Estimated Date of Delivery (EDD) Pregnancy Calculator

Current Date   
Last Menstrual Period   
Ultrasound Date   
Gestational Age by US
Current Gestational Age by LMP
Current Gestational Age by US
  • This calculator gives you two options for estimating EDD (estimated date of delivery.)
  • Input any parameters to compare the two date calculations. The Current Date is set to your local workstation date.
  • Gestational Age by LMP is calculated from the first day of the last menstrual period.
  • EDD by LMP is calculated by adding 280 days (40 weeks) to the first day of the last menstrual period.
  • Gestational Age by US is measured by ultrasound (US) on the Ultrasound Date.
  • EDD by US is the estimated date of delivery based on the Gestational Age by US and the Ultrasound Date.
  1. Mul T, Mongelli M, Gardosi J. A comparative analysis of second-trimester ultrasound dating formulae in pregnancies conceived with artificial reproductive techniques. Ultrasound Obstet Gynecol. 1996 Dec;8(6):397-402.
  2. Westerway SC, Davison A, Cowell S. Ultrasonic fetal measurements: new Australian standards for the new millennium. Aust N Z J Obstet Gynaecol. 2000 Aug;40(3):297-302.
  3. Altman DG, Chitty LS. New charts for ultrasound dating of pregnancy. Ultrasound Obstet Gynecol. 1997 Sep;10(3):174-91.
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