Pregnancy Calculator
A pregnancy calculator is a simple yet incredibly helpful tool designed to guide expecting parents through one of life’s most exciting journeys. By using details like the first day of your last menstrual period or conception date, it estimates your due date and tracks how far along you are in your pregnancy. This not only helps you prepare mentally and physically but also gives you a clearer picture of your baby’s growth week by week. Whether you’re newly pregnant or just planning, a pregnancy calculator offers reassurance, clarity, and a sense of connection as you follow each milestone leading up to your baby’s arrival.
Pregnancy Due Date Calculator
Estimate your due date, pregnancy week & trimester in seconds.
Most common method — used by most OB/GYNs worldwide.
Use this if you know the exact date of conception.
Enter your EDD from your doctor to see your current week.
Pregnancy at a Glance
First Trimester (Weeks 1–13)
Major organ development. Morning sickness common. First prenatal visit recommended.
Second Trimester (Weeks 14–26)
Baby’s movements felt. Anatomy scan around week 20. Energy often returns.
Third Trimester (Weeks 27–40)
Rapid baby weight gain. Hospital bag prep. Weekly OB visits near the end.
Full Term
39–40 weeks is full term. Babies can arrive 2 weeks before or after EDD.
Q: Is a pregnancy calculator accurate?
A: Pregnancy calculators are accurate within a general range. Based on the LMP method, results are reliable for women with regular 28-day cycles. The most accurate dating method is a first-trimester ultrasound (weeks 8–12), which uses fetal measurements. Our calculator adjusts for non-standard cycle lengths to improve accuracy.
Q: How do I calculate my pregnancy due date?
A: To calculate your pregnancy due date, take the first day of your last menstrual period (LMP) and add 280 days (40 weeks). This is called Naegele’s Rule and is used by OB/GYNs worldwide. Our free pregnancy calculator on Fit-and-Care.com does this automatically—just enter your LMP date and click calculate.
Q: What is a normal due date range?
A: A normal due date range is 37 to 42 weeks of gestation. Babies born at 39–40 weeks are considered full term. Only about 5% of babies arrive on their exact calculated due date; most arrive within two weeks before or after.
Q: What if my due date changes after an ultrasound?
A: It’s completely normal for your due date to be updated after your first ultrasound. First-trimester ultrasounds (weeks 8–12) are the gold standard for pregnancy dating. If the ultrasound-based EDD differs from your LMP-based EDD by more than 7 days, your OB may revise your official due date.
Q: How is gestational age different from fetal age?
A: Gestational age is measured from the first day of your last menstrual period and is the standard used by doctors. Fetal age is measured from the actual date of conception, which is typically about 2 weeks less than gestational age. Our calculator uses gestational age, consistent with international medical standards.