About Conception Date Calculator
Estimate the probable conception date window based on your due date or LMP.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
Conception Date = Due Date - 266 days (38 weeks)
Example Calculation
For an October 15 due date, conception likely took place around January 22.
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.