Due Date Calculator
Find your estimated due date and key pregnancy milestones.
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Calculate your estimated due date instantly — enter your last menstrual period, conception date, or ultrasound date to get your full pregnancy timeline with trimester dates and key milestones. Based on Naegele's rule, the standard method used by healthcare providers worldwide.
Frequently asked questions
How is a due date calculated?
Your estimated due date (EDD) is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is known as Naegele's rule and is the standard method used by doctors and midwives worldwide.
How accurate is a due date calculator?
Due date calculators provide an estimate. Only about 5% of babies are born on their exact EDD — most arrive within 1–2 weeks either side. An early ultrasound before 14 weeks gives the most accurate dating.
Can I calculate my due date from my conception date?
Yes. If you know your conception date, add 266 days (38 weeks) to get your estimated due date. This method is slightly more accurate when the exact conception date is known.
What is gestational age?
Gestational age is how far along your pregnancy is, counted from the first day of your last menstrual period — not from conception. A full-term pregnancy is 40 weeks of gestational age.