Pregnancy Calculator - Estimate Due Date
Calculate your estimated due date (EDD) quickly and privately. Our free Pregnancy Calculator uses standard medical formulas to track your pregnancy milestones entirely within your browser.
What is the Pregnancy Calculator?
Knowing when to expect your baby helps you plan medical checkups, maternity leave, and nursery preparations. This Pregnancy Calculator relies on Naegele's rule—the standard calculation used by obstetricians worldwide—to estimate your due date based on the first day of your last menstrual period (LMP) and your average cycle length. Because pregnancy data is incredibly personal, we built this tool to operate exclusively via client-side JavaScript. Your dates and health metrics are never sent to a server, guaranteeing your family planning remains strictly confidential.
Why Use Our Pregnancy Calculator?
- Medical Standard: Uses the universally accepted Naegele's rule for estimation.
- Cycle Adjustment: Customize your average cycle length for more accurate results.
- 100% Private: Your dates are never logged, tracked, or uploaded.
- Milestone Tracking: Get a breakdown of your current trimester and weeks remaining.
How to Use the Pregnancy Calculator
Select the first day of your last menstrual period (LMP) using the calendar.
Adjust the cycle length slider if your cycle is longer or shorter than 28 days.
Click Calculate to instantly generate your Estimated Due Date (EDD).
Review the trimester milestones breakdown below.
Frequently Asked Questions
The EDD is a strong estimate; however, only about 5% of babies are born exactly on their due date. Most are born within two weeks before or after.
Absolutely not. The calculations happen entirely in your local browser. We collect zero data.
No. This tool is for informational purposes only. An ultrasound scan performed by a medical professional provides the most accurate due date.
All file processing is performed locally in your web browser. We do not upload, store, or view your data.