Pregnancy Due Date Calculator
Estimate your expected due date and current gestational age from your last menstrual period (LMP). This tool is designed for planning and informational use and should be confirmed by your healthcare provider.
Calculate Pregnancy Due Date
Estimate your due date and gestational age based on the first day of your last menstrual period (LMP).
How to Use the Pregnancy Calculator
- Choose your LMP date: Select the first day of your last menstrual period from the calendar.
- Run the calculation: Click Calculate to estimate your due date and current gestational age.
- Review your results: Read the estimated due date and pregnancy age shown in weeks and days.
- Confirm with your clinician: Use this estimate as a planning reference and confirm details with your healthcare provider.
Pregnancy Timeline Reference
| Gestational Weeks | Trimester |
|---|---|
| Weeks 1-12 | First Trimester |
| Weeks 13-27 | Second Trimester |
| Weeks 28-40 | Third Trimester |
Frequently Asked Questions
How does this pregnancy calculator estimate due date?
It uses Naegele's rule, which adds 280 days (40 weeks) to the first day of your last menstrual period (LMP).
Is this due date exact?
No. It is an estimate. Actual delivery dates vary, and ultrasound findings or clinical assessment may adjust the expected due date.
What is gestational age?
Gestational age is the length of pregnancy measured from the first day of your last menstrual period, usually reported in weeks and days.
Should I rely only on this tool for medical decisions?
No. This calculator is informational and not a diagnosis. Please consult your healthcare provider for medical guidance.