How Do I Calculate Conception Date
Use this free how do i calculate conception date to estimate a due date and pregnancy weeks from a known conception date.
Health information notice: Results are estimates based on general formulas and may not reflect individual circumstances. This tool is not a diagnosis or substitute for personalized advice from a qualified healthcare professional.
How the how do i calculate conception date works
Due date = conception date + 266 days. The matching last-period date is about 14 days earlier, and pregnancy weeks are counted from that date.
Frequently asked questions
Why is pregnancy counted from the last period?
Because the last period is easier to date than conception, so doctors count 40 weeks from it.
Results are estimates for general information only. They are not a substitute for professional advice where applicable. Found a mistake? Report an error.