Trimester Calculator – Track Your Pregnancy Stages
Trimester & Due Date Calculator
Enter your Last Menstrual Period (LMP) to determine your full pregnancy timeline.
Calculate Your Dates
Summary
Calculated LMP:
Estimated Due Date (EDD)
Current Progress (Today)
Pregnancy Progress (40 Weeks)
0% Complete
Your Trimester Timeline
1st Trimester
Weeks 1 – 13
Dates:
Focus: Rapid cell division and formation of all major organs. Fatigue, nausea, and hormonal changes are common.
2nd Trimester
Weeks 14 – 27
Dates:
Focus: Often called the ‘Golden Trimester’ due to increased energy. The baby grows significantly, and you’ll likely feel movement (quickening).
3rd Trimester
Weeks 28 – 40
Dates:
Focus: Final growth and weight gain. Preparation for labor and birth. Discomfort, Braxton Hicks contractions, and frequent urination are typical.
Here is a list of trusted sites and specific pages relevant to pregnancy stages:
Centers for Disease Control and Prevention (CDC) – Pregnancy
The ultimate authority on health data in the US. They have specific pages on “During Pregnancy” and prenatal care.
Office on Women’s Health (Womenshealth.gov)
A US government site dedicated specifically to women’s health issues, offering very accessible guides on pregnancy stages.
National Health Service (NHS) – Pregnancy Guide
The UK’s health service provides excellent, easy-to-read week-by-week breakdowns.
The American College of Obstetricians and Gynecologists (ACOG)
This is the professional association for OB-GYNs. Linking here shows you are referencing the standards used by doctors.
Mayo Clinic – Pregnancy Week by Week : One of the most trusted hospital systems in the world; their content is reviewed by medical professionals.
Specifically has great resources on the stages of pregnancy (trimesters).
Planned Parenthood – Pregnancy :
Provides clear, non-judgmental information about pregnancy health and trimesters.