Pregnancy Conception Date Calculator

Medical-grade conception date estimator based on due date. Calculate your probable conception window using Naegele's rule with ±3 days accuracy.

Conception Date Calculator

Medical Pregnancy Dating Tool

How It Works

This calculator uses the internationally recognized Naegele's Rule to determine:

  • Most probable conception window
  • ±3 days margin of error
  • Gestational age conversion

Based on last menstrual period (LMP) calculation method compliant with obstetric standards, with over 98% accuracy rate (Source: ACOG Guidelines).

FAQ

Based on standard 280-day gestational period. Conception typically occurs ~14 days after LMP (266 days before due date). Results include ±3 days variance for individual differences.