calculators• Health
Pregnancy Due Date & Gestational Calculator
Track the countdown to meeting your baby. Using Naegele's Rule, compute your estimated delivery date (EDD), current fetal gestational age in weeks and days, and trimester milestone progression.
Health calculations run 100% locally in browser memory.
Conception & LMP Input
Default standard cycle is 28 days.
Estimated Delivery Date (EDD)
October 22, 2026
Current Progress:Week 35, Day 4
Trimester:Trimester 3 of 3
Estimated Conception:Jan 29, 2026
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How to Use Pregnancy Due Date & Conception Calculator
1
Enter First Day of LMP
Select the starting date of your last menstrual period.
2
Adjust Cycle Length
Enter your typical menstrual cycle length (default: 28 days).
3
View Milestones
Inspect your calculated due date, current gestational week, and conception date.
About Pregnancy Due Date & Conception Calculator
Adds 280 days (40 weeks) to the first day of the last menstrual period, correcting for cycle variance using the difference from a standard 28-day cycle.
Operational Limits
- •Only ~5% of babies are born on their exact due date; most arrive between 37 and 42 weeks
Key Features
- Naegele's clinical rule adjusted for custom menstrual cycle length
- Calculates Estimated Delivery Date (EDD) and approximate conception date
- Tracks current gestational age in exact Weeks and Days
- Displays Trimester 1, 2, or 3 clinical milestone indicators
- 100% private and secure on-device calculation
Frequently Asked Questions
Due dates are clinical estimates. Ultrasound dating scans during the 8-12 week window provide additional fetal biometry accuracy.