Due Date Calculator
Jenzzy applies Naegele's rule (LMP + 280 days) for a standard pregnancy timeline estimate.
Inputs
Results
Enter values to see results.
Formula
Due date = LMP + 280 days (40 weeks)
Assumes a 28-day cycle with ovulation on day 14; ultrasound dating may differ.
Example
- Add 280 days: Jan 15 + 40 weeks
- Due date: Oct 22, 2026= Oct 22, 2026
Result: Estimated due date October 22, 2026
Frequently Asked Questions
Irregular cycles?
Early ultrasound dating is more accurate.
Only ~5% on due date?
Normal term is 37–42 weeks.
IVF?
Use embryo transfer date plus gestational age offset.