Pregnancy Due Date Calculator

Calculate your pregnancy due date, current week, and trimester with our accurate online pregnancy calculator.

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About This Tool

Our comprehensive pregnancy calculator helps you determine your estimated due date, current pregnancy week, trimester, and key milestones. You can calculate based on your last menstrual period (LMP), conception date, or ultrasound date. The tool provides accurate results using standard medical calculation methods and displays a detailed pregnancy timeline with important developmental stages.

Save your calculation history with a free account

How to Use

Select your calculation method: Last Menstrual Period, Conception Date, or Ultrasound Date
Enter the required date information
Optionally adjust your average cycle length (default is 28 days)
Click 'Calculate Pregnancy Dates' to see your results
View your estimated due date, current pregnancy week, trimester, and key milestones

Frequently Asked Questions

Find Quick Answers

How accurate is the pregnancy due date calculation?

The calculator uses standard medical formulas and is accurate for regular cycles. However, individual variations can occur, so always consult with your healthcare provider for confirmation.

What's the difference between LMP and conception date calculations?

LMP (Last Menstrual Period) calculation adds 280 days (40 weeks) from the first day of your last period. Conception date calculation adds 266 days (38 weeks) from the estimated conception date. Most healthcare providers use LMP for initial dating.

Can I use this calculator if I have irregular cycles?

Yes, but you may need to adjust the cycle length parameter. For irregular cycles, ultrasound dating is typically more accurate.

What pregnancy milestones are included in the results?

The calculator shows key milestones including the end of first trimester (week 13), viability week (week 24), and full term (week 37-42).

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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