Calculate Your Dates
Your Pregnancy Timeline
You are 12 weeks pregnant
Key Milestones
About Pregnancy Calculator
How it Works
Our calculator uses the first day of your last menstrual period (LMP) to estimate your conception date, due date, and current pregnancy progress.
Accuracy
This tool provides an estimate based on a 28-day cycle. For irregular cycles, consult your healthcare provider.
Important Note
This calculator is for informational purposes only. Always consult with your doctor for medical advice regarding your pregnancy.
Pregnancy Timeline
(0-13 weeks)
(14-27 weeks)
(28-40 weeks)
Pregnancy Conception Calculator
Our Pregnancy Conception Calculator is a free, easy-to-use tool designed to help expectant parents track their pregnancy journey. By entering the first day of your last menstrual period or your estimated due date, our calculator provides valuable insights into your pregnancy timeline.
How Does the Pregnancy Calculator Work?
Pregnancy is typically calculated as 40 weeks (280 days) from the first day of your last menstrual period (LMP). This calculator uses that information to determine:
- Conception date: Estimated date when fertilization likely occurred (about 11-21 days after LMP)
- Due date: Estimated date of delivery (40 weeks from LMP)
- Current pregnancy week: How far along you are in your pregnancy
- Trimester: Current stage of pregnancy (first, second, or third trimester)
Why Use Our Pregnancy Calculator?
Understanding your pregnancy timeline helps you prepare for each stage of fetal development, schedule prenatal appointments, and plan for your baby's arrival. Our tool provides:
- Instant, accurate calculations based on medical standards
- A visual pregnancy progress tracker
- Important milestone dates throughout your pregnancy
- Trimester information to understand your baby's development stage
Frequently Asked Questions
How accurate is the conception date?
The conception date is an estimate based on a typical 28-day menstrual cycle. Actual conception may vary based on your unique cycle length and ovulation patterns.
Can I use this calculator if I have irregular periods?
While you can still use it, results may be less accurate. For irregular cycles, an ultrasound dating scan provides the most accurate due date estimation.
What's the difference between gestational age and fetal age?
Gestational age is measured from the first day of your LMP, while fetal age (also called embryonic age) starts at conception. Gestational age is approximately two weeks ahead of fetal age.
How often should I recalculate my pregnancy dates?
Recalculate whenever you receive new information from your healthcare provider. Early ultrasounds may provide a more accurate due date than LMP-based calculations.
Note: This tool is for informational purposes only. Always consult your healthcare provider for medical advice regarding your pregnancy.