Gestation Calculator

Calculate from

If an early ultrasound revised the dates, enter the revised due date.

Defaults to today. Change it to work out gestation on another date.

Enter a date to see gestation.

Dating by menstrual history is an estimate. Where an early ultrasound has revised the due date, enter the revised date.

This is a dating aid, not a clinical record. Confirm gestation against the woman's own record before acting on it.

Gestation calculator

Gestation calculator

Enter an estimated due date or a last menstrual period.

Calculate from

If an early ultrasound revised the dates, enter the revised due date.

Defaults to today. Change it to work out gestation on another date.

Enter a date to see gestation.

Dating by menstrual history is an estimate. Where an early ultrasound has revised the due date, enter the revised date.

This is a dating aid, not a clinical record. Confirm gestation against the woman's own record before acting on it.