Enter the first day of your last period. We add 280 days (40 weeks) using Naegele’s Rule — the standard method used by healthcare providers worldwide.
If you know your exact conception date, enter it here. We add 266 days (38 weeks). Ideal for those who tracked ovulation or used fertility treatments.
Enter your ultrasound date and the gestational age from your report. First-trimester ultrasounds are accurate to within 3–5 days.
Your Due Date
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Current Week
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Trimester
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Days Until Due
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Medical Disclaimer
This calculator provides estimates for educational purposes only and does not
constitute medical advice. Due dates are estimates — only about 5% of babies
are born on their exact due date. Always consult your healthcare provider to
confirm your due date.
Read full disclaimer