Pregnancy Due Date Calculator
Estimate your due date based on last menstrual period (LMP).
Frequently Asked Questions
How is my pregnancy due date calculated?
The standard method is based on the first day of your last menstrual period (LMP), adding 280 days (40 weeks) to that date.
How accurate is the estimated due date (EDD)?
It is an estimate. Only about 5% of babies are born on their exact due date; most arrive within a week before or after.
Does the tool show my current pregnancy week?
Yes, besides the due date, we calculate how many weeks and days pregnant you are currently and which trimester you are in.
What is the 'Conception Date'?
The tool can also estimate the date of conception, which typically occurs about two weeks after your LMP began.
Why does my doctor use a different due date?
Doctors may adjust the EDD based on early ultrasound measurements, which are more precise than LMP-based calculations.
Can I use this if I have an irregular cycle?
This tool assumes a standard 28-day cycle. If yours is significantly different, the EDD might vary by a few days.
What are the three trimesters?
First trimester (weeks 1-12), Second trimester (weeks 13-26), and Third trimester (weeks 27 until birth). Our tool shows your progress through these.
Is this tool a substitute for medical advice?
No, this is for informational purposes only. Always consult with your OB-GYN or midwife for official pregnancy monitoring.
Can I find my 'Age of Viability' here?
Our tool focuses on the due date and trimester milestones. Detailed medical milestones should be discussed with a professional.
Is the pregnancy calculator free to use?
Yes, it is 100% free and private. We do not store any personal health data on our servers.