Estimate your due date and how far along you are.
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Only a small share of babies arrive on the estimated date, and a normal pregnancy can end anywhere from about 37 to 42 weeks. This tool is an estimate, not medical advice. Your doctor or midwife may adjust the date after an ultrasound.
The most common way to estimate a due date is Naegele's rule: count 280 days, or 40 weeks, from the first day of the last menstrual period. If your cycle is longer or shorter than 28 days, the date is adjusted by the difference. If you know the date of conception, the due date is 266 days later. This calculator also shows how many weeks you have been pregnant today and the dates of common milestones. It is for general information only.
A due date is an estimate, and most babies arrive within a couple of weeks before or after it. An early ultrasound can date a pregnancy more accurately than the last period when cycles are irregular. Use the milestones as a guide and follow the checkup schedule recommended by your doctor or midwife.
It is an estimate. Few babies are born exactly on the date, and ultrasound may change it.
Your healthcare provider can date the pregnancy more accurately with an early ultrasound.