A due date calculator estimates when your baby is due, typically about 40 weeks from the first day of your last menstrual period plus the length of your cycle.
A due date calculator estimates when your baby is due, typically about 40 weeks from the first day of your last menstrual period plus the length of your cycle. Our pregnancy due date calculator is built on the same core pregnancy due date calculator when is my due date pregnancy calculator and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
Naegele's Rule for Due Date Calculation
Adds 280 days (40 weeks) to the first day of your last menstrual period (LMP), assuming a standard 28-day cycle.
Pregnancy Trimester Milestones
First Trimester: Weeks 1|13. Second Trimester: Weeks 14|27. Third Trimester: Weeks 28|40.
Conception Date vs. LMP Date
If your exact conception date or ovulation date is known (e.g. through IVF or ovulation tracking), add 266 days for the estimated due date.
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