Calculator template

Baby Due Date Calculator

Estimate your baby’s due date from your last menstrual period or your conception date.

Enter values
Your result will appear here.

FAQ

  • How accurate is this? It is a planning estimate. A clinician may revise the due date using early ultrasound.
  • Why does cycle length matter? The standard formula assumes a 28-day cycle, so longer or shorter cycles can shift the estimate.
  • Can I use conception date instead? Yes. The calculator includes a conception-date mode.