Gestational Age Calculator

Select either LMP or Ultrasound as the basis for calculating EDD.

If using LMP, enter the relevant date, then click ‘Calculate EDD’.

If using ultrasound, enter the date of the scan. Then in the ‘Scan data’ section, enter either gestational age or fetal biometry. If fetal biometry is selected, enter measurements as known. Then click ‘Calculate EDD’.

To further calculate length of gestation at delivery, select ‘Yes’ and enter the date of birth. Then click ‘Calculate gestation’.

If you are having problems, click here for a troubleshooting guide