Free Pregnancy Due Date Calculator Online
Estimate your due date, current week, and pregnancy milestones
Complete Pregnancy Tracking
Due date, weekly progress, and milestone tracking in one tool
Calculate your estimated due date using the standard Naegele method adjusted for your personal cycle length.
See exactly which week of pregnancy you are in and what percentage of the journey is complete.
View important pregnancy milestones and trimester dates so you know what to expect and when.
About This Tool
This calculator estimates a due date and current gestational age, conventionally counted from the first day of the last menstrual period. The standard estimate adds 280 days (40 weeks) to that date, a method known as Naegele's rule, which assumes a regular 28-day cycle.
The result is an estimate: only about one birth in twenty happens on the predicted date, and full term spans roughly 37 to 42 weeks. Cycle length and other factors shift the real date, so the figure is a planning guide, not a medical determination. Always confirm dating with a healthcare provider.
Because the estimate assumes a regular cycle, it can be off when cycles are longer, shorter, or irregular, which is why early ultrasound dating often adjusts it. Treat the due date as the centre of a range spanning several weeks rather than a fixed appointment, and confirm it with a clinician.
How to Use It
- Enter the first day of your last menstrual period.
- Read the estimated due date and how many weeks along you are.
- Use the estimate for planning, and confirm it with a clinician.
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