It can be confusing at first to track a pregnancy. Women generally want to know:
- What is my pregnancy week number?
- In what month am I?
- Can you tell me when I’m due?
Pregnancy calculators make this easy. The first day of your last menstrual period (LMP) will provide you with the following information:
- Estimated due date
- Current pregnancy week
- Pregnancy month
- Trimester
- Development week-by-week
This method is often used by healthcare experts because it is accurate, simple, and works even before you have an ultrasound.
Pregnancy Calculator
Pregnancy Calculator – Weeks, Months & Due Date
Enter the first day of your last menstrual period (LMP) and your average cycle length. This tool will estimate your due date, pregnancy week, month and trimester.
⚠ This calculator is for educational use only and gives an estimate based on your LMP and cycle length. Always confirm your dates and medical information with a qualified healthcare professional.
How a Pregnancy Calculator Works
You can estimate your due date using Naegele’s Rule by:
- Your last menstrual period (LMP) will be 280 days (40 weeks) long.
Based on this, we can estimate:
- Your baby’s arrival date
- Pregnancy progress
- Key milestones
Calculate your pregnancy week—how many weeks are you pregnant?
Pregnancy weeks begin on the first day of your last period, not when you conceived. Taking a pregnancy test often reveals that a woman is already 4–5 weeks pregnant.
A pregnancy week calculator helps you determine:
- Your current week
- Remaining weeks
- Trimester
- Baby’s development stage
What Happens Every Week in the Pregnancy Calculator?
A simple overview:
Weeks 1–4
Development begins at an early age. There is an increase in hormones. There may be mild symptoms.
Weeks 5–8
Major organs begin to develop as the heartbeat forms.
Weeks 9–12
The first trimester ends; the baby’s features appear.
Weeks 13–16
The baby grows rapidly; you may feel more energetic.
Weeks 20–24
Around week 20, movement increases; an anatomy scan takes place.
Weeks 28–32
Weight gain; third-trimester symptoms appear.
Weeks 36–40
As soon as the baby is positioned, labor can begin.
Pregnancy Month Calculator – What Month Am I In?
| Month | Weeks |
|---|---|
| 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 37–40 |
