Pregnancy Due Date Calculator
Naegele's rule is the standard method doctors use for a first due-date estimate, based on the first day of your last menstrual period.
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How this works
Due date = LMP + 280 days (40 weeks). This assumes a regular 28-day cycle; your doctor's dating ultrasound may adjust this.
Medical disclaimer
This tool provides general health information based on published formulas and guidelines. It is not a medical diagnosis and does not replace advice from a qualified doctor. If you have a health concern, please consult a physician or book a consultation on IMCURE.
Frequently asked questions
Why might my doctor give a different date?
An early ultrasound measures the foetus directly and is considered more accurate than LMP-based dating, especially for irregular cycles.
