Pregnancy Due Date Calculator
Estimated due date, current week of pregnancy and trimester from your last period.
Gestational Age from Due Date
Gestational age on any date from a known estimated due date (e.g. from an ultrasound).
Your result will appear here
Enter your measurements, then press Calculate.
Methodology
ACOG CO 700 dating convention
GA (days) = 280 − (EDD − date)
The due date corresponds to 40 weeks 0 days.
- Who it is for
- Pregnancies with an established due date.
- Version
- 1.0.0
Limitations
- An ultrasound in the first trimester is the most accurate way to date a pregnancy; if it differs from the LMP date, your clinician will use the ultrasound date.
References
- American College of Obstetricians and Gynecologists. Committee Opinion No. 700: Methods for Estimating the Due Date. Obstet Gynecol. 2017;129(5):e150–e154. doi:10.1097/AOG.0000000000002046