Reverse Due Date Calculator

Free calculate reverse due date. This is an educational tool only - always consult a healthcare provider.

Pregnancy Information

Results

Enter information to calculate LMP date

About Reverse Dating

  • • LMP = Due Date - 280 days
  • • LMP = Today - (Gestational Age × 7)
  • • Used when due date is known
  • • Helps verify pregnancy dating
  • • Ultrasound may adjust dates