A quick disclaimer
Zoyra's Egg Retrieval Calculator is intended for educational and informational purposes only. It uses a published statistical model to estimate the potential number of eggs retrieved during ovarian stimulation.
The calculator is not a personalised medical assessment and cannot predict your individual response with certainty. Actual outcomes depend on several factors, including your medical history, stimulation protocol, ovarian response and treatment decisions.
The model is based on a limited research population and may not accurately represent every patient or fertility clinic. It does not predict how many mature eggs will be frozen or your chances of pregnancy or live birth.
We recommend consulting a qualified fertility specialist for personalised advice about ovarian stimulation, egg freezing and your individual treatment options.
Your estimated egg retrieval result
Enter your details above and select "Calculate my estimate" to see your result.
These figures are research-based estimates, not a prediction of your individual egg retrieval 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 how many eggs you might retrieve is one step. Planning how to afford treatment is another.
There's no obligation, and suggesting Zoyra doesn't mean your employer has committed to offering the benefit.
What affects the number of eggs retrieved?
Several factors shape how the ovaries respond to stimulation. None of them, alone or together, can tell you exactly how many eggs you will have collected.
Anti-Müllerian Hormone (AMH)
AMH is produced by small growing follicles in the ovaries. Higher levels generally reflect a larger pool of follicles that can respond to stimulation, which is why AMH is one of the most widely used markers for predicting ovarian response. Results can vary between laboratories and test kits.
Antral Follicle Count (AFC)
AFC is counted on a transvaginal ultrasound scan, usually early in the cycle, by adding up the small follicles (typically 2 to 10 mm) seen in both ovaries. It gives a direct view of follicles available that month, but counts can vary between scans and between sonographers.
Age and ovarian ageing
The number of eggs in the ovaries declines with age. The equations used here include an age term, but age on its own is a weak predictor of how many eggs an individual will have retrieved. AMH and AFC carry more information about response.
Stimulation medication and protocols
The type and dose of medication, the protocol used and how treatment is monitored and adjusted all influence the number of eggs collected. These decisions are made by your clinical team, and this calculator does not account for them.
Individual variation
Two people with the same age, AMH and AFC can have very different results. Medical history, body weight, genetics and conditions such as PCOS or endometriosis can all affect response.
AMH does not measure egg quality
AMH reflects the quantity of follicles, not whether the eggs inside them are healthy. Egg quality is more closely linked to age at the time of retrieval.
Retrieved eggs versus mature eggs
Not every retrieved egg is mature (MII). Only mature eggs are usually frozen, so the number frozen is often lower than the number retrieved.
The ESHRE ovarian stimulation guideline describes AMH and AFC as useful for predicting high or low ovarian response. Neither marker predicts the probability of pregnancy or live birth.
How many of those eggs could lead to a baby?
The number of eggs retrieved is only one part of the fertility journey. Not every retrieved egg will be mature or suitable for freezing. If you already know how many mature eggs you have frozen, you can explore research-based estimates of your future live-birth probabilities.
Explore frozen egg success ratesHow does our Egg Retrieval Calculator work?
The calculator uses Moon KY et al. (2016), "Nomogram to predict the number of oocytes retrieved in controlled ovarian stimulation", published in Clinical and Experimental Reproductive Medicine. The authors analysed 141 stimulated IVF cycles at a university hospital in South Korea and built regression models that predict the number of oocytes retrieved from ovarian reserve markers.
Each equation predicts the natural logarithm of the number of oocytes retrieved. We convert this to an egg count using the exponential function, then round to the nearest whole egg for display while keeping full precision internally. AMH entered in pmol/L is converted to ng/mL (dividing by 7.14) before any calculation.
When you provide AFC, the calculator switches to Model 3, which uses additional information. This is an alternative published model, not a validated personalised improvement for every patient.
The equations we use
Model 1: ln(N) = 3.21 − 0.036 × age + 0.089 × AMH
Model 3: ln(N) = 2.32 − 0.017 × age + 0.039 × AMH + 0.03 × AFC
N = exp(ln N)
- The underlying study analysed 141 stimulated IVF cycles and excluded certain patient groups, including women diagnosed with polycystic ovary syndrome (PCOS), endometriosis and several other medical conditions. The models may not adequately represent patients with these conditions or those following different treatment protocols. Further external validation is needed to establish their reliability across broader populations.
- Observed study ranges: ages 26 to 49 and AMH 0.08 to 17.25 ng/mL. Values outside these ranges are flagged as extrapolations. Being inside them does not mean a prediction has been validated for an individual. The AFC caution above 40 is a conservative Zoyra threshold, not a study limit.
- Results may not generalise to other populations, elective egg freezing or different stimulation protocols.
- A modelled value is an average expectation for people like those in the study. Observed outcomes for individuals vary widely around it.
- No individual prediction is guaranteed, and we do not show a prediction interval because the data needed to calculate one is not available.
- The tool does not estimate mature eggs, embryos, pregnancy or live birth.
- Different medication types, doses and protocols can change the number of eggs collected.
- Zoyra has not clinically validated this model. We do not claim endorsement by ESHRE or by the study's authors.
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Frequently asked questions
Understand your options. Plan your next steps.
Whether you're exploring egg freezing, comparing fertility clinics or planning for treatment costs, Zoyra helps you understand your options and make more informed decisions about fertility care.
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