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Pregnancy Due Date Calculator

This pregnancy due date calculator will calculate your due date and show you important information for your pregnancy week by week.

Pregnancy Due Date Calculator

Select Event:
 Date:
Ultrasound:
 weeks    days        
Cycle Length (days):
Transfer Day:

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BabyMed Pregnancy Fertility Calculator

 

Make sure you know whether your menstrual cycles are regular or not HERE.

Due Date Calculator

This estimate is based on the last menstrual period and the estimated date of conception. Your pregnancy due date calculator works by adding 40 weeks (280 days) to the approximate first day of your last menstrual period or 266 days to the day of ovulation.

Try our Reverse Due Date Calculator to find out when you became pregnant. There, you can enter your due date and we will calculate the exact days of conception. More importantly, we will provide the range of dates that you may have made love and got pregnant.

Please also look at the Interactive Pregnancy Wheel.

How To Use the Pregnancy Due Date Calculator

The first step is to know the first day of your last menstrual period and the length of your menstrual cycle. Enter the date of the first day of the last menstrual period and the cycle length. Alternatively, you can also enter the day of ovulation, the weeks and days of the pregnancy on ultrasound, or the IVF egg or embryo transfer date.

The pregnancy due date calculator wil then calculate the exact date the baby will be due as well as other important events such as the date of implantation, when the baby will start moving and dates for important tests like amniocentesis, ultrasound, or glucose screen.

In addition to the Pregnancy Due Date Calculator, there is also a unique and handy offline tool called the Ovulation Calendar & 9-Month Pregnancy Wheel that helps determine a woman's ovulation date and serves as a traditional pregnancy wheel after conception has occurred.

 

 

REFERENCES

 

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Kramer MS, McLean FH, Boyd ME, Usher RH: The validity of gestational age estimation by menstrual dating in term, preterm and postterm gestations. JAMA 1988; 260:3306. PMID:3054193 

Savitz DA, Terry JW Jr, Dole N, Thorp JM Jr, Siega-Riz AM, Herring AH.Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. Am J Obstet Gynecol. 2002 Dec;187(6):1660-6. PMID:12501080

Chervenak FA, Skupski DW, Romero R, et al: How accurate is fetal biometry in the assessment of fetal age?. Am J Obstet Gynecol 1998; 178:678.PMID:9579429 

Mongelli M, Wilcox M, Gardosi J.: Estimating the date of confinement: ultrasonographic biometery versus certain menstrual dates. Am J Obstet Gynecol 1996; 174:278.PMID:8572021 

Savitz DA, Terry Jr JW, Dole N, et al: Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. Am J Obstet Gynecol 2002; 187:1660.PMID:12501080

Wilcox M, Gardosi J, Mongelli M, et al. Birth weight from pregnancies dated by ultrasonography in a multicultural British population. BMJ. Sep 4 1993;307(6904):588-91.PMID:8401014 

Ultrasonography in Pregnancy. ACOG Practice Bulletin No. 98. American College of Obstetricians and Gynecologists. Obstet Gynecol 2008;112: 1419–44. 

Rossavik IK, Fishburne JI. Conceptional age, menstrual age, and ultrasound age: a second-trimester comparison of pregnancies of known conception date with pregnancies dated from the last menstrual period. Obstet Gynecol. 1989 Feb;73(2):243-9.PMID: 2643067

Henderson SO, Mallon WK.Trauma in pregnancy. Emerg Med Clin North Am. 1998 Feb;16(1):209-28.PMID: 9496322

 

ACOG practice bulletin. Antepartum fetal surveillance. Number 9, October 1999 (replaces Technical Bulletin Number 188, January 1994). Clinical management guidelines for obstetrician-gynecologists. Int J Gynaecol Obstet. 2000 Feb;68(2):175-85. PMID: 10717828

Institute for Clinical systems Improvement. Routine Prenatal Care. 13th ed. August 2009. Available at: http://www.icsi.org/prenatal_care_4/prenatal_care__routine__full_version...

 

Hay DL, Lopata A.Chorionic gonadotropin secretion by human embryos in vitro. J Clin Endocrinol Metab. 1988 Dec;67(6):1322-4.PMID: 2461389

Wilcox AJ, et al. Time of implantation of the conceptus and loss of pregnancy.N Engl J Med. 1999 Jun 10;340(23):1796-9.PMID: 10362823

Lohstroh P, et al. Daily immunoactive and bioactive human chorionic gonadotropin profiles in periimplantation urine samples. Biol Reprod. 2006 Jul;75(1):24-33. PMID: 16525035

Cervical insufficiency. ACOG Practice Bulletin No. 48. The American College of Obstetricians and Gynecologists. Obstet Gynecol 2003;102:1091–9. PMID: 15124633

Berghella V, et al., Does transvaginal sonographic measurement of cervical length before 14 weeks predict preterm delivery in high-risk pregnancies? Ultrasound Obstet Gynecol 2003;21:140-144. PMID: 12601834

Ultrasonography in Pregnancy. ACOG Practice Bulletin No. 101. American College of Obstetricians and Gynecologists. Obstet Gynecol 2009;113: 451–61. PMID: 19155920 

ACOG practice bulletin. Prevention of Rh D alloimmunization. Number 4, May 1999 (replaces educational bulletin Number 147, October 1990). Clinical management guidelines for obstetrician-gynecologists. American College of Obstetrics and Gynecology. Int J Gynaecol Obstet. 1999 Jul;66(1):63-70. PMID: 10458556

Fetal Lung Maturity. ACOG Practice Bulletin No. 97. American College of Obstetricians and Gynecologists. Obstet Gynecol 2008;112: 717–26PMID: 18757686

Altman DG, Chitty LS. New charts for ultrasound dating of pregnancy. Ultrasound Obstet Gynecol. 1997 Sep;10(3):174-91.

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.

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.

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