Pregnancy Due Date Calculator
NEWEnter the first day of your last period to estimate your due date. For information only, not medical advice.
How to use Pregnancy Due Date Calculator
This is an estimate based on a standard 28-day cycle and Naegele's rule. Actual due dates vary — for information only, not medical advice.
- Enter the first day of your last menstrual period.
- Your estimated due date is calculated automatically.
Frequently asked questions
How is the due date calculated?
Using Naegele's rule — adding 280 days (40 weeks) to the first day of your last menstrual period. This is the standard method used by most pregnancy calculators and many clinicians for an initial estimate.
How accurate is this estimate?
It assumes a standard 28-day cycle with ovulation on day 14. If your cycle is longer or shorter, your actual due date could differ — an ultrasound-based estimate from your doctor is more accurate, especially for irregular cycles.
How is my trimester determined?
Based on your current gestational age in weeks: 1st trimester is up to week 13, 2nd trimester is weeks 14–27, and 3rd trimester is week 28 onward.
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