Pregnancy Month Calculator by Weeks
Enter your current week of pregnancy to find out which month you are in.
Understanding Pregnancy Weeks and Months
Pregnancy is a remarkable journey, typically lasting around 40 weeks from the first day of your last menstrual period (LMP). While medical professionals and expectant parents often track pregnancy in weeks, many people also like to know which month of pregnancy they are in. This calculator helps bridge that gap, providing a quick conversion from weeks to months.
Why Weeks are Preferred in Medicine
Tracking pregnancy in weeks offers a more precise timeline for fetal development and maternal changes. Each week brings specific milestones, and medical guidelines for screenings, tests, and appointments are often based on gestational week. For instance, the first trimester typically ends around week 13, and the second trimester around week 26.
The Challenge of Converting Weeks to Months
Converting weeks to months isn't always straightforward because months don't perfectly divide into four-week segments. A typical month has about 4.33 weeks (365 days / 12 months / 7 days per week). This means that while the first few months might align closely with 4-week blocks, later months can span slightly more, leading to a total pregnancy of about 9 calendar months, but often referred to as 10 lunar months (each 4 weeks long).
Common Week-to-Month Mapping
Our calculator uses a widely accepted mapping to convert your current week of pregnancy into a corresponding month. This mapping helps provide a general understanding, though it's important to remember that these are approximations:
- Month 1: Weeks 1-4
- Month 2: Weeks 5-8
- Month 3: Weeks 9-12
- Month 4: Weeks 13-16
- Month 5: Weeks 17-20
- Month 6: Weeks 21-24
- Month 7: Weeks 25-28
- Month 8: Weeks 29-32
- Month 9: Weeks 33-36
- Month 10: Weeks 37-42 (Full term and beyond)
Example Scenarios:
- If you are 12 weeks pregnant, you are in Month 3.
- If you are 20 weeks pregnant, you are in Month 5.
- If you are 35 weeks pregnant, you are in Month 9.
Use this calculator as a helpful guide to better understand your pregnancy journey in terms of months, while always relying on your healthcare provider for precise medical information based on your gestational week.