Calculator Choice

How This Due Date Calculator Works

This tool estimates your baby's due date using your LMP and the average length of your menstrual cycle. It assumes ovulation occurs 14 days before your next period.

Formula:

Due Date = LMP + 280 days (40 weeks)
Adjusted by: (Cycle Length - 28 days)

Disclaimer:

This calculator provides an estimate. For a more accurate due date, consult your healthcare provider or get an ultrasound.