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Pregnancy Due Date Calculator
Naegele’s rule · Cycle Adjustment · Real-time
Select the first day of your last period.
28 days is typical. Adjust if your cycles vary.
Date used to calculate current gestational age.
Estimated Due Date
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Gestational Age
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Trimester
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Time Remaining
Progress to Due Date0%
Key Milestones
First Trimester Ends—
Gender Scan (approx)—
Viability—
Third Trimester Starts—
Full Term—
Due Date—
Estimates only. Not medical advice. Cycles < 21 or > 35 days may affect accuracy.
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Frequently Asked Questions
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.
What is LMP?
LMP stands for Last Menstrual Period. It refers to the very first day your last period started.
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.
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.