Your estimated chances with frozen eggs
Based on your age when your eggs were frozen and the number of mature eggs you have stored, here's what published fertility research suggests.
Model used: Goldman et al. (2017)
Chance of having at least one child
Estimated probability of at least one live birth using your frozen eggs.
Chance of having at least two children
Estimated probability of two or more live births using your frozen eggs.
Chance of having at least three children
Estimated probability of three or more live births using your frozen eggs.
Your family planning goal
You selected a goal of 1 child. Based on Goldman et al. (2017), your estimated probability of having at least 1 child is 83%.
Estimated euploid embryos
2.8
Average number of chromosomally normal (euploid) blastocysts expected from 15 mature frozen eggs, using the thaw-survival, blastocyst and euploidy rates in Goldman et al. (2017). This is a statistical average, not a predicted count of your actual embryos.
Your results are estimates based on population-level data, not a prediction of your individual fertility outcome.
Your fertility journey deserves support. What if your employer could help?
Egg freezing, embryo freezing and other fertility treatments can involve substantial costs. Employer support could make access to care easier. Zoyra is developing a fertility and family-building benefit for workplaces. Tell us where you work and we will take the conversation from there.
Understanding your chances can help you plan. Employer support could help make fertility care more accessible.
There's no obligation, and suggesting Zoyra doesn't mean your employer has committed to offering the benefit.
Not sure how many eggs you might retrieve?
If you're considering egg freezing but haven't started treatment yet, you can explore how many eggs might be retrieved during one stimulation cycle using your age, AMH level and optional Antral Follicle Count (AFC).
Try our Egg Retrieval CalculatorIllustrative clinical pathway - actual laboratory outcomes vary.
From frozen eggs to a potential baby
Not every frozen egg will survive thawing, fertilise or develop into an embryo. Understanding these stages can help explain why the number of mature eggs matters.
- 1
Mature frozen eggs
15The mature (MII) eggs you entered above.
- 2
Eggs surviving thaw
About 14Spring Fertility reports around 92% of vitrified eggs survive warming.
- 3
Fertilised eggs
Surviving eggs are usually fertilised by ICSI. We do not show a number here because we have no independently sourced fertilisation rate for this model.
- 4
Blastocyst-stage embryos
About 4.3Spring Fertility reports 31% of successfully warmed eggs reach blastocyst at this age at freezing.
- 5
Estimated chromosomally normal (euploid) embryos
Some blastocysts have the expected number of chromosomes. The share falls with age. We do not show a number because no age-specific euploidy table is sourced here.
- 6
Potential live-birth outcomes
Spring Fertility reports a 63% live-birth rate per transfer of a euploid embryo. See the main results above for overall estimates.
Values are statistical expectations from Spring Fertility clinical figures (92% thaw survival, 63% live birth per euploid transfer), not predicted actual numbers. This educational pathway comes from a different clinical dataset with different assumptions from the main Goldman et al. (2017) results above, which assume 95% thaw survival under 36, 85% from 36, and 60% live birth per transferred euploid blastocyst. The two are never combined, and the euploid embryo estimate in the main results comes only from Goldman.
How many mature eggs might you need to freeze?
Explore approximately how many mature eggs may be associated with different probabilities of having one or more children, based on published statistical models.
Your age when the eggs would be or were frozen.
Desired number of children
Desired probability
Model: Goldman et al. (2017).
Based on the selected statistical model, approximately 11 mature eggs would be associated with a 70% estimated probability of having at least one child.
This estimate is for planning and educational purposes only. It is not a medical recommendation about how many eggs you should freeze.
How does the number of frozen eggs affect your chances?
Explore how estimated probabilities change with different numbers of mature frozen eggs.
Age at freezing 35 · Goldman et al. (2017)
More eggs raise the estimated probability, but no number of eggs guarantees a live birth.
How does our Frozen Egg Success Calculator work?
Why age at freezing matters
Egg quality declines with age, mainly because the share of eggs with chromosomal abnormalities rises. A frozen egg keeps the quality it had on the day it was frozen, so the age at freezing is what counts.
Why mature eggs, not total eggs retrieved
Only mature (MII) eggs can be fertilised. Research models are based on mature eggs, so entering the total retrieved would overestimate your chances.
Warming, fertilisation and embryo development
When you decide to use your eggs, they are warmed. Most vitrified eggs survive. Surviving eggs are usually fertilised by ICSI, where a single sperm is injected into each egg. Fertilised eggs are cultured for five to seven days, and some reach the blastocyst stage.
What euploid embryos are
A euploid embryo has the expected 46 chromosomes. Euploid embryos are more likely to implant and lead to a live birth. The share of euploid embryos falls as age at freezing rises.
Why live birth is different from fertilisation or pregnancy
Fertilisation and a positive pregnancy test are early steps. Some pregnancies end in miscarriage, so live birth is the most meaningful outcome and the one these models estimate.
Our main model: Goldman et al. (2017)
The main results use the counselling model published by Goldman et al. in Human Reproduction (2017). For each mature frozen egg it multiplies four published steps: the chance of surviving thaw (95% under 36, 85% from 36), the chance of reaching blastocyst (exp(2.8043 − 0.1112 × age), with ages 35 and under treated as 35, as in the paper), the age-specific chance that a blastocyst is euploid (57.4% at 35 and under, falling to 12.7% at 44), and a 60% live-birth rate per euploid embryo transfer.
The estimated euploid embryo count is the number of eggs multiplied by the first three steps. Goldman publishes data up to age 44. For age 45 we use the Cobo et al. "over 40" estimate instead, and say so next to the result. Figures from different studies are never combined in one calculation. Doyle, Cobo and Spring Fertility remain available as optional comparisons.
How probabilities are calculated
Each mature egg is treated as having a small, age-dependent chance p of leading to a live birth. With n eggs, the chance of at least one live birth is:
P(X ≥ 1) = 1 − (1 − p)n
For two or more children we use the general binomial formula:
P(X ≥ k) = 1 − Σj=0..k−1 C(n, j) · pj · (1 − p)n−j
This is a simplified statistical model. It assumes each egg's outcome is independent, and it does not capture every clinical factor or the correlation between outcomes within one patient. It does not predict an individual's exact chances.
Why results vary between clinics
Laboratory techniques, patient groups and how outcomes are counted differ. This is why clinic-specific figures, such as Spring Fertility's, can be quite different from research averages.
Why statistical models cannot predict individual outcomes
Population averages describe large groups. Your own chances depend on factors these models do not include, such as your egg quality, sperm quality, the uterus and your medical history.
Research model inputs
Doyle et al. (2016)
Original research
- Under 308.2%
- 30-348.0%
- 35-377.3%
- 38-404.5%
- 41-422.5%
Primary reference model. Published estimates cover ages at freezing up to 42.
Cobo et al.
Original research
- Under 356.6%
- 36-376.1%
- 38-395.6%
- Over 401.8%
The published summary leaves ages 35 and 40 ambiguous, so no estimate is shown for those ages.
Spring Fertility clinical estimates
Clinic-specific data
- Under 3016.9%
- 3016.7%
- 3115.9%
- 3215.7%
- 3315.4%
- 3415.4%
- 3513.0%
- 3612.6%
- 3711.9%
- 3810.0%
- 3910.0%
- 408.7%
- Over 403.0%
Spring Fertility clinical estimates - outcomes may differ at other clinics. Not general population rates.
References
- Doyle et al. (2016), Fertility and Sterility. Original research: per-egg live-birth efficiency by age at retrieval. Optional comparison.
- Goldman et al. (2017), Human Reproduction. Original research: live-birth probability by age at freezing and number of mature eggs. Our primary model.
- Goldman et al. (2017), Human Reproduction. Original research: a predictive model for live birth from vitrified eggs by age and egg number. Background reading.
- Cobo et al. (2016), Fertility and Sterility. Original research: outcomes of elective egg vitrification by age group.
- Spring Fertility Egg Calculator and clinical methodology. Clinic-specific data from one US clinic.
- Onto Health fertility calculators. Third-party interpretation of published research.
Zoyra is an independent platform and is not affiliated with the research institutions or fertility clinics referenced in this calculator. This calculator has not been clinically validated.
Frequently asked questions about frozen eggs
Planning for your future starts with understanding your options.
Understanding your fertility options is only one part of planning for the future. From comparing fertility clinics to exploring treatment costs and planning how to pay for care, Zoyra helps make fertility decisions more informed and accessible.
Whether you're considering freezing your eggs or exploring fertility treatment, we're here to help you understand your choices and take the next step with confidence.
Wondering how many frozen eggs you might need to have a baby in the future?
Whether you're considering egg freezing or have already frozen your eggs, understanding your chances of future success can help you make more informed decisions about your fertility.
Our Frozen Egg Success Calculator uses published fertility research and statistical models to estimate your chances of having one or more children based on your age at the time of freezing and the number of mature eggs frozen.
Explore your estimated success rates, compare different scenarios and gain a clearer picture of what your frozen eggs could mean for your future family.