About this calculator
IVF Due Date Calculator does one thing: it turns an embryo transfer date into a due date and the milestones that follow it.
Why it exists
Most pregnancy due date calculators ask for the first day of your last menstrual period. After IVF that question is either unanswerable or actively misleading — your pregnancy did not begin with an ovulation anybody had to guess at. Putting an approximate period date into a general calculator produces an answer that can sit a week or more away from the one your clinic is working to, which is a needlessly stressful thing to discover at a scan.
This site exists so that the correct answer takes one step rather than a forum thread.
How it is built
The calculation runs entirely in your browser as plain arithmetic. There is no account, no sign-up, no email capture, and no server that ever receives your transfer date. Close the tab and nothing about your visit remains.
The dates follow standard obstetric convention — 266 days from conception, adjusted for how old the embryo was at transfer. The full method is set out on the calculator page.
Independence
This site is not affiliated with any fertility clinic, pharmaceutical company or fertility app, and it does not sell anything. It carries no advertising. It is a reference tool, and it is free.
Corrections
If you spot something inaccurate, or you are a clinician who would like to suggest a change to the wording, please get in touch. Corrections take priority over everything else.