There is no single correct number. The most-cited published estimates suggest roughly 14 to 15 mature eggs for about a 70% chance of one baby if you freeze in your early-to-mid 30s, and around 26 if you freeze at 38 to 40 (Doyle et al., 2016, as summarized by ASRM). ASRM’s own 2021 guideline says the evidence is still too thin to give women an exact target, so treat any number as an estimate built on one lab’s data, not a promise.
The numbers most clinics quote
When a clinic tells you to aim for “15 to 20 eggs,” it is usually drawing on a small set of published studies that estimate how often a single frozen egg becomes a baby. The two you will hear about most are a 2016 study by Doyle and colleagues at a large US program and a 2017 counseling model by Goldman and colleagues at Brigham and Women’s Hospital.
The American Society for Reproductive Medicine (ASRM) summarized the Doyle data in its 2021 guideline on outcomes after egg freezing. Those are the clearest published age-specific figures available:
| Age at freezing | Live birth per warmed egg | Mature eggs for ~70% chance of one live birth |
|---|---|---|
| Under 30 | 7.4% | Not separately reported in the ASRM summary |
| 30–34 | 7.0% | 14 |
| 35–37 | 6.5% | 15 |
| 38 and over | 5.2% | 26 (for ages 38–40) |
The Doyle cohort combined planned and medically indicated egg freezing. ASRM notes that the estimate for ages 41–42 in that study was unreliable because so few women were in the group. That matters: if you are over 40, nobody has a solid published egg-count target for you, and a clinic that quotes one with confidence should be asked where it comes from.
Why the published models disagree
Other data sets paint a much less optimistic picture. ASRM’s guideline also summarizes the HOPE registry (Nagy et al., 2017), which tracked women who froze eggs for planned (non-medical) reasons and later used them. There, the live birth rate was 23.8% for women under 35 and 12.0% for women 35 and older. ASRM also reports calculated per-egg live birth rates of 2.6% and 1.3% from a broader registry group that included donor cycles. ASRM points out that the registry’s “eggs needed per live birth” figures were calculated rather than observed.
The gap between 7% per egg and 2.6% per egg is not a typo. It comes from differences that also explain why two clinics may quote you different targets:
- Lab skill. Survival after warming and the share of eggs that fertilize and grow into blastocysts vary between labs. The Goldman authors explicitly say other centers should plug in their own blastocyst and thaw-survival rates.
- Who returns. Many women who freeze never come back, and those who do may thaw only part of their supply. Registry outcomes therefore reflect small, mixed groups.
- Mature versus total eggs. Most models count mature (MII) eggs. A retrieval of 15 eggs does not mean 15 frozen eggs, so ask which number your quote refers to.
- Era. Older data sets include slow-freezing methods; most labs now use vitrification.
How the Goldman counseling model works
The 2017 Goldman model (Human Reproduction) is the basis for several online egg-freezing calculators. It did not follow women who froze eggs and came back. Instead, it built a prediction from three ingredients:
- Fertilization and blastocyst rates by age, taken from 466 first fresh ICSI cycles in couples with male- or tubal-factor infertility, plus 54 donor-egg cycles.
- Euploidy rates by age, from 14,500 embryo genetic-testing results at an outside lab.
- Fixed assumptions: 95% of eggs survive warming for women under 36 and donors, 85% for women 36 and older, and a 60% live birth rate for each chromosomally normal blastocyst transferred.
The output is a probability of at least one, two or three live births for a given age and number of mature eggs. That makes it useful for one question in particular: does a second or third retrieval add much, or am I hitting diminishing returns? Its limitation is the one the authors state themselves: it is retrospective, built on assumptions, and may not match your clinic’s lab.
What actually changes your number
Age at freezing, not age at use
The single strongest factor in every data set is how old you were when the eggs were frozen. ASRM states that live birth rates per transfer are better when freezing happens at a younger age. An egg frozen at 32 keeps the chromosomal odds of a 32-year-old’s egg even if you use it at 42.
How many children you want
The targets above are for one live birth. If you hope for two children from frozen eggs, the number needed rises steeply, which is why the Goldman model reports odds for one, two and three births separately.
Your ovarian reserve
ASRM says ovarian reserve tests such as AMH and antral follicle count can estimate how many eggs a retrieval is likely to yield. They do not measure egg quality. A high AMH may mean you reach a target in one cycle; a low AMH may mean several cycles. Claims that supplements or diet can raise egg numbers are weak; LifeFertile reviews that evidence in its egg quality guide. Our guide to AMH, AFC and FSH results that disagree explains how clinics read these together.
Storage time
In donor-egg data reviewed by ASRM, storage up to 60 months showed no significant decline in egg quality. Longer storage has less published outcome data, but there is no strong evidence that time in the tank itself is the problem; age at freezing is.
Set a target from published data, then adjust it with your own retrieval results.
- Usually discussed when
- You are planning a first freezing cycle or deciding whether to do another one.
- Main upside
- A realistic target helps you budget for one, two or three cycles instead of assuming one is enough.
- Main tradeoff
- Every extra cycle adds cost, medication and time, and the published models cannot tell you exactly where your personal curve flattens.
A practical way to plan cycles
- Get your baseline. AMH, antral follicle count and a consult. Use our egg freezing readiness quiz to organize your questions first.
- Ask for the clinic’s own data. Thaw survival rate, fertilization rate and blastocyst rate for frozen eggs in your age group, and how many patients those rates are based on.
- Pick a target range, not a number. Use the published table as a starting point, then ask your doctor how your reserve changes it.
- Review after cycle one. Your first retrieval is the best predictor of your second. If you got far fewer mature eggs than expected, ask whether a protocol change makes sense before repeating.
- Price it as a series. Our egg freezing cost guide and 2026 cost breakdown list the line items, including storage, that add up across multiple cycles. Insurance and employer-benefit questions are covered in HowToHaveABaby’s 2026 egg freezing guide.
- When you say “eggs,” do you mean total retrieved or mature eggs frozen?
- What is your lab’s egg survival rate after warming, and for which age group?
- Which published model or calculator are you using for my target, and with what assumptions?
- Given my AMH and follicle count, how many retrievals do you expect it will take to reach that target?
- What happens if my first cycle yields far fewer mature eggs than expected?
- Do you recommend freezing embryos instead of, or as well as, eggs in my situation?
When embryos may be worth considering
If you have a partner or plan to use donor sperm, freezing embryos lets the lab show you how many eggs fertilized and reached the blastocyst stage, which is information egg freezing cannot give you up front. The trade-off is that it locks in a genetic pairing and creates consent questions if a relationship changes; our guide to what happens to embryos after divorce, separation or death covers those. For the overall process, start at our egg freezing hub, and read what retrieval day involves before your first cycle.
When to see a doctor: ASRM’s standard is a fertility evaluation after 12 months of trying if you are under 35, after 6 months if you are 35 or older, and sooner after 40 or with irregular cycles, known tubal or uterine problems, endometriosis or a partner with known sperm issues. Egg freezing is not a substitute for that evaluation if you are already trying.
Look at clinics in Colombia, too
Some patients compare accredited fertility clinics in Colombia for egg freezing. Ask any clinic for a written all-in quote (medications, monitoring, freezing and annual storage) and its own egg survival and blastocyst data for your age group before deciding.
Questions? Message us on WhatsApp and we’ll point you to clinics and next steps. We may earn referral fees from partner clinics.
Frequently asked questions
Is 10 eggs enough to freeze?
It depends on your age and goals. In the Doyle data summarized by ASRM, about 14 mature eggs gave women aged 30 to 34 roughly a 70% chance of one live birth, so 10 mature eggs gives a lower but still meaningful chance. At 38 and older the published estimates are considerably lower per egg.
Do eggs frozen at 35 work as well as eggs frozen at 30?
Slightly less well on average. ASRM reports live birth per warmed egg of 7.0% at 30 to 34 and 6.5% at 35 to 37 in the Doyle data. The bigger drop in the published estimates comes after 38.
Why does my clinic recommend a different number than an online calculator?
Calculators use fixed assumptions about thaw survival and embryo development. Your clinic may use its own lab results and your ovarian reserve, which can move the target up or down. Ask which assumptions each number is based on.
How long can frozen eggs be stored?
In donor-egg data reviewed by ASRM, storage up to 60 months showed no significant decline in egg quality. Age at the time of freezing matters much more than storage time.
Should I freeze eggs after 40?
Some clinics offer it, but ASRM notes that published estimates for ages 41 to 42 were unreliable because of small numbers. Ask for realistic, age-specific data and discuss alternatives such as embryo freezing or donor eggs.
Sources & guidance
- ASRM Practice Committee: Evidence-based outcomes after oocyte cryopreservation for donor oocyte IVF and planned oocyte cryopreservation, a guideline (2021). Summarizes Doyle et al. 2016 and Nagy et al. 2017.
- Goldman RH et al. Predicting the likelihood of live birth for elective oocyte cryopreservation: a counseling tool for physicians and patients. Hum Reprod. 2017;32(4):853-859. doi:10.1093/humrep/dex008
- ASRM: Fertility evaluation of infertile women, a committee opinion (2021)