IVF success and prediction

Estimates of outcome. Every one of these gives a range rather than a single figure, because that is what the data supports.

Example answer1.5 normal embryos expectedFrom 4 blastocysts · 38% eachHow many of my embryos may be normal?You need: Age at egg retrieval, Blastocysts availableOpen calculator →
Example answer28% per cycleThen 63% after 3 cycles, 86% after 6What are my chances, using my test results?You need: Your age, AMH, Antral follicle count, Previous failed cyclesOpen calculator →
Example answer48% chance per transferDonor 26, recipient 42What are my chances with donor eggs?You need: Donor age, Recipient ageOpen calculator →
Example answer35% chance per transferAge 34 · about 1 in 3What are my chances with IVF?You need: Your ageOpen calculator →
Example answer73% after 3 transfersAbout 35% each timeHow many IVF cycles might I need?You need: Your age, Number of transfersOpen calculator →

Why every honest estimate is a range

Prediction models exist and are useful, but they describe groups. Two people with identical inputs routinely have different outcomes, and no model sees ovarian response, embryo quality, or the partner’s results — the things that matter most.

The other reason to distrust single figures: clinics quote different things. Per cycle started versus per transfer, one cycle versus cumulative, all patients versus your age band. Ask specifically for live birth per cycle started, for your age band, with the number of cycles behind it.