Pregnancy Calculator
Our free pregnancy calculator provides a complete pregnancy timeline based on your last menstrual period (LMP), a known due date, or a conception date. Instantly find your estimated due date, current gestational week, trimester, and key pregnancy milestone dates — all in one place.
Pregnancy is a 40-week journey divided into three trimesters. Knowing your exact gestational age and key dates helps you prepare for prenatal appointments, understand developmental stages, and plan for your baby’s arrival. This pregnancy calculator is designed for expectant parents in the USA and Canada.
🤰 Pregnancy Calculator
🤰 Pregnancy Timeline
This calculator provides estimates based on a standard 40-week pregnancy and 28-day cycle. Due dates can vary. Always consult your OB-GYN or midwife for accurate prenatal care.
How to Use the Pregnancy Calculator
To get your pregnancy timeline, follow these steps:
- Select your calculation method — Last Menstrual Period, Known Due Date, or Conception Date.
- Enter the corresponding date.
- Click Calculate Pregnancy to see your due date, gestational age, trimester, and key milestone dates.
When Should You Use a Pregnancy Calculator?
Use the pregnancy calculator as soon as you receive a positive pregnancy test to establish your due date and gestational age. In particular, knowing your gestational age helps your doctor schedule appropriate prenatal tests at the right times — such as the first trimester screening (10–13 weeks) and the anatomy scan (18–20 weeks).
Furthermore, the pregnancy calculator is useful throughout pregnancy to track your progress through each trimester and countdown the days until your due date. Additionally, it helps you plan practical matters such as maternity leave, baby shower timing, and nursery preparation.
Pregnancy Tips for a Healthy Journey
Here are important tips for a healthy pregnancy in the USA and Canada:
- Start prenatal vitamins early — Folic acid is critical in the first weeks of pregnancy, ideally before conception. Look for a prenatal vitamin with at least 400–800 mcg of folic acid.
- Attend all prenatal appointments — Regular checkups allow your healthcare provider to monitor your baby's growth and catch any concerns early.
- Stay active — Moderate exercise during pregnancy is safe for most women and has been shown to reduce discomfort and improve mood.
- Eat a balanced diet — Focus on protein, iron, calcium, omega-3 fatty acids, and folate.
- Know your maternity leave rights — In the USA, FMLA provides up to 12 weeks of unpaid leave. In Canada, EI parental benefits offer up to 18 months of combined leave.
Frequently Asked Questions About the Pregnancy Calculator
How is a due date calculated?
A due date is calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP), assuming a standard 28-day cycle. This is known as Naegele’s Rule.
What are the three trimesters of pregnancy?
The first trimester is weeks 1–13, the second trimester is weeks 14–26, and the third trimester is weeks 27–40. Each trimester brings distinct developmental milestones and physical changes.
How accurate is a due date?
A due date is an estimate. Only about 5% of babies are born on their exact due date. Most births occur within two weeks before or after the estimated due date.
Related Calculators
Furthermore, you might find these related tools useful: Due Date Calculator — Pregnancy Conception Calculator
Disclaimer: This pregnancy calculator provides estimates based on standard 40-week gestational periods. Always consult your OB-GYN or midwife for accurate prenatal care and due date confirmation.