pregnancy Due Date Calculator — Naegele’s Rule
Calculate your estimated baby due date, current trimester, and conception date.
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BIOMETRIC HEALTH
More in Fitness & Health:
Last Menstrual Period Date
Naegele’s Rule for Due Date
Transparent mathematical methodology explained in plain English.
Estimated Due Date = LMP + 280 Days (40 Weeks) Calculates the estimated date of delivery based on an average 28-day menstrual cycle.
Variables Explained:
- LMP: First day of your last menstrual period.
- 280 Days: Standard clinical gestation period (40 weeks).
Real Project Example
LMP on January 15
Estimating due date.
Sample Project Inputs:
LMP Date: January 15
Step-by-Step Calculation:
- Add 1 year, subtract 3 months, add 7 days: January 15 + 1 year = next Jan 15; minus 3 months = Oct 15; plus 7 days = Oct 22.
- Estimated Due Date: October 22.
- Estimated Conception: approx. January 29.
Calculated Answer: Estimated Due Date: October 22.
Knowledge Base
Frequently Asked Questions: Pregnancy Due Date
Click any question below to expand quick answers, formulas, and expert tips.
How accurate is a due date calculator?
Only about 4% to 5% of babies are born on their exact predicted due date. Most deliveries occur safely within a two-week window before or after the 40-week date.