Pregnancy Due Date Calculator
Naegele’s rule • Cycle Adjustment • Real‑time
Inputs
Pregnancy Report
Estimated Due Date
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Gestational Age
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Trimester
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Time Remaining
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Key Milestones
Pregnancy Due Date Guide
How It Works
This calculator estimates your Expected Delivery Date (EDD) based on the first day of your Last Menstrual Period (LMP). It follows the standard medical rule of adding 280 days to your LMP.
Example Calculation
Calculation if the first day of your last period was Jan 1, 2024:
Benefits & Use Cases
Medical Planning
Schedule prenatal checkups and key ultrasounds at the right gestational weeks.
Preparation
Plan your maternity leave, baby shower, and hospital bag packing timeline.
Track Progress
Know exactly which trimester you are in and follow your baby’s weekly development.
Frequently Asked Questions
Q1: Is this calculator 100% accurate?
No, it provides an estimate. Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks before or after.
Q2: What is LMP?
LMP stands for Last Menstrual Period. It refers to the very first day your last period started.
Q3: Can an ultrasound change my due date?
Yes. Early ultrasounds (dating scans) are often more accurate than LMP calculations and your doctor may revise your date based on the baby’s size.
Q4: Is 40 weeks the standard?
Yes, a full-term pregnancy is considered 40 weeks. However, anything from 37 to 42 weeks is generally considered a healthy delivery window.