Pregnancy Due Date Calculator
Estimate your baby’s due date, gestational age, current trimester, and key pregnancy milestones using Naegele’s Rule.
What is Pregnancy Due Date Calculator?
The Pregnancy Due Date Calculator computes your estimated date of delivery (EDD), current gestational age (weeks and days), and trimester schedule based on your Last Menstrual Period (LMP) or exact conception date. Utilizing clinical obstetric standards (Naegele's rule), all calculations occur 100% locally in your browser with complete privacy.
Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.
How to Use the Pregnancy Due Date Calculator
- 1Select your calculation method: "First Day of Last Period (LMP)" or "Conception Date".
- 2Enter the corresponding date using the date picker.
- 3If using LMP, adjust your average menstrual cycle length (default is 28 days).
- 4Review your estimated due date (EDD), current gestational week/day, trimester timeline, and countdown.
Formula & Calculation Logic
Applies standard obstetric Naegele's rule, adding 40 gestational weeks (280 days) from the first day of the last menstrual period, with an automatic day-for-day adjustment for menstrual cycles shorter or longer than 28 days.
EDD = LMP + 280 Days + (Cycle_Length - 28 Days) | Conception_EDD = Conception_Date + 266 DaysPregnancy Due Date Calculator Frequently Asked Questions
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