Free · Browser-Based · Pregnancy Timeline

Conception Date Calculator

Estimate a likely conception date from due date, birth date, or last menstrual period using simple date-based pregnancy timing assumptions.

Mode

Reference date

Cycle length (days for LMP mode)

Timeline note

Conception summary

🎯 Common Use Cases

Estimate likely conception timing

Back-calculate pregnancy timeline

Check relationship between due date and conception

Review date ranges for planning

Does this provide an exact conception date?

No. It provides a likely estimate using standard pregnancy timing assumptions.

Which mode should I use?

Use the date you already know best: due date, birth date, or LMP.

Does it stay local?

Yes. Your dates are processed in the browser only.