Enter your Last Menstrual Period Date, Conception Date, or ultrasound measurements like CRL or BPD into this Gestational Age Calculator, and it returns your Gestational Age, Current Trimester, Estimated Due Date, and Weeks Until Due Date.
Gestational Age
--
Gestational Age (Days)
--
Estimated Due Date
--
Current Trimester
--
Weeks Until Due Date
--
Gestational age calculated from LMP is accurate within 1-2 weeks for women with regular 28-day cycles. However, ultrasound dating in the first trimester is more accurate.
Gestational age is calculated from the last menstrual period and is about 2 weeks longer than fetal age. Fetal age (conception age) is the actual age of the developing baby from conception.
Ultrasound dating is most accurate in the first trimester (before 14 weeks) with crown-rump length measurements, accurate within 3-5 days.
A normal pregnancy lasts about 40 weeks (280 days) from the last menstrual period, or 38 weeks from conception. Full-term is considered 37-42 weeks.
First trimester: 0-13 weeks, Second trimester: 14-27 weeks, Third trimester: 28-40+ weeks. Each trimester has distinct developmental milestones.
Yes, gestational age can be estimated using ultrasound measurements like crown-rump length (CRL) or biparietal diameter (BPD), or from a known conception date.