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Calculator: Estimated date of delivery (EDD) (Patient education)

Calculator: Estimated date of delivery (EDD) (Patient education)

Today's date   
First day of last period   

Estimated due date  
Estimated gestational age  

  • This calculator helps you estimate your date of delivery ("due date") based on the timing of your last menstrual period.
  • Gestational age estimates how far along you are in your pregnancy. Your health care provider uses the gestational age in weeks (rather than months) to plan your care during pregnancy. Most pregnancies last about 40 weeks from the first day of the last menstrual period.
  • The gestational age is based on the date of the last period, not the date of conception. Because of this, a person is usually considered at least 4 weeks pregnant by the time they actually miss a period and have a positive pregnancy test.
  • To calculate your estimated due date and gestational age, enter the current date and the date your last menstrual period started.
Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

Legal Notices and Disclaimer

All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

EBMcalc is Copyright © 1998-2023 Foundation Internet Services, LLC

Topic 13504 Version 16.0