IVF Success Rates: How to Read the Numbers You Are Quoted

It depends almost entirely on age and on what the percentage is a percentage of. The HFEA reported an average birth rate of 30% per embryo transferred across all patients in 2024.

Split by age, the same dataset gives 38% for patients aged 18 to 34 and 8% for patients aged 43 to 44. That spread is wider than any difference between clinics, which is worth holding onto when comparing them.

• 18–34: 38% per embryo transferred.
• All ages average: 30%.
• 43–44: 8%.
• The decline is continuous — there is no cliff year.

Age is the strongest single predictor in every published dataset, and no clinic can change it. A clinic serving younger patients will report better numbers without being better.

Mostly because they are measuring different things. The same underlying data produces very different headline figures depending on the denominator, and there is no requirement to use the flattering one or the honest one.

• Per embryo transferred — excludes cycles that never reached transfer.
• Per cycle started — includes canceled cycles, so it is lower.
• Per patient — counts people, not attempts; often the most useful.
• Cumulative across cycles — higher than any single-cycle figure.

A clinic quoting 55% and one quoting 30% may be performing identically. The first figure might be per transfer in patients under 35; the second per cycle started across all ages.

The question worth asking is not 'what is your success rate' but 'per what, for which patients, over what period'. A clinic that answers that clearly is telling you something; one that does not is telling you something else.

Comparing like with like is easier within one city than in the abstract. Our directory of fertility clinics in Bangalore scores each clinic on five weighted signals and states plainly which figures it could not verify, which is usually the more revealing half.

• After a Failed IVF Cycle: What Is Worth Investigating
• IUI vs IVF — Which Treatment Is Right for You? (2026)
• Best Age to Conceive: What the Data Says About Planning
• GnRH Antagonist vs Agonist Protocol — Which IVF Protocol, and Why (2026)
• Egg Freezing vs Embryo Freezing: How the Two Actually Differ
• Recurrent Implantation Failure: What the 2023 Definition Changed
• AMH Explained — What Your Result Means, and What It Does Not (2026)

It is usually the number that answers the question people are really asking. Most people want to know their chance of eventually having a baby, not their chance from one transfer.

Cumulative rates across several cycles are meaningfully higher than any single-cycle figure, because each additional attempt adds another chance. This is why a course of treatment is a more realistic unit than a cycle.

• Ask for cumulative live birth across three cycles, by age band.
• Ask how many patients that figure is based on.
• Ask whether it includes frozen transfers from the same retrieval.
• Beware figures based on very small numbers.

Our comparison of IUI and IVF covers how the two look different per cycle and much closer across a course of treatment — the same arithmetic in a different setting.

One caution on cumulative figures. They are only meaningful if the denominator stays fixed: everyone who started, including those who stopped after a failed cycle. A cumulative rate calculated only over patients who kept going will drift upward for reasons that have nothing to do with the clinic.

Dropout is common and rarely reflected in the numbers. People stop for cost, for the emotional toll, or because a clinician advised it, and every one of those departures makes the remaining figures look better.

Success rate marketing is where fertility advertising is least constrained, and several common claims do not survive contact with the data.

• A high clinic success rate does not mean a high rate for you.
• No add-on has been shown to raise live birth rates as routine treatment.
• A single-cycle figure is not your overall chance.
• Rates quoted without an age band or denominator are not informative.

Our article on PGT-A covers the most heavily marketed add-on, where ASRM's 2024 position is that the value as routine screening has not been demonstrated.

The realistic framing is that age sets the range, the number of attempts moves you within it, and clinic choice matters less than either — as long as the clinic is competent and honest about its figures.

That last condition is doing real work. Honesty about figures is itself a signal: a clinic willing to tell you its cumulative rate by age band, including the patients who stopped, is being straight with you about something it could easily obscure.

It is also worth asking what happens when a cycle fails — whether the clinic reviews and changes the protocol, or repeats it unchanged. Over a course of treatment that matters more to your outcome than the headline percentage that brought you through the door.